Host Based Migration Methods

Host-Based Backup and Restore Migration:(Disrutptive)

Here we use an utility to copy an existing disk/lun to a newly provisioned disk/lun. This requires additional storage of equal or greater size than the original lun. The migration will consume CPU cycles on the host.

The application will be offline for the copy duration and will be reconfigured once the copy is done.

1. Make the target LUN available to the host
2. Quiesce/stop the host application
3. Backup the source LUN to the target LUN
4. Reconfigure/Restart the application.

Host based LVM mirror:(Non-Disruptive)

This method also requires additional storage at least the size of the source LUN.There is no disruption to the application. But, host CPU cycles are consumed.

Steps

1. Make the target LUN available to the host
2. Add the target LUN as mirror to the LVM volume containing the source LUN.
3. Break the mirror after the destination is in sync.