Pair status definitions

TrueCopy® User Guide

Version

9.8.7

Audience

anonymous

Part Number

MK-98RD9022-18

Both Device Manager - Storage Navigator and CCI pair status names appear in the Status column, except when the names are the same. When they are the same, the CCI status does not appear.

The following table shows both types of status names and their descriptions. In some cases, a particular status has no exact parallel status in the other interface. This is noted.

When checking the pair status, click Refresh to display the latest information. The P-VOL access and S-VOL access columns in the following table indicate whether the volumes accept read/write.

HDvM - SN status	CCI status	Description	P-VOL access	S-VOL access
Unpaired in HDvM - SN	SMPL	This volume is not currently assigned to a TrueCopy pair.	Read/Write	Read/Write
COPY*	COPY	The initial copy operation for this pair is in progress. This pair is not yet synchronized.	Read/Write	Read Only
PAIR	PAIR	The pair is synchronized Updates from the host to the P-VOL are duplicated in the S-VOL.	Read/Write	Read Only
PSUS (pair suspended-split) (See also Split types.)	SSUS, PSUS	The pair was split by a user or deleted from the secondary system. The pair is not synchronized. When you split the pair in the primary system, that system changes the status of the P-VOL and S-VOL to this status. In this status, updates to the S-VOL stop. The storage system keeps track of updates to the P-VOL in order to update the S-VOL when the pair is resynchronized. CCI also shows the P-VOL in this status. When you split the pair in the secondary system, that system changes the status of the S-VOL to this status. The primary system detects this and changes the P-VOL to this status. However, if there is no I/O from the host, the status of the P-VOL might remain PAIR. CCI shows the S-VOL status as SSUS. When you release the pair in the secondary system, that system changes the S-VOL status to SMPL . The primary system detects this and changes the P-VOL to this status. The pair must be released from the primary system in order to change P-VOL status to SMPL. CCI PSUS status indicates that although the paired status is retained, the user split the pair. This status is only for the P-VOL. While the pair is split, the storage system keeps track of updates to the P-VOL in the differential bitmaps.	Read/Write	Read only if Secondary Volume Write option is disabled. Read/Write if Secondary Volume Write option is enabled.
PSUE (pair suspended-error) (See also Split types.)	PSUE	The primary or secondary system splits the pair due to an error. If the primary system cannot keep the pair synchronized for any reason, it changes the status of the P-VOL and S-VOL (if possible) to this status. The pair is not synchronized. CCI PSUE indicates that although the paired status is retained, updates to the S-VOL is sopped due to an error status. CCI PSUE is PSUS (SSUS) caused by an internal error. (VSP Gx00 models, VSP Fx00 models, and VSP E series) A user deleted the pair from the secondary system. (VSP Gx00 models, VSP Fx00 models, and VSP E series) An error occurred in the secondary system or the secondary volume, or during an update copy of TrueCopy. (VSP Gx00 models, VSP Fx00 models, and VSP E series) Communication with the secondary system was disabled.	Read/Write. Read only if Primary Volume Fence Level is Data.	Read Only
-	SSWS	CCI SSWS status indicates that the pair status is retained. The P-VOL and the S-VOL of the pair is switched and then they are resynchronized (horctakeover).
* When the pair status is COPY, neither cache nor shared memory can be added to or removed from the storage system. When either of these tasks is to be performed, wait until the pair status changes to PAIR, or split the TC pair, and then resynchronize when the cache or shared memory operation is completed.