VSAN-Troubleshooting-Reference-Manual

Diagnostics and Troubleshooting Reference Manual – Virtual SAN
Third party tools
As Virtual SAN uses third-party storage I/O controllers and flash devices, it may be
necessary to use specific tools provided by these vendors to configure and check
status.
Using these tools, e.g. MegaCLI from LSI or the hpssacli extension to ESXCLI from
HP, you can check the status of the storage controller as well as the disk devices
attached to the controller. You can also verify that the cache is configured properly
on the controller (e.g. disabled, or set to 100% read, in both cases disabling write
cache).
You may also find that you PCI-E flash device vendor also supplied tools for
checking configuration and status. For example, FusionIO/SanDisk is one vendor
that provides such a set of tools.
We will look at how to use these tools in various places in this reference manual.
Troubleshooting tools summary
With this set of tools at your disposal, you should be in a position to monitor,
diagnose and troubleshoot Virtual SAN. The vSphere Web Client and ESXCLI
commands are covered in the official vSphere documentation, and only the
commands relevant to Virtual SAN are covered in this reference manual. The
complete official vSphere documentation can be found at the following link:
https://www.vmware.com/support/pubs/.
This reference manual will focus on all aspects of RVC and VSAN Observer, with a
goal of getting the reader to a point where they can confidently troubleshoot Virtual
SAN issues. The combination of the vSphere Web Client, ESXCLI, RVC and VSAN
Observer represent a very complete and powerful toolset to fully observe the inner
workings of Virtual SAN. The remainder of this reference manual will focus on how
to use these tools to diagnose and troubleshoot Virtual SAN environments.
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