HDvM - SN pair status names and descriptions

The following table shows a list of HDvM - SN pair status names and descriptions, including the level of S-VOL access.


HDvM - SN status	Description	P-VOL access	S-VOL access
SMPL	The volume is not part of a pair.	Read/write enabled	Read/write enabled
SMPL(PD)	The pair is in the process of being deleted.	Read/write disabled⁴	Read/write disabled
COPY(PD)/COPY ²	The paircreate initial copy is in progress.¹ The storage system accepts read/write to the P-VOL but does not accept write operations to the S-VOL.	Read/write enabled	Read only
PAIR	The initial copy operation has completed and the volumes are paired. The storage system performs update copy operations. Data consistency is not ensured for SI pairs in this status.	Read/write enabled	Read only
COPY(SP)/COPY ²	The pair is in the process of being Steady Split. The storage system: Copies the differential data to the S-VOL.¹ The data in the S-VOL is identical to data in the P-VOL. Splits the pair. For more information about the Steady Split method of splitting pairs, see Pair splitting methods.	Read/write enabled	Read only
PSUS(SP)/PSUS ²	The pair is in the process of being Quick Split. The differential data is copied to the S-VOL in the background.¹ You cannot delete pairs in this status. For more information about the Quick Split method of splitting pairs, see Pair splitting methods.	Read/write enabled	Read/write enabled
PSUS ³	The pair has been split. The storage system stops performing update copy operations but accepts write I/Os for the S-VOL. The storage system keeps track of updates to split P-VOLs and S-VOL so that you can Quick Resync.	Read/write enabled	Read/write enabled
COPY(RS)/COPY ²	The `pairresync` CCI command is in progress. The storage system does not accept write I/Os for S-VOL. Resynchronizing split pairs copies only the differential data to the S-VOL.	Read/write enabled	Read only
COPY(RS-R)/RCPY ²	The `reverse pairresync` CCI command is in progress. The storage system copies only the S-VOL differential data to the P-VOL. The storage system does not perform update copy operations during a Reverse Copy or a Quick Restore. The storage system does not accept write I/O operations to S-VOL.¹	Read/write disabled	Read only
PSUE	The storage system does the following: Suspends the pair. Continues accepting read and write I/Os to the P-VOL. Stops update copy operations to the S-VOL. Marks the P-VOL as differential data. Resynchronizing a pair copies the P-VOL to the S-VOL.	Read/write enabled	Read only
The starting time of the copy depends on the numbers of pairs and the storage system environment. The pair status will be displayed as "Pair status on screen/Pair status of CCI". CCI will be displayed as following: P-VOL: PSUS S-VOL: SSUS If the status was Read/write enabled before the transition to SMPL(PD), it is Read/write enabled.