Hp StorageWorks XP Remote Web Console Software Uživatelský manuál stáhnout pdf (Strana 168)

Figure 70 Delete Pair Window

TheDeletePairwindow displaysthe 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 forat least oneofthe abovepairs.

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.

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Performing URz Pair Operations

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