Change in the calculation of the threshold of IOPS / s between 5.1 and 5.5

Hello world

Some of my users complained about the performance degraded after that I migrated the host of 5.1 to 5.5. After a bit of poking around, I had to remove the limits of PAHO are / s in order to restore their previous performance...

So, I did a simple test on the 2 VMs. Here's the info about the test:

A host running vSphere 5.1, with SSD (OCZ ZDrive R4) card connected. A vm W2k12 R2 running on it, version 9 of vm, vmtools build 9221. 2-disc limited to 500 IOPS / s of each, so 1000 Ops ARE / s total

A host running vSphere 5.5, same card plugged SSD. A clone VM vm first, version updated to 10, vmtools build 9349. IOPS / s limit matches

Storage I/O control is disabled on the 2 hosts, but I did a few tests with active IGCs, and it was not conclusive

Operating mode:

1 take this http://vmktree.org/iometer/OpenPerformanceTest32.icf file

2 IOMeter v1.1.0 Iometer project - downloads, pre-build binary for x 86-64

3. has launched the 'Max - 100% read throughput' specification without change, outside of the "transfer request size. I changed this setting from 8 KB to 512 KB

limit_iops.png

Here are the results:

limit_iops002.png

As you can see, the limitation is handled completely differently from one version to the other... In addition, the average response time is crazy on the ESX 5.5!

I searched for an explanation for this change, but I can't find anything...

So, how can I go back to the old behavior? Because we have different types of workload and the different types of IO size, I can't have a simple formula to get an appropriate limit. I have to have a strict limit of the IOPS / s, regardless of their sizes...

Thank you all,

-Vincent.

Hi all

After an open case and dozens of tests, I found these links, explaining this beahviour "weird":

New scheduler used in vSphere 5.5 disk i/o

vSphere 5.5 and limits of disk (caveat mClock scheduler)

In short, the new introduced in vSphere 5.5 disk IO Scheduler consider an e/s with a maximum of 32 KB. If your IOs are larger, when you specify a limitation of IO, the calculation will be in multiples of 32 KB... Please, read these links, Duncan explains really well... Congratulations to him!

I'm just annoyed that VMWare does not communicate enough on these changes, because they are big enough!

Kind regards

Vincent.

Tags: VMware

Similar Questions

  • After installing ElCapitan 10.11.4 on my G5, if I stopped for the night for some reason, the computer starts again sometime between 03:00 and 07:00. Any thoughts?

    After installing ElCapitan 10.11.4 on my G5, if I stopped for the night for some reason, the computer starts again sometime between 03:00 and 07:00. Any thoughts?

    Sounds like an Energy Saver preference, but what computer do you use?  A G5 (PowerPC) machine will not work on El Capitan.

  • Change in the thresholds of CPU temperature

    Hi guys,.

    One of our m3 nodes c220 has a low Max. Warning and Max. The failure for the P2_TEMP_SENS value:

    P2_TEMP_SENS name:
    Sensor State: Normal
    Reading: 42.5
    Units: C
    Min. caveat: n/a
    Max WARNING: 62.0
    Failure of at least: n/a
    Max-failure: 72.0

    I don't know how this value has been set, the other processor on this node has a "maximum caution 'value of 96.0 and one' Max. failure"value of 99.0 as do processors I checked in our other nodes. "  This threshold down is at the origin of many messages be recorded in the journal of CIMC events, that the CPU temperature regularly exceeds those thresholds.  This question is that I don't know how I can reconfigure these thresholds.  These thresholds have been set or can they be set up?

    Hello

    Can you provide a screenshot of it?

    Also I do not think there is anything that you can set these values, it must be set by the system.

    This server is running this firmware?   You're other nodes running the same firmware?

    Try the upgrade of the firmware of your server and look at these values.

    I would like to know if this helps.

  • clock did not automatically change on the computer, I went to control panel settings and could not change?

    See above... Thank you...

    Hello

    Are you logged on as ADMINISTRATOR?

    Double-click the clock in the lower-right - change Date and time.

    I hope this helps.
    Rob - bicycle - Mark Twain said it is good.

  • Disabling the firewall to apple shares between apple tv and my computer

    I want to share services such as my music and other services on my computer to apple but 4th tv instructions tell me to turn off the firewall.  Don't that make me vulnerable to hackers or what ever on the internet?

    Not really. If your computer running iTunes and your Apple TV is both on your wifi at home then your router'S firewall. As long as you use the wifi WPA2 encryption can really no need to worry about running a firewall software on your computer.

    Others might disagree, but it comes down to balancing ease of use with paranoia.

  • Doubt the implementation in a VPN between a VPN3005 and a Cisco 827 router

    Imagine this:

    Establish a VPN tunnel between the central administration (VPN3005) and a branch (827). Only need to spend intellectual property data in the tunnel and the two sites must reach the resources of the other, which means I don't want not just any what NAT involved.

