HP XP Racks - Manual (Page 55)

Workflow for ensuring snapshot data is consistent with P-VOL data
Use the following workflow to ensure the snapshot data is consistent with the P-VOL data and is
ready to use in an BC Z pair user task:
1. Split the pair. To do this, complete one of the following:
•
If you are using RWC, split the BC Z pairs in the CG.
The volume is split (“Split/SUSPOP” status).
For more information about how to perform a CG pair-split , see “Workflow for consistency
group pair-split” (page 52) .
•
If you are using RAID Manager to run commands, run the following command on the BC
Z pair:
pairsplit
BC Z pair resynchronization
You can resynchronize split (“Split/SUSPOP” status) or suspended (“Suspend/SUSPER” status)
pairs, which pairs the split volumes. Resynchronizing a split pair copies the P-VOL’s differential
data to the S-VOL and again pairs the S-VOL with the P-VOL. Resynchronizing a suspended pair
copies the entire P-VOL to the S-VOL.
Resynchronizing a suspended pair copies the P-VOL to the S-VOL and takes the same amount of
time as the initial copy operation.
CAUTION: Resynchronizing a pair does not ensure data consistency. Data in the two volumes
is the same only if:
•
The P-VOL is offline.
•
The pair is split (the S-VOL status is “Split/SUSPOP”).
For more information about pair status, see “The RWC pair status names and descriptions”
(page 66) .
For more information about ensuring data consistency, see “Workflow for ensuring data
consistency” (page 49) .
NOTE: If you perform a Quick Restore for a pair consisting of an encrypted volume and an
unencrypted volume, the encryption statuses of the volumes are reversed.
Related topics
•
“Types of pair resynchronization” (page 55) .
•
“Workflow for resynchronizing BC Z pairs” (page 57) .
•
“Resynchronizing or restoring BC Z pairs” (page 58) .
•
“Volume pairs” (page 8) .
•
“Initial and update copy operations” (page 9) .
Types of pair resynchronization
You can forward or reverse resynchronize pairs. A forward resynchronization resynchronizes from
the P-VOL to the S-VOL. A reverse resynchronization restores pairs by resynchronizing from the
S-VOL to the P-VOL.
BC Z pair resynchronization 55