The objects on a 4-node vSAN cluster are assigned a RAID-5 policy. A network outage occurs causing host one to lose connectivity with the rest of the cluster. Seventy-five minutes elapse. What is the health state of the objects?
A.
Reduced availability with no rebuild
B.
Reduced availability with no rebuild "" delay timer
C.
Non-availability related incompliance [non-compliance]
A is the correct answer.
For RAID 5 needs 2n+2, assuming FTT=1 because just exist 4 hosts. Host required are exactly 4 hosts to protect that failure.
Reduced availability with no rebuild: The object has suffered a failure, but VSAN was able to tolerate it. For example: I/O is flowing and the object is accessible. However, VSAN is not working on re-protecting the object. This is not due to the delay timer (reduced availability - no rebuild - delay timer) but due to other reasons. This could be because there are not enough resources in the cluster, or this could be because there was not enough resources in the past, or there was a failure to re-protect in the past and VSAN has yet to retry. Refer to the limits health check for a first assessment if any resources may be exhausted. You have to resolve the failure or add resources as quickly as possible in order to get back to being fully protected against a subsequent failure.
https://kb.vmware.com/s/article/2108319
IMHO should be A
Arguments: Minimum number of hosts required for Raid 5 are 3 + 1. Then with 4 nodes vSAN Cluster if one host fails vSAN couldn't rebuild because the component has lost the parity.
Reference: https://kb.vmware.com/s/article/2108319
Reduced availability with no rebuild: The object has suffered a failure, but VSAN was able to tolerate it. For example: I/O is flowing and the object is accessible. However, VSAN is not working on re-protecting the object. This is not due to the delay timer (reduced availability - no rebuild - delay timer) but due to other reasons. This could be because there are not enough resources in the cluster, or this could be because there was not enough resources in the past, or there was a failure to re-protect in the past and VSAN has yet to retry. Refer to the limits health check for a first assessment if any resources may be exhausted. You have to resolve the failure or add resources as quickly as possible in order to get back to being fully protected against a subsequent failure.
Arguments:
Should be A,
Minimum number of hosts required for Raid 5: 2n+1
Reduced availability - active rebuild: The object has suffered a failure, but it was configured to be able to tolerate the failure. I/O continues to flow and the object is accessible. vSAN is actively working on re-protecting the object by rebuilding new components to bring the object back to compliance.
Reduced availability with no rebuild: The object has suffered a failure, but VSAN was able to tolerate it. For example: I/O is flowing and the object is accessible. However, VSAN is not working on re-protecting the object. This is not due to the delay timer (reduced availability - no rebuild - delay timer) but due to other reasons. This could be because there are not enough resources in the cluster, or this could be because there was not enough resources in the past, or there was a failure to re-protect in the past and VSAN has yet to retry.
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