Asynchronous Copy Option; Async Option Pane - HP StorageWorks XP12000 User Manual

NOTE:
After being set, options can be modified and canceled (see
deleting consistency
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 44 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
recordsets).
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 Continuous Access XP 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.
groups).
Modifying parameters and
Inflow control of
Continuous Access XP user guide
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