PSUS types and behaviors

The PSUS status can be set by the user or the system and from the primary or the secondary system.


PSUS type	Volume PSUS type applies to	Description
PSUS, S-VOL by Operator	P-VOL, S-VOL	The user split the pair from the primary or secondary system, using the S-VOL-writeoption. CCI displays this PSUS type as SSWS.
PSUS, by MCU	S-VOL	The secondary system received a request from the primary system to split the pair. The P-VOL PSUS type is PSUS-S-VOL by Operator. CCI displays this PSUS type as SSWS.
PSUS, by RCU	P-VOL, S-VOL	The primary system suspended the pair after detecting an error condition on the secondary system. The S-VOL suspend type is PSUE-S-VOL Failure. CCI displays this PSUS type as PSUE.
PSUS, Pairsplit-S to RCU	P-VOL	The primary system detected that S-VOL is unpaired after the user released the pair from the secondary system. The pair cannot be resynchronized.
PSUS, JNL Cache Overflow	P-VOL, S-VOL	The pair was suspended because the journal volume was near capacity. CCI displays this PSUS type as PFUS or SSWS.

A pair must be split to perform maintenance on the P-VOL, or to enable write-access on the S-VOL.

If you enable the S-VOL write-option when splitting the pair, the secondary system keeps track of updated S-VOL tracks. When the pair is resynchronized, the secondary system sends the S-VOL track bitmap to the primary system, which then merges P-VOL and S-VOL bitmaps to synchronize the tracks.

A split or suspended S-VOL has a separate consistency status, which indicates the S-VOL’s update sequence consistency with respect to the other S-VOLs in the associated journal. Consistency status displays on the secondary system only. S-VOL consistency status is described below.

S-VOL consistency statuses


Volume	Only the current pair was split or suspended. Update sequence consistency between this S-VOL and other S-VOLs in the associated journal is not ensured. This S-VOL cannot be used for disaster recovery at the secondary site. This status is indicated when: The pair is split by the user using the Split Pairs window. The pair is suspended due to a failure that did not affect the entire journal.
Mirror	The pair was split or suspended along with the other pairs in the associated mirror. Update sequence consistency between this S-VOL and other S-VOLs in this mirror is ensured. This S-VOL can be used for disaster recovery on the secondary system. This status is indicated when: - The pair is split using the Split Mirrors window. - All pairs in the associated mirror are suspended due to a failure that affects the entire group; for example, path failure. - One pair in the mirror was suspended due to a failure that did not affect the entire group.

Consistency status

Description

Volume

Update sequence consistency between this S-VOL and other S-VOLs in the associated journal is not ensured.

Mirror

The pair was split or suspended along with the other pairs in the associated mirror.

Update sequence consistency between this S-VOL and other S-VOLs in this mirror is ensured.

- The pair is split using the Split Mirrors window.

- All pairs in the associated mirror are suspended due to a failure that affects the entire group; for example, path failure.

- One pair in the mirror was suspended due to a failure that did not affect the entire group.