HP XP Continuous Access Software - Manual (Page 329)

HA Failover and failback 329
XP256 microcode 52-47-xx and over
XP512/48 microcode 10-00-xx and over
XP1024/XP128
XP10000
XP12000
With newer firmware, a horctakeover results in a SSWS state S-VOL so
that a delta copy is all that is required at failback. This functionality is
known as “fast failback” and is accomplished via the –swaps|p option to
pairresync
.
SVOL SVOL-SSUS takeover or swap-takeover
In case of a host failure, this function will execute
swap-takeover.
In case of an ESCON/FC link or P-VOL site failure,
this function will execute SVOL-SSUS-takeover.
SVOL_E Execute SVOL-SSUS takeover and return
EX_VOLCUR
SVOL_E* Return EX_VOLCUR
When the horctakeover command execution succeeds, the state transitions
(
→) to that of the shown line number.
For instance, if the HA control script sees svol_pair at the local volume and
pvol_pair at the remote volume (as in State 16), it performs a
swap-takeover that results in a State 12 situation.