HP XP Business Copy Software - Manual (Page 29)

Business Copy XP user guide for the XP128/XP1024 29
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 8 At-time Split Function (Specifying the Split Time)
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 ”
Cascade
function ” on page 25) 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.
2. Execute the pairsplit command on the new BC At-Time Split pairs.
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 ” Performing BC operations ” on page 43) from the Command
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). If you use the At-Time Split function, the
pairs are split with Quick Split.
• 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 ” Volume list ” on page 38).
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.