Enabling The At-Time Split Function Using Raid Manager; Overview Of At-Time Split Function - HP StorageWorks XP10000 User Manual

When the At-Time Split function is enabled, data in all P-VOLs in the same consistency group is copied to
the corresponding S-VOLs when the disk array receives the pairsplit request from the host server. The
following figure shows an overview of the At-Time Split function.
Figure 13

Overview of At-Time Split function

Enabling the At-Time Split function using RAID Manager

1. Create BC At-Time Split pairs as follows:
a. Define a consistency group for BC pairs. You cannot define L1 and L2 cascade pairs (see
function" on page 31) sharing the same node volume in a consistency group. If you specify such
pairs in the same consistency group, the paircreate command will be rejected.
b. Specify the At-Time Split option.
c. Execute the paircreate command.
Execute the pairsplit command on the new BC At-Time Split pairs.
2.
The At-Time Split option is enabled, and data in all P-VOLs in the same consistency group is copied to
the corresponding S-VOLs when the disk array receives the pairsplit request.
NOTE:
• You can perform BC pair operations (see
View XP management station or XP Remote Web Console on the BC At-Time Split pairs created by
RAID Manager; however, the At-Time Split option is disabled (the pairsplit operation does not ensure
creating S VOLs of the P-VOLs in the same consistency groups).
• When the RAID Manager pairsplit operation ends abnormally, all BC pairs in the same consistency
group are suspended (status = PSUE).
• When the host server is down or has failed, a consistency group with no BC pairs can be defined. If
you execute the paircreate command with the At-Time Split option (-m) under these conditions, the
paircreate command might be rejected. In this case, first find a consistency group number that is not
used by any pairs on the BC main screen by sorting the CTG column (see
Next, specify the consistency group number explicitly, and execute the paircreate command with the
At-Time Split option using RAID Manager on the host server.
• Do not mix pairs created with the At-Time Split option and pairs not created with the At-Time Split
option in the same group defined in the RAID Manager configuration file. If you mix these two types of
pairs, the pairsplit operation might terminate abnormally, or the S-VOLs of the P-VOLs in the same
consistency group might not be created correctly when the pairsplit request is received.
• If you use the At-Time Split function to split a pair, you can select Quick Split or Steady Split.
"Performing BC operations" on page 57) from the Command
Business Copy XP user guide for the XP10000/XP12000
"Cascade
"Volume list" on page 51).
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