    Can someone tell me what is the way to better/simple to do this?

    Can it be implemented with Cisco easy VPN? (or not, due to not wanting to make any type of NAT)

    Thanks in advance!

    Hello

    I would have preferred a VPN Tunnel from Lan to Lan. I have attached a few URLS that

    explains the implementation of IPSec Lan to Lan tunnel in different scenarios:

    1. with the router with a static routable ip address

    http://www.Cisco.com/warp/public/471/ALTIGAR.shtml

    2. with the router is assigned an IP via DHCP.

    http://www.Cisco.com/warp/public/471/vpn3k_iosdhcp.html

    Kind regards

    Arul

  • The button behavior is different between Windows 8 and Windows 7

    Hello

    I'm developing an application that runs on Windows 7 and Windows 8. This application is intended to be used with a touch screen. Users must make choice of a ListView.

    With Windows 7, everything works fine. Items are selected when the user clicks on it.

    Things are different on Windows 8. If the user do not type in the center of the item (IE, if the finger touches simultaneously two elements), Windows seems to think that the selection is ambiguous and does not select anything. This is particularly problematic when the list contains small pieces of interface user, in which case the user must be very specific by touching the screen.
     
    Is it possible to disable this behavior, or reduce the radius of ambiguity?

    Thank you

    Simon (sausage fingers).

    I'm developing an application that runs on Windows 7 and Windows 8. This application is intended to be used with a touch screen. Users must make choice of a ListView.

    With Windows 7, everything works fine. Items are selected when the user clicks on it.

    Things are different on Windows 8. If the user do not type in the center of the item (IE, if the finger touches simultaneously two elements), Windows seems to think that the selection is ambiguous and does not select anything. This is particularly problematic when the list contains small pieces of interface user, in which case the user must be very specific by touching the screen.
     
    Is it possible to disable this behavior, or reduce the radius of ambiguity?

    Probably a better question for TECHNET as consumer forums.
     
    Numbers of rolliche good luck!

  • The parameters are not sync between CC AI and AI CC 2014

    I can't get AI AI CC 2014 CC sync settings. I am able to sync settings HAVE CC and supposedly they are available in the cloud, but when I open AI CC 2014 workspaces and keyboard shortcuts are not available for me to choose. Having the same problem in CC ID and ID CC 2014 as well. I was finally able to get PS CC 2014 to load my settings, but I'm not entirely sure why those decided to appear. Anyone else having this problem and have a solution to fix?

    Stuart, l3acon,

    It has been in other threads here. CC 2014/DC18 works as a new version.

    import parameters in cc 2014

  • Proxy settings to change since the update for Firefox 4

    I had just recently updated for Firefox 4 and as soon as it finished downloading I tested and that he saw that he changed my 127.0.0.1 proxy settings. I changed it to "Not of Proxy", but when I close and return back on the Internet, the Proxy settings are changed to the number of localhost. I used AVG and Malewarebytes scan my computer from infection and found none. Anyone know what is happening?

    Some extensions like the Assistant Microsoft .NET Framework installed worldwide and cannot be disabled and not uninstalled in Firefox.

    To disable the extensions to solve your problem?

    If this does not work in mode without failure, then disable all extensions and then try to find out who is the cause by allowing both the problem reappears.

    • Choose "Disable all add-ons" on issues to troubleshoot Firefox in Safe Mode to set window to disable all extensions.
    • Close and restart Firefox after each change through "file > exit ' (Mac: ' Firefox > leave";) Linux: "file > exit ')
  • A change for the better? You must be kidding!

    "A change for the better! Hello, we love our customers and we take your comments to heart. That's why we will change how storage works for free Adobe Revel accounts.  In a few weeks, the free accounts of Revel will come with 2 GB of cloud storage instead of the current limit of 50 photos/videos per month. This is great news because it means that you will be able to store and share around 1000 photos with friends and family without worrying about a monthly limit"

    Unfortunately, only a change for the better for Adobe having to store less on their servers for free! I understand the reasoning, but to say it is better for the user kinda irks me. I thought I'd go Premium (as I think it's worth) and now will have to but do not tell us it's for our benefit. Joke email.

    In fact I have not yet received the email, my partner who has an account and share my library does.


    The site also says "our talks about customers and we listened" (well some web pages have been updated, while others always say about 50 download limit).

    I can't imagine many customers saying ' Can I have less free!



    Apart from that, keep up the good work!

    With the new model, there will be a limit of 2 GB storage for free accounts. You can continue to use revel for free with the new model change, however, if you have registered more than 2 GB of files, then you will not be able to download additional photos or videos until you delete some files to get below the limit you or subscribe to get unlimited downloads.

  • What is the best way and to share data between a server and a Client app?

    Hello

    I'm trying to communicate a Client-Server application.

