HP XP Continuous Access Software - Manual (Page 25)

Continuous Access XP user guide for the XP1024/XP128 25
Continuous Access XP volume pair status
Continuous Access XP displays pair status for each volume in the selected logical CU image (CUI) of the
connected XP1024/XP128. Table 5 describes Continuous Access XP pair status descriptions. The MCU
maintains the status of the P-VOL and can change the pair status of the P-VOL and S-VOL. The RCU
maintains the status of the S-VOL and can change the pair status of the S-VOL but not the P-VOL. The MCU
detects when the RCU changes the S-VOL status (if path status is normal) and changes the P-VOL status
accordingly. You can display detailed pair status information using the Command View XP or XP Remote
Web Console GUI (Continuous Access XP Pairdisplay pane) or UNIX®/PC server host (RAID Manager
Pairdisplay command).
A volume not assigned to a Continuous Access XP pair has status SMPL. When a Continuous Access XP
pair is started, the MCU changes the status of the P-VOL and S-VOL to COPY. When the initial copy
operation is complete, the MCU changes the status of both volumes to PAIR. When you split a Continuous
Access XP pair (pairsplit-r), the MCU/RCU changes the status of the P-VOL and S-VOL to PSUS (if path
status is normal). When a pair is suspended due to an error condition, the MCU/RCU changes the P-VOL
and S-VOL status to PSUE (if path status is normal). When you delete a pair from the MCU (pairsplit-S), the
MCU changes the status of the P-VOL and S-VOL to SMPL (if path status is normal). When a pair is deleted
from the RCU, the RCU changes the S-VOL status to SMPL, and the MCU detects the pair deletion (if path
status is normal) and changes the P-VOL status to PSUS.
When a Continuous Access XP pair is split or suspended, the MCU generates a service information
message (SIM) to notify the hosts. This SIM results in a trap indicating the reason for suspension.
Continuous Access XP LUSE pair status
For Continuous Access XP LUSE pairs only, PDUB (dubious) status indicates the status of the Continuous
Access XP LUSE volume pair is COPY or PAIR, but the status of one or more individual LDEV pairs within
the Continuous Access XP LUSE pair is SMPL or PSUE (due to some error condition).
Continuous Access XP Asynchronous pair status
The Suspending and Deleting transitional states occur when a request to change Continuous Access XP
Async pair status is accepted, but the change to the requested status (PSUS, PSUE, or SMPL) is not yet
complete. These states are not reported to the host. For Suspending, you and the MCU can request the
status change. For Deleting, only you can request the status change. If you requested the status change,
the final status is reported at the end of the transition. If an error caused the status to change to PSUE, the
suspended status is reported at the beginning of the transition.
Table 5 Continuous Access XP Asynchronous pair status descriptions
Pair status Description P-VOL access S-VOL access
SMPL
(simplex)
Volume is not currently assigned to a Continuous
Access XP volume pair. When this volume is
added to a Continuous Access XP pair, its status
changes to COPY.
Read/write Read/write
COPY Initial copy operation for this pair is in progress.
This pair is not yet synchronized. When initial
copy is complete, the status changes to PAIR.
Read/write Read only
PAIR Pair is synchronized. Updates to the P-VOL are
duplicated on the S-VOL.
Read/write Read only