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    You should read these troubleshooting guidelines if you get a performance error while troubleshooting vsphere pstorage.

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    vsphere vstorage troubleshooting performance

    I recently ran into an issue on a VMware vSphere production cluster that was experiencing severe performance issues on a snowboard. After examining the symptoms of a specific performance issue, he suggested that native storage was the culprit. How do I fully diagnose a storage performance issue in VMware vSphere? Where do you hunt? What tools can you use to determine the underlying memory problem? What do you want to have on hand when you start troubleshooting a serious production issue affecting memory performance? It is good to anticipate and be prepared for production challenges, and have a checklist, tools and records on hand, and knowing where to find something that is essential to meeting SLA compliance. Let’s troubleshoot VMware vSphere esxi storage performance issues to address some of these important points that should be on your checklist before, during, and after troubleshooting.

    What Inform What Do You Need For Correct Troubleshooting?

    First, what kind of work will you have to pay for when you start troubleshooting your vSphere environment, especially the callback? As is often the case, users find it important to remember all the credentials and other information to learn all aspects of this vSphere stack. The last thing you might want to do is research some information just to get the right environmental aspects for bug fixes. What files are useful and really necessary to troubleshoot VMware vSphere storage issues while taking care of storage?

    At the same time, any documentation related to the generally up-to-date architectural scheme of all vSphere clusters is useful in all these situations. If you are unsure of how the vSphere Primary Cluster is configured, this method will greatly complicate troubleshooting. We all hate documentation, so we have to document things, but just before it affects production. Good documentation, accurate or readily available, can be a lifesaver In a close circle.

  • Hostnames / IP Addresses
  • ESXi host version and spot level
  • Root Passwords
  • Documented storage of IP addresses on VMkernel interfaces.
  • Storage Configuration – iSCSI etc.
  • Network connector – manufacturer, driver, etc.
  • IP numbers used
  • Firmware version
  • Connect to storage switches
  • VLANs configured for storage
  • Switch Configuration – LAG or Stack?
  • SAN Management Port IP Address
  • Firmware level
  • LUN RAID configuration, level, number of methods, sizes, disk firmware
  • Connect to various SAN management interfaces.
  • Vendor-specific SAN management tools loaded and ready to use
  • Of course, there may be more documented components described in more detail, but the more detailed they are, the better it is to understand how things are connected, configured, and therefore designed. This information is relevant when a change is made, it is also critical. Vsfera

    Troubleshooting ProductionVMware ESXi Storage Capacity

    vsphere vstorage troubleshooting performance

    Now that the documentation has been reviewed and reviewed, we can proceed directly to troubleshooting memory issues. What are the most important areas? ) A cluster of ESXi hosts that significantly slowed down the virtual machine at all levels. If all hosts malfunction, then the most likely provocations are that you need shared memory, which I did in my case, memory is automatically in almost all culprits. The likelihood of performance problems on multiple hosts on the same days, unless it is memory related, is highly unlikely. Shared memory is always a good starting point if performance degrades, exists across the entire vSphere cluster, and / or is not limited to the real host.

    Test ESXi Host Device For Memory Latency With ESXTOP

    Your best bet is to focus on ESXTOP on the ESXi host. Sharing ESXTOP memory is a great way to troubleshoot performance issues. This makes it very easy to troubleshoot latency issues. Directly from the articleIn the VMware Knowledge Base, which you saw here in Troubleshooting Storage Performance with ESXTOP, you can work around the latency values ​​as follows:

    1. Start esxtop by typing esxtop at the main command line.
    2. Press d to switch to disk monitoring mode (HBA mode).
    3. To see the full device name, press SHIFT L and enter 36 in the Resize name field.
    4. Press f to display the optimization fields that appear.
    5. Press b, c, d, e, h and j to switch between fields and be sure to press Enter.
    6. Press s, then 2 to change the update time every 2 seconds, press Enter and.
    Troubleshoot ESXTOP issues in latency storage per device

    For basic Lun troubleshooting, which I found very helpful in this case:

    1. Start esxtop by typing esxtop at the current command line.
    2. Press u to switch to disk standby) (Mon.
    3. Press f to change the displayed fields.
    4. Press b, c, f, navigate to domains and h and press Enter.
    5. Press s, then 2 to change the replacement time every 2 seconds, press Enter and.

    The following is really not a good example of explaining LUNs as devices. However, in an iSCSI environment, we will see the names of your devices with the above ESXTOP configuration.

    Troubleshooting ESXTOP memory latency based on LUN

    A good quality command to match a device name to a trusted “friendly name” or to the datastore name where you see the vSphere end user:

     esxcli-storage-vmfs-extension-list 

    Mapping a device name to a partition name or just a friendly name for the VMware datastore

    ESXTOP Columns To Check When Troubleshooting Memory Performance

    There are (4) columns that will really help you resolve ESXTOP latency issues with your current monitoring setup described above.

  • GAVG – Average Guest Latency is the total expected latency of the vSphere Guest or your personal VMs. Also note that GAVG is created from KAVGand DAVG.
  • KAVG – Average Kernel Latency is usually the time it takes for a vSphere I / O request to be on the memory stack
  • QAVG – Average Queue Latency is the time spent in the queue on the vSphere storage stack.
  • DAVG – Device Average Latency is the latency coming from the physical hardware, HBA and / or storage device.
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  • In the world of latency, another ideal world, we would like the latency to be “0”. In general, however, for anything well over 20 milliseconds, this rule is the best rule of thumb. However, with all of the above metrics, you should usually see the following for acceptable performance, which does not indicate a memory performance issue.

  • GAVG – almost all less than 20ms
  • KAVG – 0-2 ms
  • DAVG – 25ms or less
  • QAVG – 3ms
  • http://www.yellow-bricks.com/esxtop/
  • https://blogs.vmware.com/vsphere/2012/05/troubleshooting-storage-performance-in-vsphere-part-1-the-basics.html
  • Log Resources For Troubleshooting Memory Performance Issues

    An excellent log resource for checking potentialThere is a significant performance conflict with memory or in the vobd.log file. Is it in the / var / log directory? You can view the log using the following command after changing the list in the / var / log folder. As we can see below, events related to the mainframe are recorded. Now if you’re having memory lag issues make sure you get memory degradation messages with phone names etc.

     chat vobd.log | less 
    VOBD protocol for diagnosing network and performance issues

    Additional Troubleshooting Tips For VMware VSphere Storage Performance

  • Check everything between the actual architecture of your SAN and this type of iSCSI switch.
  • Check the switch logs for errors or other events related to the SAN or the electronics itself.
  • Ping iSCSI targets from new vmkernel addresses to ensure there are no problems connecting to real iSCSI targets.
  • Check only your SAN – make sure there are no stopped disks storage controller failures or other errors that may affect performance
  • Carefully check for free space on each mounted LUN for your ESXi hosts
  • Snack

    Troubleshooting VMware vSphere ESXi storage performance may seem daunting at first. However, with proper documentation, an understanding of your ultimate overall storage architecture, and many great built-in tools, your business can easily investigate any latency issues in the environment. It is very helpful to just see where you are sending the delay and possibly what devices it is experiencing. We hope that troubleshooting valuable items such as SAN storage and switches will allow us to pinpoint the culprit for the latency issue. Always use VMware technical support and vendor-specific storage software as they have the tools and know-how to quickly identify areas of misconduct.

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