HP StorageWorks XP Remote Web Console Software - Manual (Page 30)

Group Options
XP Continuous Access provides the following options for each consistency group: Time Out (Copy
Pending) and Time Out (RCU Ready). These options are selected when you add a group, and can
only be modified if the group does not contain any P-VOLs in the MCU.
Time Out (Copy Pending). This group option specifies the maximum delay allowed for XP Continuous
Access Asynchronous copy operations. The RCU suspends all S-VOLs in the group when:
•
The RCU has not had any communication from the MCU within the specified time. This situation
could indicate a disaster or failure at the primary site.
•
The RCU has been receiving recordsets from the MCU(s), but has not been able to settle a
recordset within the specified time. This situation may indicate that the RCU does not have
enough resources to handle the remote copy and I/O workloads.
Time Out (RCU Ready). This group option specifies the maximum delay allowed for re-establishing
MCU-RCU communications following an MCU power-off. During an MCU power-on, the MCU
re-establishing communication with all registered RCUs. If the MCU is not able to re-establishing
communication with an RCU within the specified time, the MCU suspends all affected XP Continuous
Access Asynchronous pairs.
Group Operations
XP Continuous Access Asynchronous provides the following group-based operations to simplify
and expedite disaster/failure recovery procedures:
•
Group operations at the MCU:
Split (pairsplit-r) all pairs in a consistency group using the Suspend Range-Group pairsplit
option. ◦
◦ Resynchronize (pairresync) all split or suspended pairs in a group using the XP Continuous
Access Resume Range-Group pairresync option.
◦ Release (pairsplit-S) all pairs in a group using the Delete Range-Group pair release option.
•
Group operations at the RCU:
Split (pairsplit-r) all pairs in a consistency group using the Suspend Range-Group pairsplit
option. ◦
◦ Release (pairsplit-S) all split/suspended pairs in a consistency group except for any
inconsistent pairs using the Delete Range-C/T pair release option.
◦ Release (pairsplit-S) all pairs in a group regardless of their consistency status using the
Delete Range-Group pair release option.
XP Continuous Access also provides the Error level pair option that is used to trigger automatic
suspension of an entire consistency group. When an XP Continuous Access Asynchronous pair is
suspended due to failure (not user-requested), this XP Continuous Access Asynchronous pair option
determines whether all pairs in the same consistency group will also be suspended. If you selected
the Group error level for the XP Continuous Access pair, all pairs in the same group will be
suspended. If you selected the LU error level, only the affected XP Continuous Access pair will be
suspended.
NOTE: The Error level pair option is very important for managing XP Continuous Access
Asynchronous groups and planning for disaster recovery. The Group error level should be selected
for all XP Continuous Access Asynchronous volumes that are essential to disaster recovery.
Suspended XP Continuous Access S-VOLs that have the LU error level should not be used for disaster
recovery.
30 About XP Continuous Access Operations