Hp StorageWorks XP Remote Web Console Software Bedienungsanleitung PDF herunterladen (Seite 198)

Switching Opera

tions to the Secondary Site

If a disaster or

failure occurs at the primary site, the ﬁrst disaster recovery activity is to use Business

Continuity Manager to switch your operations to the remote backup site.

The basic procedures for switching operations to the remote backup site are as follows:

If you need to perform an IPL of the secondary host system, please delete SIMs and then perform the IPL

before following the procedure below. When the IPL ﬁnishes, the secondary data volumes will usually be

varied online. If the secondary volume are not varied online, vary the volumes online.

If you do not ne

ed to perform an IPL of the secondary host system, please ensure that the secondary data

volumes are varied online before you follow the procedure below.

1. Check whether the restore journal group includes a secondary data volume whose pair status is

Pending duple

x or Suspend (equivalent to SUSPOP in Business Continuity Manager).

If such a pair

exists, consistency in the secondary data volume is dubious, and recovery with

guaranteed consistency is impossible. In this case, if you want to use the secondary data volume,

you must release the pair.

2. If such a pair

does not exist, use Business Continuity Manager to execute the YKSUSPND

REVERSE opt

ion on the restore journal group (YKSUSPND is a command for splitting a pair).

If an error o

ccurs, consistency in the secondary data volume is dubious, and recovery with

guaranteed consistency is impossible. In this case, if you want to use the secondary data

volume, you must release the pair.

If no error occurs in step 2 on page 198, wait until the splitting ﬁnishes. When the splitting

ﬁnishes, the secondary data volume becomes usable with maintained consistency.

4. When the splitting ﬁnishes, use Business Continuity Manager to execute the YKRESYNC REVERSE

option on the restore journal group (YKRESYNC is a command for restoring a pair). This option

attempts to restore the pair and reverse the primary/secondary relationship.

5. Check wh

ether there is a pair whose pair status of the restore journal group is Suspend

(equivalent to SWAPPING in Business Continuity Manager).

If such a pair does not exist, the pair is successfully restored and the copy direction is reversed, and

then copying of data from the secondary site to the primary site will start.

6. If the YKSUSPND command ﬁnishes successfully and the splitting ends successfully, you can

resume

business tasks (i.e., you can start business applications) by using secondary data volumes

in the

secondary site. Also, if the primary storage system, the secondary storage system, and

remot

e copy connections are free from failure and fully operational, the restoring of the pair will

ﬁnish

successfully, and then copying of data from the secondary site to the primary site will start.

For d

etailed information about how to use Business Continuity Manager and about pair status in Business

Cont

inuity Manager, please refer to Business Continuity Manager User’s Guide.

For d

etailed information about status of data volumes, refer to “Pair Status” on page 45.

Transferring Operations Back to the Primary Site

Once the disaster recovery procedure is ﬁnished and your business applications are running at the

secondary site, the next activity is to restore the primary site and make arrangements for copying data

from the secondary site back to the primary site. The following procedure explains how to use Business

Continuity Manager to copy data from the secondary site to the primary site:

1. Restore the primary storage system and remote copy connections, and make sure that all URz

components are fully operational.

2. At the primary site, locate primary data volumes whose pair status is Pending duplex or Duplex,

and then locate corresponding secondary data volumes whose pair status is Suspend,which is

equivalent to SWAPPING in Business Continuity Manager terminology. If such volume pairs are

found, issue a request for splitting the pairs to the primary data volumes.

198 Disaster Recovery Operations

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