Managing Shared Disks

Setting up twin-tailed physical disks

Follow these steps to migrate virtual shared disk data to a twin-tailed recoverable virtual shared disk.

1. Bring down any application that uses the old virtual shared disks for the duration of this migration.
2. Suspend, stop, and unconfigure all virtual shared disks involved.
3. Add the new physical disks to your hardware configuration, using the instructions that came with them.
4. Create the new volume groups, logical volumes, and virtual shared disks.
5. Perform test reads and writes to make sure you've successfully created your new virtual shared disks.
6. Copy your data from your existing (old) virtual shared disks to the newly-defined virtual shared disks by copying the data directly from one logical volume to the other, using the new volume group name. For example:

   cplv [-v new_volume_group]-y new_logical_volume \
   old_logical_volume
   

7. After making sure that the data is copied to the new logical volume, remove the old virtual shared disk.
8. Issue a reset to make all the virtual shared disks in the configuration active and start the IBM Recoverable Virtual Shared Disk subsystem.

Note:

If you are using data striping, the process of creating the new hashed shared disks also creates the underlying virtual shared disks.