Latency of disk metrics

Similar Questions

• Latency of DISK vscsiStats troubleshooting

  Hello forums.

  Could use an expert overview for a problem I have with some VM.  Use of resources is not the ability in some way.  No pretense of CPU but VM are slow - and often its bad or sometimes just slow.  The virtual machine had this, but for some time now, I know that we add more virtual machines in our lab, so that could explain the latency

  I would like someone offer help on using vscsiStats to vmdisk of troubleshooting related problems.  On the virtual machine, as I watched in perfmon, I noticed a somewhat long average disk queue length.  I ran vscsiStats and obtained after 30 minutes.  Please let me know if I understand this right.

  vscsiStats run with string only included latency IOs not in read/write latency.  Both drives are on the same data store.

  VMDISK 1

  Histogram: latency of IOs in microseconds (US) virtual

  machine worldGroupID

  121 min

  Max 14440236

  average 327165

  County 15524

  Histogram of the frequency

  Limit of bucket

  0                            1

  0                            10

  0                            100

  1488 500

  1929 1000

  1453 5000

  1618 15000

  1688 30000

  1070 50000

  1546 100000

  4732 100000

  VMDISK - 2

  Histogram: latency of IOs in microseconds (US) virtual

  machine worldGroupID

  159 min

  Max 14245418

  average 478629

  County 3446

  Histogram of the frequency

  Limit of bucket

  0                                 1

  0                             10

  0                             100

  1722 500

  146 1000

  136 5000

  15000 65

  30000 59

  50000 46

  100000 88

  1184 100000

  I don't really understand our provision of storage very well and I apologize I'm trying to learn it.  We use NetAPP, but I don't think that we all use the NetAPP storage.  These discs are fixed with 4 Gbps HBAS that are a SATA drive.

  My understanding of the above is the following:

  4732 written = & gt; 1 tenth of a second

  1546 written & lt; =.1 tenth of a second

  1070 written & lt; =.05 hundredths of a second

  My math may be a little off but it's a lot of latency for disk i/o? Your help is appreciated.

  See you soon,.

  Chad King

  VCP-410. Server +.

  Twitter: http://twitter.com/cwjking

  If you find this or any other answer useful please consider awarding points marking the answer correct or useful

  You're right, it comes by I/O latency. This means that an important part of your IOs have a greater than 100 milliseconds latency, it is high enough to be honest and I'm not surprised if you would notice general slowness. I wonder if you have for example checked if your disks are aligned or not? This could contribute to this level of latency. I also wonder how many links, you must return to your file server?

  Another thing worth investigating is the use of the processors of the spin.

  Duncan

  VMware communities user moderator | VCDX

  -

• Alarm for the latency of disk esxi-home

  I would like to set a new alarm to monitor all esx host disk latency in our vCenter.

  We found the settings, to set up this point for a virtual machine.

  [vCenter alarm-> add new detector for a virtual machine-> trigger Type: disc Total VM Max (ms) latency]

  So we need the same alarm, but for the esx host. But I can't find the right trigger type neighter events on the right (for which we can configure an alarm).

  The problem is that sometimes the Raid Controller battery is defective and then we notice everything by checking the performance of the disks-esx table:

  

  We need an alarm for exactly this measure: drive higher (ms) latency.

  I also searched for setting up an alarm in the store of data according to, but without success.

  Maybe someone has an idea how to set up such an alarm.

  Hello!

  There isn't any support in Client vSphere or vCenter. You can use esxtop to know but there is a lot of work to get a sort of wake-up call.

  A VMware product for this is vCenter operations, but it might be too depending on your environment.

  There is many products from 3rd party who will do that for you. vKernel VoP (formerly called vFoglight and I think that Veeam One will do this for you.)

  -Martin

• Latency of disk windsurf ESXi 4.1

  I have a new installation of ESXi 4.1 on a HP Proliant DL180 G6.  I gave a few VM, but I see a latency absurd in the disks, read latency is about 30 ms, and writing remains about 60 ms with spikes in the 400-500 + range whenever one of these virtual machines do anything associated with write or read something other than the smaller amount of data.

