Length of queue LSI 3108 VSAN

Similar Questions

• Thread length of queue count in negative and too many Thread waiting

  We use Weblogic server 9.2.2 with 1 admin server and managed server 4. Currently, in one of the servers, I saw that there is about 77 waiting threads.
  
  
  Home > summary of the servers > server1 > surveillance > discussions > autoréglant Thread Pool
  
  I could see that the "length of the queue' is negative (-138) and auto tuning sleep thread count is 77. Large number of threads WAITING thread persists during the busy time of the times while other servers is fully used.
  
  
  Is it normal to have the length of the queue that is negative and so many threads on HOLD? With regard to the JMS queue negative oracle had already recognized this is a bug. Thank you.
  
  Published by: 855849 on May 1st, 2011 07:19
  
  Published by: SilverHawk may 12, 2011 08:12

  Is it normal to have the length of the queue that is negative

  No, it is not normal. Looks like probably a bug

• AMQP queue length

  I would like to create a simple script that returns the length of all the queues defined AMQP broker given.  Is there a method to get a length of queue AMQP via AMQP Plugin VCO?

  Thank you

  Management and monitoring are not part of the AMQP standard. It's so they are not part of the plugin. However, all providers provide a kind of management or supervision of the API. If you use RabbitMQ you activate the plugin management as described in http://www.rabbitmq.com/management.html.

  Then, you can use the HTTP-REST query api endpoint served by the management plugin (http://hg.rabbitmq.com/rabbitmq-management/raw-file/rabbitmq_v2_8_2/priv/www/api/index.html) plug-in

• Display the length of the queue of CPU

  We are currently troubleshooting problem in our environment, and a step which was recommend is to check the length of queue CPU to our guests.  Unfortunately, I do not know how to do this in ESX 4i.  Can anyone help by explaining the steps to access this information?

  Hello Andrea, just connect to your server via ssh esxi or use the direct console (DCUI), in which case you use the DCUI by pressing alt + F1 which will open the shell it will look like this:

  

  In case you don't use esxi 4.1 that you enter not 'supported '.

  Once you are in the shell, follow this procedure:

  step 1-. Enter the command: esxtop

  step 2-. Press the letter 'c' (it will change your point of view to CPU stats).

  

  step 3-. Once you are on the view of stas CPU hit the 'V' (capital V) which will filter your cpu stats just for vm (process) worlds.

  

  the % RDY is the length of the queue for the processor (means that vm waiting to be programmed on a procesor/core). in this way, you can check the length of queue of cpu on your virtual machines, to the previous view (view CPU), you can check the % RDY for system services.

  Kind regards.

  If you find this information useful, please give points to "correct" / "useful."

  My blog virtualizacion you en idioma

• Sluggish Qosmio F60 with Office 2007

  Hello world

  I have a new Qosmio F60 (i7, 4 GB of RAM, 1 GB graphics GT330) running Windows 7 Home Premium (64-bit).

  It works fine, but when I have a document open in Microsoft Word 2007, the computer runs very slow, with long delays, for example when switching between applications with alt - tab or by clicking on the taskbar at the bottom. It only seems to happen when I first just open word (ie. with "Document1"), but once I open another file or type text, it slows down to a crawl. I opened these documents without any problem on another computer. Word itself isn't slow when that happens, but around switching and do things like moving files in windows Explorer are very tedious.

  Initially, I had a 32-bit version of Home premium installed, but this would freeze every hour or so, then reloaded the 64-bit home premium since the partition of hard drive recovery.

  Any ideas on the reasons of the computer is so laggy? Don't think that I needed a PC range to be able to type a word document, and open a web browser at the same time...

  Kind regards
  Dennis

  Unfortunately, I have two problems that you can watch in... but no solutions!

