After removal of a Fault domain "vSAN Object Heath" shows All objects in Reduced availability with no rebuild
Article ID: 397877
Updated On:
Products
Issue/Introduction
After removal of a Fault domain all objects in the cluster show as "Reduced availability with no rebuild"
Environment
VMware vSAN (All Versions)
Cause
The Number of Fault domains no longer meet the minimum requirements of for the storage policy that is in use by the objects.
Below are the minimum number of Fault domain or Standalone hosts:
FTT=1 RAID-1 requires minimum 3 fault domain or 3 standalone hosts
FTT=1 RAID-5 requires minimum 4 fault domain or 4 standalone hosts
FTT=2 RAID-6 requires minimum 6 fault domain or 6 standalone hosts
Example
Raid 6 storage policy in use.
There are only 5 fault dominos configured which do not meet the minimum requirements for a Raid 6 configuration.
Resolution
Choose one of the following options to resolve this issue based on what's best for the environment and business needs.
- Add additional hosts to the cluster to allow for the creation of an additional fault domain to meet the minimum requirements of the storage policy in use.
- Remove the current fault domains to have stand alone hosts in the cluster that will meet the minimum requirements of the storage policy in use.
- Create a new storage policy that can be utilized with the existing fault domains.
Reference KBs
vSAN Health Service - Data Health – vSAN Object Health
"Reduced Availability with No Rebuild" in vSAN object health
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