VSAN-Troubleshooting-Reference-Manual

Diagnostics and Troubleshooting Reference Manual – Virtual SAN
the detailed physical device view to determine if you need more magnetic disks or
flash devices.
If however only a single host’s physical disks are showing contention, while other
hosts are operating fine, then you may have an imbalance, possibly due to a set of
particularly noisy VMs.
Navigating VSAN Observer – VSAN Disks (deep-dive)
Next to the VSAN Disks tab is VSAN Disks (deep-dive). This tab provides a wealth
of information broken down to each individual physical disks (both flash devices
and magnetic disks) on a per host basis. This is the layer that actually does the I/O
to SSD and/or magnetic disks. Using this view one can get insight into how Virtual
SAN is splitting the I/O work between the flash devices/SSDs and magnetic disks.
To see the statistics, select the host that you are interested in. This view provides
read cache hit rates, cache evictions and write buffer fill for SSD. Also, latency and
IOPS stats are provided for all disks in each ESXi host.
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