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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
Cascade function) 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)fromtheCommandViewXP
managementstationorXPRemoteWebConsoleontheBCAt-TimeSplitpairscreatedbyRAID
Manager;however,theAt-TimeSplitoptionisdisabled(thepairsplitoperationdoesnotensure
creatingSVOLsoftheP-VOLsinthesameconsistencygroups).
• 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
youexecutethepaircreatecommandwiththeAt-TimeSplitoption(-m)undertheseconditions,the
paircreate command might be rejected. In this case, first findaconsistencygroupnumberthatisnot
used by any pairs on the BC main screen by sorting the CTG column (see Volume list). Next, specify
theconsistencygroupnumberexplicitly,andexecutethepaircreatecommandwiththeAt-TimeSplit
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.
Business Copy XP user guide
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