HP XP Racks - Manual (Page 30)

Pair status before and after a split operation
Pairs in the same consistency group must be in PAIR/Duplex status when you begin the split
operation in order to maintain consistency. Otherwise, when the operation completes, pair status
will be inconsistent.
This is shown in the following table, in which font angle indicates the following:
•
Italics font: Pair status before the split operation on the consistency group
•
Regular font: Status after the split operation
Cnt Ac-S Z pairs Pair statuses
All = Suspend Some = Duplex, some = Suspend All = Duplex
Cnt Ac-S: PSUS Cnt Ac-S: PSUS Cnt Ac-S: PSUS All = PAIR Cnt
Ac-S
pairs
Cnt Ac-S Z: Suspend Cnt Ac-S Z: Suspend Cnt Ac-S Z: Suspend
Cnt Ac-S: PSUS Cnt Ac-S: PSUS Cnt Ac-S: PSUS Some = PAIR, some
= PSUS
Cnt Ac-S Z: Suspend Cnt Ac-S Z: Suspend Cnt Ac-S Z: Suspend
Cnt Ac-S: PSUS Cnt Ac-S: PSUS Cnt Ac-S: PSUS All = PSUS
Cnt Ac-S Z: Suspend Cnt Ac-S Z: Cnt Ac-S Z:
- RAID Manager: Duplex/Suspend - RAID Manager: Duplex
- BCM: Suspend - BCM: Suspend
Consistency group 127
When you create pairs using Remote Web Console, they can be assigned to only one consistency
group (CG), 127. (You can also use RAID Manager to assign pairs to CG 127.) With CG 127,
you can ensure the following:
•
When a pair is split or suspended for any reason, you can ensure that all P-VOLs in the group
become suspended.
•
If data paths between the secondary and primary system fail, you can ensure that all S-VOLs
are placed in PSUE status.
For more information, see “CG 127 behavior and restrictions when a pair is suspended” (page 31) .
To assign pairs to CG 127
1.
Turn Function Switch 30 On.
•
Turn on the switch in the primary and secondary system to get the desired result in each
system.
•
Turn on the switch in the system where you want the behavior: either consistent P-VOL
suspensions for the primary system, or consistent S-VOL PSUE status for the secondary
system.
2. Create the pairs and assign them to CG 127.
•
In RAID Manager, assign the pairs to this group number when you create the pairs.
•
In Remote Web Console, pairs are automatically assigned to CG 127 when the pairs
are created and function switch 30 is On.
30 Planning for Continuous Access Synchronous