  The storage is local and it is the 7200 RPM SATA drives, and to make it worse, they are, in a RAID 5, I expected to see a latency, but I believe that what I feel is average higher than it should be.  Is what I feel to be expected considering the disks I use or is there something I need to look?

  Welcome to the communities.

  Your disk controller has the supported battery write cache module installed? Without it and write caching enabled performance will be poor. How many drives in your RAID 5?

• "the high latency of disk" on the performance tab appears

  Is it normal to have absolutely no activity on the upper Desk of the default latency '1 day summary' tab in vCenter performance? I have the latest updates on vCenter and ESXi 4.0.0 running on my hosts. Guests show CPU, disk use, and use of memory... but zip on this disk latency. We use a copula of IBM Nseries 6040 boxes I think (same as Netapp 3040) with NFS (no fibre channel).

  Since NFS is the network file system and not a block, file system you get not disk performance statistics, it is normal.

• Latency of disk queue

  Question about queue of disk latency. What are the acceptable numbers for the latency of writing, reading and command queue on the ESX host. I'm trying to figure out high that they can before guest virtual machines disk i/o is impacted.

  You might be interested in this document. Associated with Figure 4, she suggests that 50 ms of latency may start to affect latency sensitive applications.

  http://www.VMware.com/files/PDF/scalable_storage_performance.PDF

• How to export data from disk latency?

  I want to the latency of disk order data in CSV or XLS format but could not find a way to export.  Its not included in the existing reports.  I can view the data in a nice graph, but I can't go to the numbers.

  Anyone know if this is possible?

  Thank you

  

  Go to the section "all indicators; Locate this same metric and view it (choose the period that interests us).

  There, you have the ability to save data in CSV or PNG.
  I've attached a snapshot.

• ESXi 5.1 SMV degrade slowly with until this only unusable disk latency issues. How do I troubleshoot and resolve?

  Dell R710 servers

  Reference Dell Perc 6 / i raid controllers

  3 500 GB hard disks in a raid 5 configuration

  2 data stores.

  3 Red Hat linux 5.5 VMS servers.  Database intensive applications with e/s running high.

  Symptom: Servers become very slow or does not respond over time. Each VM restarts does not help. A restart of the entire server ESXi provides immediate relief and the process begins again. I can only run the servers about a week before I have to restart again.

  Disk latency may average in the range of 100 to 300 before a restart. After the reboot, the latency average in the range of 5 to 9 and slowly grows as the days pass.

  Use memory and CPU look normal to me. Uniformly flat even when the servers seem to have trouble.

  Any ideas what would cause this or how to fix?

  Please go to esxtop on the server and press D to see the latency of disk.

  FollowESXTOP - yellow bricks

  to troubleshoot latency.

• Data store / latency issues with HP ProLiant DL380 G7 - controller HP Smart Array P410i after disk 2014.09.0 SPP / hpsa - 5.0.0.74 update

  Hello

  We are currently investigating massive data store and the problems of latency of disk (mainly READING) on some of our HP ProLiant DL380 G7 with P410i (BBWC) controller.

  It all started after our half of regularly updated cycle for ESXi 5.1 U2 to:

  ESXi510-201407001 (no problem)

  -hp - esxi5.0uX - bundle - 2.1.1 - 2 (no problem)

  -HP-HPUtil-esxi5.0-bundle-2.1-15 (no problem)

  -hpsa - 5.0.0.74 (pilot) & SPP2014.09.0 (-assigned problems)

  It is not a permanent increase in the latency of reading, but rather meeting points that trigger alerts of Veeam. Store of data read latency increases about 5 MS to 100 ms as soon as this happens, but after a few seconds, everything is back to normal. These data warehouses special are RAID5 (but we have also seen some alerts on RAID1), having read and write cache enabled and the most affected machines are those with the LOWEST its use.

  We have a few WinServer2012R2 RDP for a small number of sessions (less than 5) - there is no noticeable delay on work on these.

  Maybe someone of you knows a similar behavior after you apply the updates of HP ProLiant servers. We don't have any idea on what to try next, a SPP restoration is not possible, maybe the pilot, but we find the correct predecessor, as the old drivers of 2014 HPSA leads the Group on the host computer.

