HP XP Racks User Manual
Page 21
Guidelines
If you are sharing BC P-VOLs with Cnt Ac-S or Cnt Ac-J S-VOLs, use the following guidelines when
performing a CG pair-split:
•
Maintain a consistent backup of the BC S-VOLs.
For more information about maintaining consistent backups of volumes, see
maintaining consistent Business Copy secondary volume backups” (page 51)
•
Ensure that all BC pairs in the CG are in “PAIR” or “COPY(PD)/COPY”status.
NOTE:
If you share BC pair P-VOLs with Cnt Ac-J S-VOLs and you include BC pairs in a
status other than “PAIR” or “COPY(PD)/COPY” in the CG, you cannot maintain BC S-VOL
consistency.
Supported pair statuses for consistency group pair-split
The pair status for all of the BC pairs in the CG determines if you can perform a consistency group
(CG) pair-split. If all of the BC pairs in the CG are paired (“PAIR” status), you can perform a CG
pair-split.
The following table shows when you can perform a CG pair-split, based on the BC pairs in the
CG that are not paired (a status other than “PAIR”), 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
PAIR
PSUS
YES
COPY(PD)/COPY
PSUS
YES
2
COPY(SP)/COPY
PSUS
YES
2
PSUS(SP)/PSUS
PSUS
YES
2
PSUS
The pair statuses remain the same.
NO
COPY(RS)/COPY
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
COPY(RS-R)/RCPY
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
PSUE
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 S-VOL and a BC 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 “PSUS” (use the pairdisplay command).
2.
Consistency is guaranteed only for BC pairs in “PAIR” or “COPY(PD)/COPY” status.
Splitting pairs using consistency groups
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