HP StorageWorks Continuous Access XP user guide for the XP10000/XP12000 (December 2005)

80 Continuous Access XP for the XP10000/XP12000
3. From the Consistency Group list, click the consistency groups to be deleted. Select more than one
consistency group with MCU in the This CU column.
4. Right-click, click CT Group Operation, and click Delete CT Group. The list changes to the Consistency
Group Settings Parameter list. If the Delete CT Group command is not enabled, the selected group still
contains P-VOLs in this MCU.
NOTE: After being set, options can be modified and canceled (see ”Modifying parameters and
deleting consistency groups” on page 81).
5. Click Apply on the Continuous Access XP main pane to apply the deletion to the disk array.
Asynchronous copy option
When the Async Option command is selected, the Async Option pane appears. Use the Async Option
pane to specify Continuous Access XP asynchronous copy option parameters for the connected disk array.
Async options apply to the entire physical control unit, including all Continuous Access XP P-VOLs and
S-VOLs behind the control unit.
Figure 47 Async Option pane
All default settings indicate the current settings.
• Pending Update Data Rate (%): Continuous Access XP Asynchronous sidefile threshold, which is
maximum amount of cache that can be used for storing Continuous Access XP Async recordsets
(sidefiles). Select any value between 30% and 70% (10% increments) (see ”Inflow control of
recordsets” on page 22).
The current pending update data rate is common to both Continuous Access XP and TC390 operations.
The most recently entered value is applied to all TrueCopy Async operations.
If one or more consistency groups exist, this setting cannot be changed. This setting can only be
changed when no CT groups are assigned.
You can specify the Pending Update Data Rate from the Async Option pane of TC390. If the specified
Pending Update Data Rate is less than the I/O Delay Start or I/O Delay Increase specified from the
Async Option pane of Continuous Access XP, the Pending Update Data Rate is available.
• Offloading Timer (sec.): Amount of time (0-255 seconds) the MCU waits to send a Continuous Access
XP Async recordset to the RCU. The MCU suspends all affected Continuous Access XP Async volume
pairs if it cannot offload a recordset to the RCU within the specified time (for example, the RCU is still
responding channel-command-retry).
The offloading timer should be set to less than the HBA I/O timeout value.