HP XP Continuous Access Software User Manual
Page 342
342
HP StorageWorks Disk Array XP RAID Manager: User’s Guide
SVOL-takeover in the case of a host failure
After SVOL-takeover changes the S-VOL (only) to suspend (PAIR,
PSUE
→
SSUS) state, the SVOL-takeover will automatically execute the
pairresync –swaps
command to copy data between the new P-VOL and
the new S-VOL. The horctakeover command returns a swap-takeover.
Async-CA specific behavior
Before the S-VOL is changed to SSUS, the SVOL-takeover operation will
copy non-transmitted data (which remains in the P-VOL sidefile) to the
S-VOL. The SVOL-takeover operation waits to attempt to copy all P-VOL
data to the S-VOL before a timeout (specified by the –t timeout option).
After all the P-VOL sidefile data has been successfully copied to the
S-VOL, the SVOL-takeover operation splits the pairs and changes the
S-VOL to SSUS state. The remainder of the operation is the same as for the
non-asynchronous case.
horctakeover
P-VOL
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL
Host C
Host A
Host B
PSUS
PSUS
PSUS
PSUS
PSUS
SSUS
SSUS
SSUS
SSUS
SSUS
P-VOL
S-VOL
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL
P-VOL
Before running APP
internally executes
"pairresync -swap
s