Hitachi ShadowImage for Mainframe User Guide: HP XP24000 Disk Array, HP XP20000 Disk Array (T5213-96032, May 2011)

Figure 8 ShadowImage for Mainframe Pair Status Transitions
If a volume is not assigned to an SIz pair, its status is simplex.
1. Select the simplex volumes for S-VOL and T-VOL to create an SIz pair. When you create an
SIz pair, the initial copy operation starts. During the initial copy operation, the status of the
S-VOL and T-VOL changes to pending.
2. When the initial copy operation is complete, the pair status becomes duplex. When the initial
copy is completed, the differential data between the S-VOL and the T-VOL will be copied by
the update copy.
3. There are two kinds of pair status (split and suspend) when the pair is not synchronized.
• When you split a pair (pairsplit), the pair status changes to split.
During the pairsplit process, the pair status becomes SP-pending. Note that if you specify
Quick Split pairsplit, the pair status becomes V-Split during the process. When the split
Pair Status 21