Hp XP P9500 Storage User Manual download pdf (Page 92)

circumstances are the same as when a data volume becomes inaccessible due to control unit

failure.

You detect and re-create lost updates by checking database log files and other current information

at the primary site.

Design your recovery plan so that detection and retrieval of lost updates is performed after the

application is started at the secondary site. The detection and retrieval process can take some time.

Prepare for file and database recovery using files for file recovery (for example, database log files

that have been verified as current).

Remote copy and disaster recovery procedures are inherently complex. Consult your HP account

team about recovery procedures.

Switching host operations to the secondary site

These procedures apply to single Cnt Ac-J pairs and Cnt Ac-J systems with multiple primary and/or

secondary P9500 systems.

The first recovery task is to switch host operations to the secondary site using the RAID Manager

horctakeover command.

• The horctakeover command checks the pair status of S-VOLs and splits journals. Splitting the

pairs in the journals ensures consistency and usability in the S-VOLs.

• The horctakeover command attempts to restore pairs to reverse P-VOLs and S-VOLs.

• If the horctakeover command runs successfully, host operations are taken over by the secondary

site using the S-VOLs. For detailed information about RAID Manager and horctakeover, see

the HP XP P9000 RAID Manager User Guide.

Reversing copy direction from secondary to primary sites

When host operations have been switched to the secondary site, restore the primary site and

re-establish the Cnt Ac-J system from secondary to primary sites.

1. Restore the primary system and data paths.

2. Bring up the host servers at the primary site.

3. Make sure that all Cnt Ac-J components are operational.

4. Do all of the following, as applicable:

1. At the primary site, locate P-VOLs whose status is COPY or PAIR. Locate corresponding

S-VOLs at the secondary site whose status is SSWS, which indicates that data is being

written to the S-VOLs. At the primary site, split these pairs.

2. At the primary site, locate P-VOLs whose status is other than SMPL. Locate corresponding

S-VOLs at the secondary site whose status is SMPL. At the primary site, release the pairs.

3. At the primary site, locate pairs whose status is SMPL. At the secondary site, release the

pairs.

5. On pairs that were split and in which S-VOL status is now SSWS, run the pairresync -swaps

command. This reverses P-VOLs and S-VOLs and resynchronizes the pairs. The replication is

from secondary site to original primary site.

NOTE: When you run the pairresync -swaps command, you can use the -d option to specify

a data volume. However, the command is rejected if the restore journal where the data volume

belongs is in Active, Halting, or Stopping status.

6. For S-VOLs whose status is SMPL, recreate the Cnt Ac-J pairs specifying the S-VOLs as P-VOLs.

This creates pairs in which P-VOLs and S-VOLs are reversed.

7. Verify that pair status of all new S-VOLs (which were originally P-VOLs) changes from COPY

to PAIR. When the pair status is changed to PAIR, initial copy operations are finished and

consistency is maintained.

92 Disaster recovery operations

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