  First of all, your likely Nvidia graphics card suffers the Nvidia powermizer DPC latency problems that cause the slower the computer each time changes on the GPU clock speed. NVIDIA claims to have solved the problem, but we don't see until they release their next regular update. Hope that Toshiba makes the driver available as soon as its ready! You can find a lot more people with the problem of Nvidia in the Satellite A series forum:

  http://forums.computers.Toshiba-Europe.com/forums/thread.jspa?threadID=49337&TSTART=0

  Second, is a huge problem with hard disk queue length. You will find that your computer runs lightning fast of complex calculations, but slows to a crawl, every time that you run simple programs that spend a lot of time communicating with the hard drive... as an office. Try opening the Windows - resource monitor task manager and look at the length of queue disk when your computer slows down. Anything above 2 indicates a bottleneck between CPU and hard drive (my disk queue length happens occasionally when 10 multitasking!). I don't know if this is related to the Nvidia problem or if there is another reason why communicating with the hard drive is so slow. The Toshiba satellite that I use for work does not suffer from this problem and has the same type of hard disk (even if a smaller size). Furthermore, you have the 640 GB HDD?

  If you find that you don't have the problem of disk queue length, make sure that you call the assistance of Toshiba on this topic. Most people report, the better chance we all have to fix!

• Ran Diagnostic Report/average line of the disc is 2

  About 2 weeks ago, I upgraded my Vista laptop to 1 GB. It works perfectly, but I ran a Diagnostic report and it showed in the information Section that average disk queue length was 1. I did a defragment disks and changed it to 2, but I still get the same message informtional, now with 2 instead of 1.

  Should I do something else because it works well? The only change I noticed is that I had to close it with the button yesterday because the screen was grey long after many updates of Windows. He opens normally today and made a few configuration. I got scared when I saw the screen after seeing some comments on a Blue Screen of Death or something like that, but I'm sure it was gray not only blue.

  Thank you

  AG

  Hi Ana,

  Length of queue Disk Avg... This counter is in fact closely related to the % disk time counter. This counter converts a decimal value to the % disk time and displays. This counter will be necessary at the time where the disk configuration employs several controllers for several physical disks. In these cases, the overall performance of the disk IO system, which consists of two controllers, could exceed that of an individual disk. So, if you look at the % disk time counter, you would see only a value of 100%, which represent the total potential of the entire system, but only that he had reached the potential of a single record on a single controller. The actual value may be at 120%, which displays the Avg. disk queue length counter. 1.2.

  The tab disk in the resource monitor (Start - Run - Resmon, or just the button resource monitor in the performance of the Task Manager tab) will show the disk of process activity to help understand this specific process is causing so much disk activity.

  For reference:

  The monitoring queue length

  http://TechNet.Microsoft.com/en-us/library/cc938625.aspx

  I suggest you send the request to the Forum here to improve the assistance on the issue:

  http://social.technet.Microsoft.com/forums/en-us/categories

  Let us know if you have other questions about Windows in the future. We will be happy to help you.

• 5.8.1 infrastructure cartridge - create rule for 'availablePagingSpace '?

  I have a number of AIX systems monitored by using the cartridge of the Infrastructure.  I copied and modified the rules for the CPU, the ability to file systems and memory.

  I need to create a rule to alert on 'availablePagingSpace' that appears on the chart "Memory usage" when I click on the "Paging Space" graph via the Host Monitor dashboard.

  I'm assuming that I could copy the rule "Utilziation memory" and likely the condition to test insteead 'availablePagingSpace' of the 'use '.   This seems to be a false assumption.  When you use the rule condition query interface, these are the errors I get.

  com.quest.nitro.service.sl.interfaces.scripting.ScriptingException: com.quest.nitro.service.sl.interfaces.scripting.ScriptMalformedQueryException: bad request: java.lang.IllegalArgumentException: Type ' foglight - 5:Memory:8' doesn't have a property with the name "availablePagingSpace" - start of the script - #availablePagingSpace #.< 100="" ----="" script="" end="">

  I tried to change the rule definition to use different topologies, such as "ICAGENT", but I can't seem to find this property available anywhere.

  I'm still a bit of a newbie to the rule editing Foglight, so bear with me.  If someone has a pointer in the right direction for me on how to access the "availablePagingSpace" metric, so I can use in my terms of rule, I would be very grateful.

  Thank you!

  GWL-

  Hello

  Please try this on a local Foglight Server first.

  When you look at the gauge for swap space available in the dashboard you can see that it is actually taken from the host itself

  

  If the scope of the rule should be the host itself, not memory.

  The easiest way is to seek a similar rule with the host as the scope.

