HP XP Racks User Manual
Page 22
Guidelines
If you are sharing BC Z P-VOLs with Cnt Ac-S Z or Cnt Ac-J Z S-VOLs, use the following guidelines
when performing a CG pair-split:
•
Maintain a consistent backup of the BC Z S-VOLs.
For more information about maintaining consistent backups of volumes, see
maintaining consistent Business Copy Z secondary volume backups” (page 54)
•
Ensure that all BC Z pairs in the CG are in “DUPLEX” or “PENDING”status.
NOTE:
If you share BC Z pair P-VOLs with Cnt Ac-J Z S-VOLs and you include BC Z pairs
in a status other than “DUPLEX” or “PENDING” in the CG, you cannot maintain BC Z S-VOL
consistency.
Supported pair statuses for consistency group pair-split
The pair status for all of the BC Z pairs in the CG determines if you can perform a consistency
group (CG) pair-split. If all of the BC Z pairs in the CG are paired (“DUPLEX” status), you can
perform a CG pair-split.
The following table shows when you can perform a CG pair-split, based on the BC Z pairs in the
CG that are not paired (a status other than “DUPLEX”), and the resulting pair status after you
perform the pair-split.
Status after you perform a CG
pair-split
Can you perform a CG pair-split?
The status of the pairs in the CG
that have a status other than
DUPLEX
Split/SUSPOP
YES
PENDING
Split/SUSPOP
YES
2
SP-Pend/TRANS
Split/SUSPOP
YES
2
V-Split/SUSPVS
Split/SUSPOP
YES
2
Split/SUSPOP
The pair statuses remain the same.
NO
Resync/PENDING
The command ends abnormally and shows the
following information:
[EX_CMDRJE] An order to the
control/command device was
rejected
1
The pair statuses remain the same.
NO
Resync-R/REVRSY
The command ends abnormally and shows the
following information:
[EX_CMDRJE] An order to the
control/command device was
rejected
1
The pair statuses remain the same.
NO
Suspend/SUSPER
The command ends abnormally and shows the
following information:
[EX_CMDRJE] An order to the
control/command device was rejected
Notes:
1.
If you share a Cnt Ac-J Z S-VOL and a BC Z P-VOL, the command may end normally after you perform a CG
pair-split. Ensure the status of the pairs within the CG have changed to “Split/SUSPOP” (use the pairdisplay
command).
2.
Consistency is guaranteed only for BC Z pairs in “DUPLEX” or “PENDING” status.
22
Business Copy Z system requirements and planning