HP StorageWorks Continuous Access XP user guide for the XP10000/XP12000 (December 2005)

Continuous Access XP user guide for the XP10000/XP12000 97
When the Pairsplit-r pane closes, the list changes to the Pair Settings Parameter list (Pairsplit-r).
Figure 54 Pair Settings Parameter list (Pairsplit-r)
The Pair Settings Parameter list (Pairsplit-r) displays the following information for selected pairs:
• Port, Group (TID), and LUN of the LU in the connected disk array.
• S/N and SSID of the RCU (MCU if connected to the RCU).
• S-VOL Wrt: Disable or enable. Enable means the S-VOL is available to receive read and write I/Os.
• Kind: S-VOL or P-VOL Failure. Type of suspend operation.
• Range: Split pairs in what measure: Group or LU (Async only).
• Mode: Drain or purge pairsplit-r option (Async only).
Resuming Continuous Access XP volume pairs (Pairresync)
While a Continuous Access XP pair is split or suspended, the MCU does not perform update copy
operations to the S-VOL.
• For a split/suspended Continuous Access XP Synchronous pair, the MCU may or may not continue
accepting write I/Os for the P-VOL, depending on the P-VOL fence level and pairsplit options (if
user-requested) (see ”Creating Continuous Access XP volume pairs (Paircreate)” on page 90 and
”Splitting Continuous Access XP pairs (Pairsplit-r)” on page 94).
• For a split/suspended Continuous Access XP Async pair, the MCU and RCU tracks recordsets
discarded during pairsplit/suspension, and the MCU continues accepting write I/Os for the P-VOL. The
MCU tracks P-VOL cylinders updated while the pair is split/suspended.
If the RCU accepts write I/Os for a split S-VOL (S-VOL write enable), the RCU also tracks S-VOL cylinders
updated. When the split/suspended pair is resumed, the MCU merges the P-VOL and S-VOL cylinder
bitmaps to determine out-of-sync cylinders.
Use the Pairresync command to resume split/suspended Continuous Access XP pairs. When the Pairresync
command is selected, the Pairresync pane appears. Use the Pairresync pane to change pair options, and
select the resync range option (asynchronous) for selected pairs.
NOTE: Resyncing suspended LDEV pairs within a Continuous Access XP LUSE pair is not supported.
Figure 55 Pairresync pane