  If you copy the rule run the length of queue for example, you can see that the scope of the rule is host.
  You can then change the rule condition to and when you use the condition Editor, you can see the metric of availablepagingspace as part of the host

  

  I hope this helps...

  Golan

• Rules and infrastructure register settings

  Probably a very stupid question: when it comes to the Infrastructue rules and registry settings, they are global, in other words, the INF_RunQueueLengthWarning would fire for a window Windows and Unix.

  Hi Ann -.

  A few parts to my answer.

  Inf_RunQueueLengthWarning is a registry Variable. By default, its value is simply a global constant. However

  You can add registry values which means that the value of the variable can change based on the specific topology

  types or objects (you can find more about this by searching the registry values to edocs.quest.com). Out of the box

  This registry Variable has no registry value, so it's just a constant.

  This registry Variable can be used in different rules. These rules may be specific or General in scope in scope.

  In this case, I see that this registry variable is used out of the box in the rule to run the length of queue, whose scope

  is: host: hostType! = null and hostType.name = 'physical '.

  This means that this rule should fire against any physical host, regardless of the operating system, and that the threshold of the area warning of the rule is this registry variable.

  I hope this helps.

  Robert

• USB random sectioning and low power after Windows Update

  I had a problem on my Windows 7 to USB disconnected randomly and my cell phone could not get enough power to recharge, this week, I formatted my way of thinking cell phones that could be related software.

  At first it worked fine, USB not disconnect not even my phone loaded without problems.

  Then, I made the update of Windows install SP1, after that everything is gone back as it was, constant disconnections and low power on the USB key.

  I already change the selective suspension of USB registered false on each USB input in the Manager of peripheral and disabled "Windows can turn off this device to save power".

  When it detects Ok on the phone, it shows that the use of 500mA, then he loses the connection and reconnect as unknown device and use of unknown power.

  Another thing is that the often external HARD drive it freezes, when I use the performance monitor shows the current length of queue disk frozen with a value greater than 1,000.

  Anyone know which alter KBs feature USB? Or how to get back the old functions?

  My laptop is 2010 updated with the latest drivers from HP.

  Hi, I tried something that apparently solved the problem.

  Instead of removing just the USB drivers, I removed everything about USB, my edge Broadcom Bluetooth, Wi - Fi on board... because they use this interface.

  After Windows again every single sensor, including the drivers of USB hub, I had no problem of disconnection or power.

  In any case as soon as I can I'll try upgrading to Windows 8.

  If I have gives me more problems I'll answer here.

  Thanks for the support.

• Windows 7 64 - bit, GA-970-a-DS3P, slow SATA 3 HD and USB 2.0 also issues

  Let me start this way:

  Material:

  Motherboard: GA-970-a-DS3P

  (1) WD Caviar Black HD: 3 amendments of 1 TB each. One for the OS, one for applications and one for Swap. (Don't ask how I ended up with this config: it's a long story of upgrade).

  (2) graph GTX 550 Ti card.

  (3) AMD Phenom x 4 965 BE: all 4 cores unlocked. DO NOT overclocked.

  (4) RAM DDr3 8 GB (2 sticks)

  (5) rest include 1 SATA DVD drive, Cooler Master monstrous fins CPU cooler (which cuts my fingers twice) and a power supply 650W (Cooler Master)

  Software:

  (1) Windows 7 64 bit ultimate (new installation)

  (2) MS Office 2010

  (3) Acronis True Image 2012

  (4) cloud of Creative adobe: Adobe Acrobat Pro XI

  The ORGANIC parameters:

  a value of 1) all SATA AHCI.

  (2) active xHCI. (no idea)

  (3) active eHCI. (no idea)

  Drivers:

  1st install Gigabyte SATA AHCI and USB 3.0 drivers drivers. All keyboard & mouse drivers are from Gigabyte.

  2nd configuration (after that I discovered that it was slow death): DriverMax provided SATA 3.0 AHCI drivers.

  Windows start up the GUI login screen in 40 to 43 seconds after the POST.  (Used to make less than 30 seconds before I installed MS Office).

  Problem and diagnoses that I made:

  (1) primary HD is extremely slow to respond. It takes just an inordinate amount of time to respond to the high activity of HD. (Like when I try to copy a large file on the C drive or read from drive C).

