HP StorageWorks XP Remote Web Console Software - Manual (Page 23)

Group operations
XP Continuous Access Asynchronous provides the following group-based operations to simplify
and expedite disaster and failure recovery procedures:
•
Group operations at the MCU:
Split (pairsplit-r) all pairs in a consistency group. See “Splitting XP Continuous Access
pairs (Pairsplit-r)” (page 104) for a description of the Suspend Range-Group pairsplit-r
option.
◦
◦ Resume (pairresync) all split or suspended pairs in a group. See “Resuming XP Continuous
Access volume pairs (Pairresync)” (page 107) for a description of the XP Continuous Access
Resume Range-Group pairresync option.
◦ Delete (pairsplit-S) all pairs in a group.
•
Group operations at the RCU:
Split (pairsplit-r) all pairs in a consistency group. See “Splitting XP Continuous Access
pairs (Pairsplit-r)” (page 104) for a description of the Suspend Range-Group pairsplit-r
option.
◦
◦ Delete (pairsplit-S) all split or suspended pairs in a consistency group except inconsistent
pairs.
◦ Delete (pairsplit-S) all pairs in a group regardless of their consistency status.
XP Continuous Access also provides the Error Level pair option (see “XP Continuous Access initial
copy and pair options of the Paircreate pane” (page 103) ), which triggers automatic suspension of
an entire consistency group. When an XP Continuous Access Async pair is suspended due to failure
(not user-requested), this XP Continuous Access pair option determines whether all pairs in the
same consistency group are also suspended. If you selected the Group error level for the XP
Continuous Access Async pair, all pairs in the same group are suspended. If you selected the LU
error level, only the affected XP Continuous Access Async pair is suspended.
The Error Level pair option is very important for managing XP Continuous Access Asynchronous
groups and planning disaster recovery. The Group error level should be selected for all XP
Continuous Access Async volumes essential to disaster recovery. Suspended XP Continuous Access
Async S-VOLs with the LU error level should not be used for disaster recovery because they are
not consistent with the rest of the volume group.
XP Continuous Access volume pair status
XP Continuous Access displays pair status for each volume in the selected logical CU image (CUI)
of the connected array.
“XP Continuous Access Asynchronous pair status descriptions” (page 24)
describes XP Continuous Access 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 XP Command View Advanced Edition
management station or XP Remote Web Console GUI (XP Continuous Access Pairdisplay pane) or
UNIX®/PC server host (RAID Manager Pairdisplay command).
A volume not assigned to an XP Continuous Access pair has status SMPL. When an XP Continuous
Access 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 an XP Continuous Access 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
XP Continuous Access volume pair status 23