    In fact, I already have a simple data transfer via TCP/IP. However, I don't know yet, if TCP/IP is the best (and by that I mean, better, faster, safer, etc.)

    How to do.

    What are the cons and Pros between TCP/IP, STM and shared Variable?

    Do you recommend another type of communication in addition to these 3?

    Thank you

    Matt.

    In my view, that a general question cannot have a response says.

    Then, there is no way 'the best' for sharing data between a client and a server app.

    I like to use TCP/IP, but sometimes (when data loss is not critical) I use UPD (quick and dirty).

    I generally avoid shared variables, especially on embedded devices.

    Some other times I have I like to Exchange data in a database...

    A few other times I Exchange data using file...

    Marco

  • How to change the threshold value

    Hello

    I want to change the default threshold my threshold of space available on the VM disk... Please share the document

    Kind regards
    Gopi

    Hey Gopi,
    If I understand correctly, you want to adjust the thresholds for alarms.
    The Foglight registry has all these variables. We recommend that if you change something, you take note in the variable about which was the default, time, reason, etc.
    In the dashboard:
    The administration | Rules & Notifications | Manage the registry Variables
    In addition, you can change the rules. If you want to change the rules, please COPY the rule and disable the original rule. Make changes to the copied rule.
    In the dashboard:
    The administration | Rules & Notifications | Manage rules
    VFoglight documentation is available if you connect to the site Vizioncore, go to the Downloads tab and then select the content sub-tab.
    If you have a more specific question, please just after it.
    Thank you
    -dave

  • HPCM error - definition model has changed since the last calculation

    Hello world

    I have a bit of a problem on an application Coordinator.

    (1) message warning when I go to balancing-> "model has changed since the last calculation."
    (2) message when I select cube considered in balancing-> 'the database has not been updated with the latest results of calculation."

    What has been done before I got to this point:

    (1) add a few lev 0 members in the current hierarchy for cost center
    (2) run a comparison to check if they are picked up (OK!)
    3) deploy EPMA (result: SUCCESSFUL message)
    4) go to HPCM and deploy the two cubes (OK-> at least is what the status of the job)
    (5) control of new members in OTL (OK! they are there)
    (6) the HPCM Calc launch, check the box to erase all data of calc prev, check the box to regenerate calcs, check the box to transfer data to the reporting cube.
    result: employment status: OK!

    But in reality: never got transferred through to the reporting cube.

    I repeated steps 1 through 6, a few times, I even changed something in the (alias) shared library to check if it went through.
    In EPMA it says that the app is 'in sync with the deployment. And when I run a comparison with deployed application, it does not pick up anything.

    Any ideas?

    Thank you

    Kind regards
    Annie

    Hello world

    Just realised I never came back with the answer to my question. I was developing the new application and starts the compilation of the Calc sequentially, so while I was developing Calc for step 2 or 3, rebuild only those scripts are calculate only the specific areas. This is the reason why I received this message. As soon as I transferred both apps and recalculated at the beginning, the error message disappeared.
    Just in case someone wondered.

    See you soon,.
    Annie

  • rate of dynamic changes in the worksheet

    Hello, e n one explain how to add a dynamic change of a currency in a Numbers spreadsheet? I can't find in the formula section.

    Thank you

    Hi Sean,.

    Number can make calculations, once rates are in the table, but cannot, in itself, go out and pick the one (s) from an external source. This will require the talents of an AppleScript script.

    The script, it will take the talents of a scripter to write (there are a few who visit here regularly) and and the writer will need some information:

    What Exchange rate do need it?

    Where are they available?

    Can you describe the structure of the source? (Otherwise, the person who takes on the writing of scenarios may be able to determine the structure once the site is known).

    I'm sure that there will be more specific questions, but answers to those above will do for starters.

    Kind regards

    Barry

  • How to determine the threshold for an LED voltage

    A density of current over voltage that is generated by one of my Labview OLED measurement systems is attached.  I'm trying to programmatically determine the threshold voltage.  When the data is displayed in the logarithmic scale it is possible to observe a charge injection clear (0.8, 0.000203).  The problem is that I can visually observe this value, but I'm not able to solve by program for her.  I tried to take the derivative to observe the changes of slope, but only to determine the operating voltage.  Any ideas how I could solve this value?

    Thank you

    E

    You are on the right track, you just have to do deeper. Try to take the 2nd derivative and find the points where it is larger. This will show you where the log graph is concave upward and where is your ve. I've included a plot of Log (data), D (Log (data) and D (Log (Data), 2).) I also have zoomed in on the area of interest, then pay attention to the balance.

    You may need to make some good assumptions. For example, with exactly what I posted above, you get Vth = - 0.4 or so. If you assume Ve > 0, then you get Vth = 0.8.

    In addition, you probably want to do other fancy stuff such as: interpolate the data to get more points, smooth interpolation, trim the ends of the derived data (they want 0 according to your derived method).

Maybe you are looking for