  (2) I used Perfmon.exe to monitor disk queue length and % disk time Avg. Length of queue disk on drive C starts from 0.117 and amounts to 24,26 within 20 minutes once I started. % disk time is high at 118.98 or even above.

  (3) surprisingly a USB 3.0 flash drive has reported a speed of 118 MB/s on a copy of a file of 3.4 GB D USB 3.0 drive

  (4) USB 2.0 reported avg 28 MB per second, which was expected.

  (5) after that I removed the drivers from Gigabyte SATA, I used one of Drivermax (don't know what it was).  Yes, I remove the old drivers, rebooted and then installed drivers drivermax.

  (6) disk queue length dropped to 0.28 on average when copying to and from the drive C and even under heavy operations.

  (7) Windows experience index stays at 5.9 for HD primary.

  (8) Avg speed of drive C is now about 128 to 132 MB/second (seriously?)

  (9) I don't find the exclamation points or question marks in Device Manager.

  (10) now, since yesterday, the speed has dropped again down (no updated driver, but the critical Windows updates made). Avg disk queue length again increased slowly to about 24.23.

  (11) what I did a chkdsk c: R, but could not find any errors of surface HD.

  (12) I am past controller cables and plugged in the different plugs (which cut on sharp edges of the graphics card and the fins of the cooler: why HW manufacturers can soften the edges: they will lose money?).

  (13) USB 2.0 speed has dropped drastically to 7,28 MB/second copy about 1 GB of multiple files of 12 MB each.

  Am at the end of my rope on this.

  Can I have a very problematic motherboard? Have I not dumb drivers? Or I did something wrong here?

  Any help to fix this problem of speed appreciated.

  P.S. The system is also catchy and fast with start-up less than 45 seconds, even times with connected devices. Opening apps are fast and load system (also long that I do not touch the C drive) are faster.

  Thanks in advance

  I misinterpreted the word 'no'... :-)

  Clone of the boot drive on the disk used for the page file after removing the partition on the drive of page file as in reduce to unallocated space. Your current boot drive is perhaps not the strongest of its kind.

  It can be done with the help of Aomei partition Wizard, free for home use.

  http://www.aomeitech.com/aomei-partition-Assistant.html

  If the computer seems to be ok, stop the execution of the performance monitoring software. It can drive a person crazy. Glance for other stuff that can slow the system down...

• DAVID tail Drops

  We have a POS 155 Mbps circuit.

  There are tail drops that occur on the default class that is allocated 25% (38,75 Mbps). There is a part of the voice traffic, but it is the priority in queue and is not a problem. Other control classes also OK.

  But when I look at the overall use of the physical interface (155 Mbps), it isn't cluttered. It peaks at 40 percent during the opening hours - which most is the default class.

  It was my understanding that DAVID should not "kick in" unless there is congestion - such as defined by the WRED algorithm.

  "Congestion" here applies to the physical interface or is it worth the 25% allocated without traffic?

  If the tail drops are produced due to "congestion" on the class by default, what settings should I change - queue lengths or the bandwidth allocated by default?

  eth-service-policy policy-map
  voice of the class
  percentage of priority 35
  voice command class
  2% of bandwidth
  Network-class control
  percentage of bandwidth 5
  class class by default
    25% of bandwidth
  random detection

  Policy-map frame-relay-form-policy
  class class by default
  average of form 154000000
  Service-eth-service-policy

  POS1/0 interface
  Description «...» »
  no ip address
  encapsulation frame-relay
  No keepalive
  No arp frame relay
  no relay inverse-arp frame
  frame-relay-form-exit of service-policy policy
  waiting-1000 on

  show policy-map interface POS1/0

  POS1/0

  Out of service-policy: frame-relay-form-policy

  Class-map: default class (all football match)
  1802709602 package, 720560400569 bytes
  5 minutes offered rate 26898000 bps, lower rate 0 bps
  Match: all
  Traffic Shaping
  Target/average byte support excess increment interval
  Rate limit bits/int bits/int (ms) (bytes)
  154000000/154000000 962500 3850000 3850000 25 481250

  Adapt the queue packets bytes packet shaping
  Active depth delayed deferred Active
  -0 1802673602 3259356776 79971 71426633 not

