HP XP7 Storage - Manual (Page 78)

S-VOL access P-VOL access Description BCM status RWC status
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When pair status is Pending, neither cache nor shared memory can be added to or removed from the storage system. When
either of these tasks is to be performed, first split any pairs in Pending, status, then resynchronize when the cache or shared
memory operation is completed.
RAID Manager pair status names
RAID Manager pair status names are different than Remote Web Console status names. The
following shows the corresponding names.
RAID Manager pair status name Remote Web Console pair status name
SMPL Unpaired
COPY Pending
PAIR Duplex
PSUS Suspended (by operation)
PSUE Suspended (by error)
Split types
This topic discusses pairs that are split by user operation (Suspended-delete pair to RCU), and
pairs that are suspended by the system because of failure (Suspended).
•
You can split a pair when the initial copy operation is complete.
You must split a pair to perform ICKDSF maintenance on the P-VOL or to access the S-VOL
(read-only mode). Continuous Access Synchronous Z pairs are also split when the CGROUP
FREEZE/RUN command is processed. ◦
◦ When you split a pair, the primary system ensures synchronization by completing any
pending update copy operation according to the user specified drain/purge suspend
optionbefore changing the status to Suspended.
•
Pairs are split by the primary system only, for any of the following reasons:
You released the pair from the secondary system. ◦
◦ An error condition related to the secondary system, the S-VOL, or an update-copy
operation.
◦ When the secondary system cannot run DFW (DASD fast write) to the S-VOL (when the
PPRC DFW-to-S-VOL-Required option is specified).
◦ The primary system cannot communicate with the secondary system.
Split types appear in the Status field on the View Pair Properties window. The following table
describes the split types. (RAID Manager does not display split types.)
Description Volume
applies to Split type
PPRC BCM RWC
The user specified that the pair should be split. This
was done during the pair split operation from the P-VOL SUSPEND(03) SUSPOP(03) Primary Volume
by Operator
primary system by selecting Disable for the Primary
78 Monitoring and maintaining the Cnt Ac-S Z system