  Best regards

  HZ

  Hello

  most likely, you have already solved the problem... I did some research and was in contact with HP. It is a problem with the driver hpsa - 5.0.0.74. It occasionally crashes when used with P410i. In the papers, you can find "WARNING: LinScsi: SCSILinuxAbortCommands:1843: failure, pilot hpsa to vmhba0. HP knows talking and working on the new driver. As a workaround, you can use hpsa - 5.5.0.60 (at least it works well for us).

  BR

  Maachah

• How graphic how the sum of several metrics of in a dashboard.

  I'm looking to find out how the graph of the sum of multiples of the metric, as CPU ready, or latency of disk in one graph on a dashboard / report.

  An example would be showing collective management s VM in balloning of CPU and memory of the pool on line on a chart.

  Thank you!

  If you want the chart to reflect everything that you can do the stacking graphics option which will be sleeping all values.

• IOPS / s & latency for each virtual computer

  It's my first time to write a script to metrics out of the virtual environment and I'm trying to get out of the latency of disk IOPS and total / s disk for each virtual machine in the environment.

  Here are the relevant excerpts I have at the moment:

  #Get powered on virtual machines

  $VMs = get - VM? {$_.powerstate - eq "Receptor"}

  #Loop through each virtual computer

  {foreach ($vm to $VMs)

  $dskreadlatency = get-Stat-entity $vm - Stat "disk.totalreadlatency.average" - Start $start - finishing $end

  $dskwritelatency = get-Stat-entity $vm - Stat "disk.totalwritelatency.average" - Start $start - finishing $end

  $dsknumberwrites = get-Stat-entity $vm - Stat "virtualdisk.numberwriteaveraged.average" - Start $start - finishing $end

  $dsknumberreads = get-Stat-entity $vm - Stat "virtualdisk.numberreadaveraged.average" - Start $start - finishing $end

  }

  #setting fields to the averages of the stats (I have 4 of them)

  = [string] $fieldX ([Math]: Round ((($dskYYY |))) Measure - Object - average value). Average), 2))

  Unfortunately, I get 0 for all these statistics.  My level settings are all set to 2.  It would be awesome if I could help in this regard.

  Just to make sure that the performance data entry process are correctly configured on vCenter, you see the data for these counters on the performance for the same time interval tab?

• Windows 2008 R2 PerfMon latency do not match ESXTOP

  Hi all

  I was faced with performance problems for my SharePoint SQL Server. I tried to find the bottleneck, and I was see some latency of less-than-desirable numbers in PerfMon. He is the guest of Windows 2008 R2 x 64 running on ESX 4.0 (build 294855) on vCenter 4.1 (build 258902). I see often numbers physique\Longueur disk s/reading for a medium disk above 10ms but often jumping more than 20 ms and sometimes much higher. 10 to 20 ms isn't bad, I know. HOWEVER, these numbers do not match what I see in ESXTOP and on the back-end storage. I have an IBM XIV, and his monitor disk latency is very close to that reported by the virtual machine in ESXTOP. That tells me that the Cisco MDS is not adding much to the latency. BTW, we are double FCoE (round robin) to Cisco 5010 s, which has so many paths of 4 GB to MDS, which has so many paths to the XIV. But ESXTOP reports usually 1/2 or better Perfmon. If the virtual machine will show, for example, a GAVG/cmd of, say, 3 ms, but PerfMon will show 9 Ms. ESXTOP will display 10 ms and PerfMon will show 20 +. LVAD/KMOY/GAVG metrics could be essentially flat, but they are bouncing up and down in PerfMon.

  Someone has an idea of what might happen? I understand that CPU and memory PerfMon counters are not very useful in the comments, but I have never read anything about the number of I/O, err. This would be another case where PerfMon is not reliable? However, the prompt is smart enough (this is SQL Server) to understand these metrics and will change its behavior accordingly. If SQL think lack of resources so his will react accordingly. Or, is it something in the virtualization layer to actually add 10 + ms of latency in the virtual machine? The disk is PVSCI and I think to change to LSI Logic SAS. I wonder if PVSCSI adds latency. Because he comes to Windows 2008 R2, the disks are already lined up.

  I'm afraid that the virtualization layer (or some other misconfiguration) adds latency of disk on the virtual computer, which in turn slows down the environment, which in turn causes the sales organization to shout in my direction. Any advice would be greatly appreciated. Thank you!

