Copy Pending Timeout; Rcu Ready Timeout; Group Operations - HP xp12000 User Manual

Copy pending timeout

This group option specifies maximum delay allowed for Continuous Access XP Async copy operations. The
RCU suspends all S-VOLs in the group when:
• The RCU has not had any communications from the MCU within the specified time. This situation might
indicate a disaster or failure at the primary site.
• The RCU has received recordsets from the MCUs but has not been able to settle a particular recordset
within the specified time. This situation might indicate the RCU does not have enough resources to
handle remote copy and I/O workloads.

RCU ready timeout

This group option specifies maximum delay allowed for re-establishing MCU-RCU communications
following MCU power-off. During MCU power-on, the MCU re-establishes communications with all
registered RCUs. If the MCU cannot re-establish communications with an RCU within the specified time, the
MCU suspends all affected Continuous Access XP Asynchronous volume pairs.

Group operations

Continuous Access XP 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
(Pairsplit-r)" on page 97 for a description of the Suspend Range-Group pairsplit-r option.
• Resume (pairresync) all split or suspended pairs in a group. See
volume pairs
Range-Group pairresync option.
• Delete (pairsplit-S) all pairs in a group. See
(Pairsplit-S)" on page 102 for a description of the Delete Range-Group pairsplit-S option.
• Group operations at the RCU:
• Split (pairsplit-r) all pairs in a consistency group. See
(Pairsplit-r)" on page 97 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. See
"Deleting Continuous Access XP volume pairs
Delete Range-C/T pairsplit-S option.
• Delete (pairsplit-S) all pairs in a group regardless of their consistency status. See
Continuous Access XP volume pairs
Range-Group pairsplit-S option.
Continuous Access XP also provides the Error Level pair option (see
and pair options of the Paircreate
consistency group. When a Continuous Access XP Async pair is suspended due to failure (not
user-requested), this Continuous Access XP pair option determines whether all pairs in the same
consistency group are also suspended. If you selected the Group error level for the Continuous Access XP
Async pair, all pairs in the same group are suspended. If you selected the LU error level, only the affected
Continuous Access XP Async pair is suspended.
The Error Level pair option is very important for managing Continuous Access XP Asynchronous groups
and planning disaster recovery. The Group error level should be selected for all Continuous Access XP
Async volumes essential to disaster recovery. Suspended Continuous Access XP 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.
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 XP12000/XP10000.
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
24 Continuous Access XP for the XP12000/XP10000
(Pairresync)" on page 99 for a description of the Continuous Access XP Resume
(Pairsplit-S)" on page 102 for a description of the Delete
pane" on page 95), which triggers automatic suspension of an entire
Table 6 describes Continuous Access XP pair status descriptions. The
"Splitting Continuous Access XP pairs
"Resuming Continuous Access XP
"Deleting Continuous Access XP volume pairs
"Splitting Continuous Access XP pairs
(Pairsplit-S)" on page 102 for a description of the
"Continuous Access XP initial copy
"Deleting