  Service policy: eth-service-policy

  Class-map: default class (all football match)
  1405375819 package, 644742811187 bytes
  5 minutes offered rate 24889000 bps, lower rate 0 bps
  Match: all
  Queues
  The output queue: Conversation 267
  Bandwidth 25 (%)
  Bandwidth 38500 (Kbps)
  (correspondence pkts matched / bytes) 94915/108733008
  (depth/total drops/No.-buffer drops) 36015/0/0
  exponential weight: 9
  average queue depth: 0

  class transmitted random drop tail drop brand Maximum Minimum
  pkts pkts, bytes, pkts, bytes beat beat the prob
  0 1405364393/644719714663 4793657/4024 31991/36714190 20 40 1/10
  1 25378/1116693 0/0 0/0 22 40 1 / 10
  2 175 / 7736 0/0 0/0 24 40 1 / 10
  3       0/0               0/0              0/0           26      40  1/10
  4       0/0               0/0              0/0           28      40  1/10
  5       0/0               0/0              0/0           30      40  1/10
  6       0/0               0/0              0/0           32      40  1/10
  7       0/0               0/0              0/0           34      40  1/10
  RSVP 0/0 0/0 0/0 36 40 1 / 10

  Packet drop counters increment when I controlled from one day to the next, and we have graphs that show random and drops of tail.

  

  Thank you (in anticipation).

  Hello, Craig.

  Here is the minimum and maximum thresholds that you have on the class by default WRED. That you run fast enough connection with many users, the traffic must be burst, and queue average of 20/40 packages is not enough!

  100M link I would say to have thresholds at least 200 to 300 packages (or even more) respectively; the size of the queue on 400-500.

  Best regards.

  PS: forced to queue length just queues delay and buffers available; I guess in your case, only delay queues would come into play... up to 300 packs * 500 bytes * 10/150 M = 1/100 sec = 10 ms (in the worst cases).

• Metric of Exchange interactions

  I created a map of heat for the Exchange to show "use / overall length of queue of discount (all queues) sorted by DC.» Works perfectly.

  However when I heat map interfact to get feedback from a tree of health, he told me "no data available" for any reason.

  Ago, the heatmap does not play well as a receiving widget. It was added as a feature for 5.8.2, but for a 'specific' use cases. In general, you won't find a lot of workflow where it will be useful to you.

• Very bad performance on a virtual machine

  Hi all

  I've got 2 x 5.1.0 ESXi hosts (733933) in my environment connected to a starwind iSCSI data store that has SSD in a RAID array. It's very fast because we never had performance issues.

  The data in question store contains several virtual machines. Virtual machines are as quick as you wait, except for one. It is very slow, and I can't nail why (IOMeter test below).

  I tried these techniques to understand:

  1. Run IOmeter several moments of the day to ensure that it is not a process on the VM problem asking the questions
  2. Length of queue disk supervised the VM problem to ensure that it is not too busy
  3. Provided all the parameters of virtual equipment of the VM (type of controller disk, CPU, RAM) problem
  4. Installed a new VM on this data store to eliminate the data store as a cause of the performance issue
  5. Checked the allocation of shares of the VM problem to make sure it is not pushed to the side under heavy load

  I don't see anything that can cause this problem, someone at - it ideas?

  The performance test:

  Just a thought that we had something like that a long time ago... I was sure it was the storage that it ended up being the memory and CPU on the virtual machine limit.  You would see really bad performance on the wise vm storage, but the real problem was the vm limit causing storage I/O queue time.   I would look in the settings of the virtual machine and look at reservation / limit.   Do not forget that even a reservation does not override the limit.

  If you do not have a limit attempt to set a reserve for all CPU / memory and then test again.   If it fails again there is something really wrong with the I/O stack on your Windows OS virtual machine.  (You should also try to vmotion it in another data store)

  If you know how to use ESXTOP you can quickly find information on your problem using the m, c and v keys.

  I would like to know what you find.

• PerfMon statement drive dramatic increase in access to Oracle starting times

  Hello
  
  My Oracle 10 g (10.2.0.4) server is hosted on a windows 2003 server.
  The data files are stored on a disk RAID1 on a dedicated partition array: currently 30 free concerts on 180, that shouldn't be a concern unless I am mistaken, because the data files have been created in the form of 10 GB of files with no automatic growth. I add a new data file whenever I need more space for my tables (alerts when 80% used).
  
