VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN Virtual SAN storage device failure observations In this section, events from when disk devices are removed from a host participating in a Virtual SAN cluster are examined, and also what happens when a device actually fails. Both have different behaviors, and need to be understood by anyone who is going to troubleshoot storage issues on Virtual SAN. Observations when a disk is failed/removed in a controlled manner In this example, to observe the behavior of Virtual SAN when a disk is removed, storage I/O controller CLI commands were used to remove a disk from the host. HP CLI commands were used to offline the drive, and observed what the ESXi host and Virtual SAN reported when this event occurred. Virtual SAN marked the disk as ABSENT, giving an administrator a 60-minute window to put the drive back online. The disk was in a logical RAID 0 volume, as the storage controller in question did not support pass-through. The first thing observed was the Unhealthy disk group state and the drive ABSENT state via the vSphere web client, when the disk groups were examined: The disk flagged as Absent shows an operational state of Dead or Error. The next step is to look at the event logs, as they show some interesting detail: V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 1 5 6
Diagnostics and Troubleshooting Reference Manual – Virtual SAN The sequence of events starts with Virtual SAN determining that the device has a permanent failure, then the disk going offline, then lost connectivity, then the APD or All Paths Down (APD) to the device being permanently inaccessible. In version 5.5, there were no alarms for Virtual SAN. These had to be configured manually. In 6.0, a number of alarms have been added and will trigger automatically. By selecting the Virtual SAN cluster object in the vCenter inventory and navigating to the Manage section, the alarm definitions can be viewed. Here is the alarm generated when a disk error occurs. You can also see that it is configured to send an SNMP trap when triggered. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 1 5 7
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VSAN-Troubleshooting-Reference-Manual

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