HP StorageWorks XP Cluster Extension Software Administrator Guide (T1656-96035, April 2010)

7 XP Cluster Extension recovery procedures
XP disk pair states
Table 3 on page 119 provides basic XP disk pair state information. The XP disk pair state transition
process is complex; see the HP StorageWorks XP Continuous Access and HP StorageWorks XP
Continuous Access XP Journal user guides for more information.
Table 3 XP disk pair states
DescriptionState
The primary (master) disk of a disk pairP-VOL
The secondary (slave) disk of a disk pairS-VOL
A disk with no pair affinity to any other disk
(This could be shown in pairdisplay outputs for your XP Continuous Access Software disk if you accidentally
exported the XP Business Copy Software environment variable HORCC_MRCF. In such a case, the MU
number field will not be empty.)
SMPL
The disk is either a primary disk or a secondary disk. If both (P-VOL and S-VOL) disks are in PAIR state, XP
Continuous Access Software updates the secondary disk based on the primary disk.
If you see only one disk in PAIR state (while the second disk is in another state), one of the following has
occurred:
• The pair affinity on only one site of the disk pair was deleted.
• A takeover command has been invoked on the secondary site, while no data has been written to the
primary site and the XP Continuous Access Software link was down.
• A takeover command has been invoked on the primary site with the fence level configured to DATA to
release the fenced disk, while the XP Continuous Access Software link was down. (The secondary disk
would stay in PAIR state.)
PAIR
The pair affinity has been manually suspended or a takeover operation has been invoked on the secondary
site with the fence level configured to NEVER. (In this case, the secondary disk would have the state
SSUS-SSWS.)
PSUS
The pair affinity has been manually suspended or a takeover operation has been invoked on the secondary
site. In this case, the secondary disk would have the state SSWS if you invoke pairdisplay with the –fc
option. In fence level ASYNC, the disk could also show PFUL or PFUS when using the –fc option.
SSUS
Only the secondary disk could show SSUS. With the –fc option of pairdisplay, you can check whether
somebody manually suspended the pair or a takeover command had been invoked. A prior takeover
command is indicated by the SSWS state. In this case, the secondary disk is mandatory and a
resynchronization can be done only from the S-VOL site.
SSUS - SSWS
The disk is in a failure mode. Either the XP Continuous Access Software link is down, or the disk must be
replaced.
PSUE
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