  Since 2 days I feel a loss of theatrical representation:
  The EM console reports nothing special (no alarm storage-related) outside the need for a more paged memory.
  I have a reorg when segmentation Adviser suggests.
  My the optimizer statistics are calculated by the default scheduled task.
  
  The strange thing I noticed is that as soon as I start the database, there is a huge disk activity increase even if no request at all is submitted to the database.
  PerfMon reports current length of queue of > 1000 disc and disc > 3000 ms access time
  
  CPU is 2% of the activity on the 4-CPU server.
  I have a lot of spare memory (currently 3 used on the 16 GB).
  
  It is a server dev for ETL processes, there is very little simultaneous connections.
  
  Any suggestion is welcome.
  
  AWR report is available here
  http://min.us/mqnXQhd5Z
  
  Published by: user10799939 on March 22, 2012 09:30

  
  Cache Sizes
  ~~~~~~~~~~~                       Begin        End
                               ---------- ----------
                 Buffer Cache:     1,296M     1,296M  Std Block Size:         8K
             Shared Pool Size:       160M       160M      Log Buffer:    14,364K 
  
  Load Profile
  ~~~~~~~~~~~~                            Per Second       Per Transaction
                                     ---------------       ---------------
                    Redo size:            460,955.72 ;         2,477,358.63
                Logical reads:              3,392.16 ;            18,230.80
                Block changes:              6,451.93 ;            34,675.22
               Physical reads:                  2.92 ;                15.67
              Physical writes:                394.52 ;             2,120.28
                   User calls:                  1.69 ;                 9.08
                       Parses:                  3.31 ;                17.81
                  Hard parses:                  0.17 ;                 0.90
                        Sorts:                  1.32 ;                 7.09
                       Logons:                  0.06 ;                 0.31
                     Executes:                  7.01 ;                37.68
                 Transactions:                  0.19 
  
    % Blocks changed per Read:  190.20 ;   Recursive Call %:    96.23
  Rollback per transaction %:    0.30 ;      Rows per Sort:    14.41 
  
  Instance Efficiency Percentages (Target 100%)
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
              Buffer Nowait %:   99.98 ;      Redo NoWait %:   99.86
              Buffer  Hit   %:   99.92 ;   In-memory Sort %:  100.00
              Library Hit   %:   96.30 ;       Soft Parse %:   94.96
           Execute to Parse %:   52.74 ;        Latch Hit %:   99.07
  Parse CPU to Parse Elapsd %:    0.35 ;    % Non-Parse CPU:   99.30 
  
  Shared Pool Statistics        Begin    End
                                ------  ------
               Memory Usage %:   75.48 ;  75.51
      % SQL with executions>1:   79.92 ;  85.03
    % Memory for SQL w/exec>1:   77.07 ;  70.09 
  
