HP XP RAID Manager Software - Manual (Page 109)

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The RAID Manager hide mode (-m noread) is not supported for S-VOLs (V-VOLs). If you specify
it, the paircreate completes normally, but the hide mode is ignored.
•
When using an HP-UX host server, you must create the SS pair before you run the command
for recognizing the device or V-VOL on the host server.
CAUTION: If a volume is recognized by the HP-UX host server, do not use the volume as a
V-VOL. Otherwise an error occurs and the host server can terminate.
For more information about recovering a terminated HP-UX host server, see
“Recovering a
terminated HP-UX host server” (page 55) .
From a command prompt, run the RAID Manager paircreate command. The pair status changes
to “PAIR”.
For more information, see the HP XP P9000 RAID Manager Installation and Configuration User
Guide.
Creating pairs in a consistency group
This topic provides a summary of the steps needed to create pairs in a consistency group. For more
information about creating pairs, see the HP XP P9000 RAID Manager Installation and Configuration
User Guide.
Prerequisite information
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Use different consistency groups for each pair sharing a P-VOL.
•
Review the system requirements for consistency groups. For more information, see “Consistency
group system requirements” (page 11) .
•
Review the consistency group information. For more information, see the HP XP P9000 RAID
Manager Installation and Configuration User Guide.
•
In the same RAID Manager configuration file consistency group, do not mix pairs that you
have created using the At-Time Split operation with other pairs. If you mix these pairs, the
pairsplit
command terminates abnormally and the integrity of stored SS data cannot be
ensured.
1. From a command prompt, run the paircreate command.
Include the option for specifying the consistency group number.
NOTE: Specifying a consistency group number automatically enables the At-Time Split
operation.
2. Add more pairs to the same consistency group by running the paircreate command and
specifying the same consistency group number defined in Step 1.
Splitting pairs
Splitting a pair creates a virtual point-in-time copy of the P-VOL. The following occurs when you
split a pair:
•
The P-VOL continues receiving updates from the host, but updates are not reflected in the
V-VOL.
•
The current P-VOL data blocks are copied to the data pool. Pointers in the V-VOL follow this
original data to the data pool, maintaining the point-in-time copy.
You can split one pair or multiple pairs belonging to a consistency group.
Prerequisite information
•
The pair must be in “PAIR” status.
•
If you the P-VOL is paired with two or more V-VOLs, the pairs cannot be in “COPY(RS-R)/RCPY”
status. Running the pairsplit operation while the pair is in this status can abnormally end the
operation.
Splitting pairs 109