Suspend conditions for Universal Replicator pairs

The following table lists the suspend conditions for Universal Replicator pairs, the storage system that detects the condition, and the volume pairs that are suspended.

Suspend condition	Detecting storage system	Suspended pair
Logical error was detected in secondary system while selecting journal data that will be restored.	Secondary system	All S-VOLs in journal or affected S-VOL.
Journal data could not be restored in secondary system due to HW failure, track status, or logical error.	Secondary system	All S-VOLs in journal or affected S-VOL.

Differential bitmap for each P-VOL is stored in shared memory in the primary system. The differential bitmap for each S-VOL is stored in shared memory in the secondary system. A UR pair that uses a DP-VOL V-VOL whose size is more than 4,194,304 MB (8,589,934,592 blocks) does not use shared memory. For tracks that include the following journal data, it will be marked within differential bitmap (since it needs to be copied during pair resync):

Journal data that was created at the primary system and not yet sent to the secondary system. The primary system will mark these P-VOL tracks as "changed" and then delete the journal data.

Journal data that was sent to the secondary system but not recognized yet. The primary system will mark these P-VOL tracks as "changed" and then delete the journal data. By this, it can be marked as confirmed for journal data that was lost while being sent to the secondary system.

Journal data that was delivered to the secondary system but not yet restored. The primary system will mark these P-VOL tracks as "changed" and then delete the journal data. By this, it can be marked as confirmed for journal data that was lost while being sent to the secondary system. The primary system will not delete the target journal data from the master journal volume until receiving the restored journal's sequence number that is added to the read journal command from the secondary system.

P-VOL that was updated by write I/O from the host after the pair was suspended.