Canceling and Resuming Resynchronization With the metasync Command

The resynchronization process affects both the performance of a system, as well as the user's ability to perform tasks. For example, resynchronizations impact the I/O performance and the response time of a system. Additionally, during a resynchronization process, a disk set cannot be released from a host. In another example, if a volume is attached by mistake, the volume cannot be released until the resynchronization has completed. Because of situations such as these, allowing a resynchronization process to complete is not always advantageous.

The metasync -c volume command cancels the resynchronization process on a given volume. The following functionality is associated with canceling resynchronization processes:

• Canceled resynchronization processes are logged by using the syslog utility

• After a reboot, any canceled resynchronization process is resumed from the point that it stopped

• When a disk set is taken, any canceled resynchronization process within that disk set resumes automatically from the point of the cancellation

A canceled resynchronization process can be resumed manually from the point that it stopped by issuing the metasync volume command.

For the tasks associated with canceling and resuming resynchroniztion processes using the metasync command, see How to Cancel a Volume Resynchronization Process and How to Resume a Volume Resynchronization Process.