HP StorageWorks XP Remote Web Console Software - Manual (Page 168)

Figure 70 Delete Pair Window
The Delete Pair window displays the following:
• Range: Allows you to specify the release range. The default is Volume if two or more pairs in the
same mirror are selected. The default is Group if not. Also, if the pair status is Simplex, Range is
set to Volume. If the pair status is Deleting or Suspending, Range is set to Group.
• Volume: Only the specified pair(s) will be released. If pairs are selected with Duplex status
and other than Duplex status in the same mirror, an unexpected suspension may occur during
the pair operations (Suspend Pair, Delete(release) Pair, and Resume Pair) under heavy I/O
load conditions. You can estimate whether the I/O load is heavy or not from frequency of
host I/Os. The pair operations should be performed under light I/O load conditions.
• Group: All pairs in the same mirror(s) as the selected pair(s) will be released. Caution: Do not
use this option when releasing pairs at the secondary storage system during disaster recovery.
If the following two conditions are satisfied and you select Apply, a warning message will be
displayed and processing cannot be continued:
• The
Preview list contains two or more pairs belonging to the same mirror.
• The Range column displays Group for at least one of the above pairs.
To be able to continue processing, do either of the following:
• Ensure that the Range column displays Volume for all pairs in the same mirror.
• In
the Preview list, select all but one pair in the same mirror, right click the selected pairs,
and then select Delete.
• Delete Mode: Allows you to specify whether to release the pair(s) forcibly. When the status of
the pair(s) to be released is Simplex or Deleting, the default setting is Force. Otherwise, the
default setting is Normal:
• Force: The pair(s) will forcibly be released even if the primary storage system is unable to
communicate with the secondary storage system. This option may be used to free a host
waiting for device-end from a primary storage system that cannot communicate with its the
secondary storage system, thus allowing host operations to continue.
If you specify Force when the pair status is other than Simplex, Range will be set to Group.
• Normal: The pair(s) will be released only if the primary storage system is able to change the
pair status of the primary and secondary data volumes to Simplex.
• Set: Applies the settings to the Preview list in the Pair Operation window ( Figure 61 on page 148).
• Cancel: Discards the settings.
Creating a Point-in-Time Copy of Data Volumes
URz enables you to make Point-in-Time (PiT) duplicates of groups of volumes. The term "Point-in-Time (PiT)"
refers to an act of obtaining a copy of data immediately when you want to obtain it. The URz can be
used to create a PiT copy of data volumes belonging to a journal group.
To produce a PiT duplicate of data volumes belonging to a journal group:
1. Stop all write I/Os from hosts to primary data volumes in the journal group. Stop all host
updates to all URz primary data volumes in the group.
168 Performing URz Pair Operations