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Monday, 14 March 2016

Absent vs. Degraded Status in VSAN 6.0

An ABSENT state reflects a transient situation that may or not resolve itself over time, and a DEGRADED state is a permanent state.

Note: If a failure in a physical hardware component is detected, such as an Solid State Disk (SSD) or Magnetic Disk (MD), VSAN immediately responds by rebuilding a disk object. Like the Example given below for disk failure vs disk ejected:-

To change the repair delay time using the VMware vSphere Web Client, run these steps on each ESXi host in the VSAN cluster:

1. Log in with admin credentials to the VMware vCenter Server using the vSphere Web Client.

2. Select the VSAN Cluster and highlight the ESXi host > Manage > Settings.

3. Select Advanced System Settings > VSAN.ClomRepairDelay.

4. Click Edit.

5. Modify VSAN.ClomRepairDelay value in minutes as required.

6. Restart the Cluster Level Object Manager (CLOM) service clomd to apply the changes by running this command:

/etc/init.d/clomd restart

Note: Restarting the clomd service briefly interrupts CLOM operations. The length of the outage should be less than one second. However, if a virtual machine is being provisioned at the time the clomd service is restarted, that provisioning task may fail.

7. Apply steps 1-6 to each ESXi host in the VSAN cluster.