Host Write Throttling on tape attach cache partition started because of the
following reasons:
Premigration steady state: Data size in Premig queue exceeds Premig Throttling Threshold.
Low on cache free space: Cache free space is low.
Immediate copy throttling: Immediate copy related with the cluster remains in Copy queue for
long time.
Excessive cached content for Copy: Cache is getting full by amount of data which has not been
copied to other cluster yet.
Grid Premigration steady state: There is an immediate Copy related with the cluster and Premig
Throttling is being applied in the peer cluster for the RUN copy.
Low on partition free space: Partition free space is low.
Operator response
Check if Host Write Throttling started because of expected
reasons.