Split types

Pairs can be split by user operation or suspended by the storage system because of an error condition. You can split a pair when the initial copy operation is complete.

You must split a pair to access a volume which has the Secondary Volume Write option enabled. TrueCopy for Mainframe pairs are also split when the CGROUP FREEZE command is processed. To synchronize data of the primary and secondary sites after the split, complete the update copy operation before splitting a pair.

Pairs are split by the primary storage system only, for any of the following reasons:

• You released the pair from the secondary storage system.
• An error condition related to the secondary storage system, the S-VOL, or an update-copy operation occurred.
• When the secondary storage system cannot run DFW (DASD fast write) to Secondary Volume (only when "disable" is set for the -dfw_svol option of the raidcom add remote_copy_pair command).
• The primary storage system cannot communicate with the secondary system.

The following table describes the split types of BCM and PPRC.