Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Physical Data Replication for ContinentalClusters Using EMC SRDF

Failback Scenarios

Chapter 7350

4. Manually start the ContinentalClusters primary packages at the

primary site using

# cmrunpkg <pkg_name>

# cmmodpkg -e <pkg_name>

The control script is programmed to handle this case. The control

script will issue an SRDF failback command to move the device

group back to the R1 side and to resynchronize the R1 from the R2

side. Until the resynchronization is complete, the SRDF

“read-through” feature will ensure that any reads on the R1 will be

current, by reading data through the SRDF link from the R2 side.

NOTE If the system administrator does not want synchronization

performed from the remote (recovery) site, the device groups should

be split and recreated manually.

5. Ensure that the monitor packages at the primary and recovery sites

are running.

6. Issue the following command:

# symrdf list

to verify device group is synchronized.

7. If the package does not come up, and the device group status is

“failed over,” then manually bring it back using the command:

symrdf -g <symdevgrpname> failback. Example:

# symrdf -g pkgCCB_r1 failback

Execute an RDF ’Failback’ operation for device

group ’pkgCCB_r1’ (y/[n]) ? y

An RDF ’Failback’ operation execution is

in progress for device group ’pkgCCB_r1’. Please wait...

Write Disable device(s) on RA at target

(R2)..............Done.

Suspend RDF

link(s).......................................Done.

Merge device track tables between source and