Briefing Veritas Knowledge

What causes a NetBackup appliance RAID controller to be…

What causes a NetBackup appliance RAID controller to be in write-through mode for a data volume?

A.
failure of a single Hard Disk drive

B.
failure of the RAID controller battery

C.
failure of one of the links to the storage

D.
a RAID volume is in a degraded state

Explanation:
https://www.veritas.com/support/en_US/article.000084563