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
Documented storage of IP addresses on VMkernel interfaces.
Storage Configuration – iSCSI etc.
Network connector – manufacturer, driver, etc.
IP numbers used
Connect to storage switches
VLANs configured for storage
Switch Configuration – LAG or Stack?
SAN Management Port IP Address
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
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:
Start esxtop by typing esxtop at the main command line.
Press d to switch to disk monitoring mode (HBA mode).
To see the full device name, press SHIFT L and enter 36 in the Resize name field.
Press f to display the optimization fields that appear.
Press b, c, d, e, h and j to switch between fields and be sure to press Enter.
Press s, then 2 to change the update time every 2 seconds, press Enter and.