In a mixed node cluster environment, before upgrading the NSS media to support AES, it is strongly recommended that you upgrade all the nodes to OES 2018 SP2. This is because the upgraded NSS resources might not be accessible from cluster nodes that are not upgraded to OES 2018 SP2.
Some issues can occur when you lose a device in an NSS software RAID 5 device, or when you expand an NSS software RAID 5 device. The following issues happen intermittently:
When a segment is missing in an NSS RAID 5 because of a device failure, the pool might hang until the device driver reports the error, and then the RAID continues. The hang time depends on the underlying device driver timeout conditions. For iSCSI devices, this includes iSCSI driver timeout. For extended hangs, the pool might also get deactivated.
Selecting an existing volume to perform Move or Split operation is supported on OES 2018 SP3 or later servers. This functionality (existing volume) is not supported with OES 2018 SP2 or earlier servers.