Hp StorageWorks XP Remote Web Console Software Bedienungsanleitung PDF herunterladen (Seite 97)

When either of the abovementioned requirements is not fulﬁlled, usually an error occurs and delta

resync operation will fail. Especially in the following cases, delta resync operation will not be performed

since the necessary journal data does not exist:

• When the primary data volume in the URz pair for delta resync operation is updated after

creating the URz pair, but URz primary data volumes that are also used as TCz Synchronous

primary data volumes are not updated in the primary site

• When the volumes in the primary site are updated after splitting TCz Synchronous pair

• When the secondary data volume is updated after splitting URz pair

• As a result of the update of the primary data volume after splitting URz pair, when the capacity of

the journal data exceeds 70% of the journal volume in TCz Synchronous secondary site

• When the primary data volume in the URz pair for delta resync operation is updated and then

the capacity of the journal data exceeds 70% the journal volume in the primary site of URz pair

for delta resync operation

• When no volumes (including volumes after failover or failback) in the primary site are updated

after creating the URz pair for delta resync operation

• When delta resync operation is performed within about one minute after a volume in the primary

site is updated after the URz pair for delta resync operation is created

Note:

By specifying an option, you can copy the whole data in the primary volume to the secondary

volume and avoid the error when only a part of the differential data between primary and secondary

data volume is stored in the journal volume. For detailed information about the option, see

“Changing Options for a Journal Group” on page 138.

Recovering from Failures in the Primary Site

If you follow the operation procedure in

“Recover

ing from Failures in the Primary Site and the TCz Synchronous Secondary Site” on page 104

and then

the system does not change to 3DC cascading conﬁguration, you can change the system into

3DC mult

i-target conﬁguration after removing failures from the primary site and other locations, The

result

ing 3DC multi-target system uses the former TCz secondary volume as a primary volume.

To chan

ge the system into 3DC multi-target conﬁguration:

1. Use Business Continuity Manager to execute the YKDELETE command on the journal group

corresponding to the former URz pair.

NOTE:

YKDELETE is a command for releasing a pair.

2. If pair resynchronization has not been performed to reverse the primary volume and the remote

volume of the TCz Synchronous pair (i.e., if the pair is suspended), use Business Continuity

Manager to execute the YKRESYNC command, so that the copy direction of the TCz Synchronous

pair will be reversed.

NOTE:

YKRESYNC is a command for re-establishing a pair.

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