  Top 5 Timed Events                                         Avg %Total
  ~~~~~~~~~~~~~~~~~~                                        wait   Call
  Event                                 Waits    Time (s)   (ms)   Time Wait Class
  ------------------------------ ------------ ----------- ------ ------ ----------
  db file sequential read               9,052      17,688   1954   51.3 ;  User I/O
  log file switch (checkpoint in        5,303       4,649    877   13.5 Configurat
  log file switch completion            4,245       4,023    948   11.7 Configurat
  wait for a undo record               32,393       3,531    109   10.3 ;     Other
  db file parallel write               18,771       3,437    183   10.0 System I/O 
  

  haven't seen as much waiting on average. For example, 877ms for "log file switch" is above the threshold. And other events waiting too...

  
  Time Model Statistics                DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
  -> Total time in database user-calls (DB Time): 34446.5s
  -> Statistics including the word "background" measure background process
     time, and so do not contribute to the DB time statistic
  -> Ordered by % or DB time desc, Statistic name 
  
  Statistic Name                                       Time (s) % of DB Time
  ------------------------------------------ ------------------ ------------
  sql execute elapsed time                              4,008.5 ;        11.6
  parse time elapsed                                      352.9 ;         1.0
  hard parse elapsed time                                 352.7 ;         1.0
  PL/SQL compilation elapsed time                         120.1 ;          .3
  DB CPU                                                   61.8 ;          .2
  failed parse elapsed time                                21.3 ;          .1
  PL/SQL execution elapsed time                             8.0 ;          .0
  connection management call elapsed time                   0.0 ;          .0
  hard parse (sharing criteria) elapsed time                0.0 ;          .0
  repeated bind elapsed time                                0.0 ;          .0
  hard parse (bind mismatch) elapsed time                   0.0 ;          .0
  DB time                                              34,446.5 ;         N/A
  background elapsed time                              14,889.7 ;         N/A
  background cpu time                                      39.0 ;         N/A
            ------------------------------------------------------------- 
  
  Wait Class                            DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
  -> s  - second
  -> cs - centisecond -     100th of a second
  -> ms - millisecond -    1000th of a second
  -> us - microsecond - 1000000th of a second
  -> ordered by wait time desc, waits desc 
  
                                                                    Avg
                                         %Time       Total Wait    wait     Waits
  Wait Class                      Waits  -outs         Time (s)    (ms)      /txn
  -------------------- ---------------- ------ ---------------- ------- ---------
  User I/O                       10,515     .1           17,785    1691      15.8
  Configuration                  10,186   79.5 ;           8,865     870      15.3
  System I/O                     27,619     .0            8,774     318      41.6
  Other                          57,768   98.3 ;           6,915     120      87.0
  Commit                          2,634   88.6 ;           2,481     942       4.0
  Concurrency                     2,847   75.4 ;           2,240     787       4.3
  Application                       219    2.3 ;              23     105       0.3
  Network                         4,790     .0                0       0       7.2
            ------------------------------------------------------------- 
  

  once seen it yet, there is an expectation very strong user IO

  
  Wait Events                          DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
  -> s  - second
  -> cs - centisecond -     100th of a second
  -> ms - millisecond -    1000th of a second
  -> us - microsecond - 1000000th of a second
  -> ordered by wait time desc, waits desc (idle events last) 
  
                                                                     Avg
                                               %Time  Total Wait    wait     Waits
  Event                                 Waits  -outs    Time (s)    (ms)      /txn
  ---------------------------- -------------- ------ ----------- ------- ---------
  db file sequential read               9,052     .0      17,688    1954      13.6
  log file switch (checkpoint           5,303   78.0 ;      4,649     877       8.0
  log file switch completion            4,245   89.2 ;      4,023     948       6.4
  wait for a undo record               32,393   99.8 ;      3,531     109      48.8
  db file parallel write               18,771     .0       3,437     183      28.3
  wait for stopper event to be         24,203   99.8 ;      2,634     109      36.5
  log file sync                         2,634   88.6 ;      2,481     942       4.0
  control file sequential read          7,356     .0       2,431     330      11.1
  buffer busy waits                     2,513   83.1 ;      2,173     865       3.8
  log file parallel write                 520     .0       1,566    3012       0.8
  control file parallel write             840     .0       1,334    1588       1.3
  rdbms ipc reply                         172   91.3 ;        330    1916       0.3
  enq: CF - contention                    309   23.0 ;        268     867       0.5
  log buffer space                        638   28.5 ;        192     301       1.0
  enq: PS - contention                     52   23.1 ;         71    1362       0.1
  db file scattered read                  113     .0          67     590       0.2
