VSAN-Troubleshooting-Reference-Manual

Diagnostics and Troubleshooting Reference Manual – Virtual SAN
esxcli hpssacli cmd -q "controller slot=0 modify cacheratio 100/0”
On HP storage controllers, the configuration advice is to disable cache, or if you
cannot disable it completely, set it to 100% read. This command will set the cache
ratio to 100% read and 0% write. Read is the first field and write is the second field
– 100/0.
esxcli hpssacli cmd –q “controller slot=0 array H delete forced”
This command will delete disks from the controller. This will remove the disk from
the Virtual SAN disk group, so it is advisable that the host is already in maintenance
mode, and if possible, the data already evacuated if this is a maintenance operation.
The operational status of the disk is Dead or Error (which basically means an All
Paths Down (APD) condition from an ESXi perspective). The disk device also shows
up as absent in the disk group. For additional details on observed behaviors when a
device is removed in this way, refer to the storage section which discusses failed or
removed devices.
If you simply want to test the behavior of Virtual SAN when a drive is offlined, then
this command will place either a magnetic disk or SSD offline. Virtual SAN will then
mark this disk as absent, and unless the original disk is reinserted before the rebuild
timeout has expired, rebuilding of components will begin.
esxcli hpssacli cmd -q "controller slot=0 create type=ld drives=1I:1:4
raid=0"
This command adds a new logical device with a RAID-0 configuration to the host
using physical drive located at 1I:1:4.
If you previously force deleted a disk from the host (either magnetic disk or SSD),
then this command will add it back in with a RAID-0 configuration, a necessary step
for Virtual SAN to recognize devices from some HP controllers.
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