  Brian Laws, VCP4

  The problem with comments counters is not exact step is not specifically related to the CPU or memory.  On the contrary, it is related to a metric which is measured in a unit of time.  Thus, for example, what is measured in increments of seconds (average disk read/s, etc) could potentially be inaccurate.  This is because the virtual machines have complete access to a CPU to 100% of the time, so their perception of how long 1 second is actually might not be quite accurate.  It becomes more pronounced the more widely used the vCPUs of the guest are so how busy the ESX host is himself.

  I wouldn't trust the numbers coming from ESXTOP because they are not influenced by the present and are more accurate.  If you can also look at the numbers on your storage array and make sure they are near ESXTOP so you can probably ignore the data you receive in the comments.

  Matt

  My blog: http://www.thelowercasew.com

• How can I get information from performance on disc with vFoglight 6.5 latency?

  Can someone tell me where I can get info from performance on disc with vFoglight 6.5 latency?

  There are also alarms that deal with the latency of disk. You are looking for a report or dashboard? Check the alarm Viewer and define a filter on the "latency". This will show you all the current latency time, then you can explore the host or logical unit number that is having the problem.

• At what level is the store of data latency measured?

  Hello

  I have a question about latency of data store. I see that, generally, 20 to 30 ms latency limit before having the performance issue, but at what level is this limit? It is the seat of the latency of the VM? See vsphere?...

  In Vcops, when I select a data store and access operation - details see read/write latency: see comments AVG or device AVG? (see image below)

  

  When I select a VM in Vcops to see the latency time "of virtual machine", what is the difference between latency vDisk and the VM latency data store?

  

  I know there are a lot of questions in one thread, thank you in advance to those who take the time to answer.

  As esxtop counters, you have different counters to measure different parts of the stack. If you have latency at a disk level your queues will be filled and reflected. Latency of disk order is good enough to pick up underlying storage latency, but it depends what resource you are watching. The attributes derived from 'latency' exist here and there which are calculated based on the type of storage/etc to simplify your life and give you one place to search.

  When you start to look at the latency of the queue, you must keep in mind that focuses only on the queue. Take a look at the Duncan article (ESXTOP - bricks yellow) on it and your questions will probably be kept clear with regard to what are the bits/s and for the disk counters.

• Copy of simple file IO latency?

  A single copy of the file on the disk C: local, from one folder to another on a latency of disk causes of VM (LVAD/wr) to go up to 300 m, if I give the virtual machine to Windows 2008 R2 another drive, D:, that is located on another logical unit number, a copy of the file to C:\ D:\ makes same latency LVAD/wr go up to 1500ms. The high write latency is measurable on the other virtual machines on the same LUN.

  The same file copy activity on a virtual machine to Windows 7 on the same left LUN disk latency (LVAD/wr) less than 20 ms.

  Latency is measured with esxtop on the host and iometer within guests. There is no other virtual machine running in my tests.

  Is the latency of disk * supposed * to go so high a simple file copy? It would make me uncomfortable if someone copies a file to another folder on the file server could explode latency of writing for all other virtual machines too. Or is he not supposed to, and I've misconfigured something?

  Our facility:

  Server is HP Proliant DL165 G7

  SAN is HP MSA P2000i G3

  ESXi 5.0 driver cumulative 2

  The server has 4 cards gigabit ethernet. vmnic0 is connected to a switch, here the networks management and virtual machine are connected. vmnic1 is not used. vmnic2 goes to the port A0 on the SAN. vmnic3 goes to the port A1 on the SAN. Controller B on the MSA was arrested. The SAN has two LUNs. Using 'Manage paths' I disabled path vmnic2-A1 to Lun0 and vmnic3-A0 to Lun1, so each LUN has a dedicated cat6 cable. Both the Windows 2008R2 and Windows 7 virtual machines have been installed at Lun0.

  Thanks and strange that this behavior did not get all the attention. It's a bit it could cause strange results on the shared storage if several virtual machines are competing for the same disk systems.

  It could be that in reality is this kind of wholesale IOs often not possible, should it really be 32 MB of available continuous free disk space.