  os thread startup                        76   77.6 ;         63     834       0.1
  reliable message                         57   78.9 ;         50     878       0.1
  enq: RO - fast object reuse              22   22.7 ;         23    1038       0.0
  latch free                              537     .0          16      30       0.8
  Streams AQ: qmn coordinator               3  100.0 ;         15    5005       0.0 
  

  Overrides

  
  Background Wait Events               DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
  -> ordered by wait time desc, waits desc (idle events last) 
  
                                                                     Avg
                                               %Time  Total Wait    wait     Waits
  Event                                 Waits  -outs    Time (s)    (ms)      /txn
  ---------------------------- -------------- ------ ----------- ------- ---------
  db file parallel write               18,772     .0       3,437     183      28.3
  events in waitclass Other            24,367   99.5 ;      3,010     124      36.7
  control file sequential read          6,654     .0       2,333     351      10.0
  log file parallel write                 520     .0       1,566    3012       0.8
  control file parallel write             840     .0       1,334    1588       1.3
  buffer busy waits                       899   94.2 ;        884     984       1.4
  log file switch (checkpoint             206   82.0 ;        185     898       0.3
  os thread startup                        76   77.6 ;         63     834       0.1
  log file switch completion               46   93.5 ;         45     982       0.1
  log buffer space                        158   31.0 ;         12      77       0.2
  db file sequential read                  62     .0           7     111       0.1
  db file scattered read                   20     .0           6     318       0.0
  direct path read                        660     .0           5       7       1.0
  log file sequential read                 66     .0           4      65       0.1
  log file single write                    66     .0           1      16       0.1
  enq: RO - fast object reuse               2     .0           0      38       0.0
  latch: cache buffers chains               3     .0           0       6       0.0
  direct path write                       660     .0          -5      -8       1.0
  rdbms ipc message                     9,052   87.5 ;     21,399    2364      13.6
  pmon timer                            1,318   90.4 ;      3,562    2703       2.0
  Streams AQ: qmn coordinator             633   97.6 ;      3,546    5602       1.0
  Streams AQ: waiting for time             77   61.0 ;      3,449   44795       0.1
  PX Deq: Join ACK                         21     .0           0       0       0.0 
  

  Once again exceeded

  
  Tablespace IO Stats                  DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
  -> ordered by IOs (Reads + Writes) desc 
  
  Tablespace
  ------------------------------
                   Av      Av     Av                       Av     Buffer Av Buf
           Reads Reads/s Rd(ms) Blks/Rd       Writes Writes/s      Waits Wt(ms)
  -------------- ------- ------ ------- ------------ -------- ---------- ------
  UNDOTBS1
             914       0 ######     1.0 ;   1,368,515      383      2,534  863.2
  MDMREF_INDICES
           6,918       2 ######     1.0 ;      11,086        3          0    0.0
  SYSAUX
             626       0 ######     1.1 ;       1,804        1          0    0.0
  SYSTEM
             850       0 ######     1.7 ;         296        0          0    0.0
  MDMREF_DATA
             293       0  712.3 ;    1.0 ;         274        0          0    0.0
  MDMPRJ_ODS
             198       0   72.1 ;    1.0 ;         198        0          0    0.0
  FEU_VERT
              33       0   61.5 ;    1.0 ;          33        0          0    0.0
  USERS
              33       0   31.5 ;    1.0 ;          33        0          0    0.0
            ------------------------------------------------------------- 
  

  Now have a serious look. AV Dr (ms). For a value of tablespace cannot event now enter the window that's why its display #.

  According to the recommendation of the oracle Av Rd (ms) should not be greater than 20, if his will on 20 so its considered to be a problem with the IO subsystem. But as its seen in your case its passing.

  Now the question on my side
  Did configuration changes?
  I suggest you undo these changes as soon as possible and to communicate with the storage admin guys...

  Hope this helps

• The disk queue length

  I have a dell inspiron 3520, windows 8. I had windows update problems, and I can't update to windows 8.1. I can not reset or refresh windows 8. I was checking different things on my laptop and I went into advanced system tools and generated a system health report, and I got this warning: the average disk queue length is 3. The disc may be its maximum transfer due to the flow capacity and disk seeks. What does that mean? I would be very happy any help I can get with that.

  Thank you

  Cheryl Christopherson

  Suggestion in this thread: http://answers.microsoft.com/en-us/windows/forum/windows_7-performance/disk-queue-length-problem/4ee9b15a-0c02-435b-92ab-9d9a41ae84a5

  See also:

  Ref: https://technet.microsoft.com/en-us/library/cc938625.aspx

  AVG. disk queue length. logical disk or physical disk, to determine the number of i/o requests in the queue for the service. Note that this may overestimate the actual length of the queue, because the meter includes requests queued waiting and continuous training. If the average disk queue length is greater than two times the number of batteries, then you are probably developing a bottleneck. With a set of volumes, a queue that is never more short the number of active physical disks that you develop a bottleneck.

  Figure 8.8 shows a bottleneck of disk with high disk usage and a long queue.