This Info Doc will be useful in the following three situations:

• You created a T3 volume containing a standby disk, and now you would like to take that standby disk out of the volume. [You may be doing it so you could use this disk to create another volume with more available disks or perhaps because you don't want your volume to have a standby disk anymore]. You don't want to loose data on the volume.
• You just want to rename your existing volume.
• You removed the volume by mistake and you still know how it was configured. For example a volume was created as follows:
  1. vol add volX data u1d1-4 raid 1 standby u1d9[ Raid 1 volume volX is being created with disks u1d1, u1d2, u1d3, u1d4 and standby disk u1d9 ]
  2. vol init volX data [ Volume volX is initialized now ]
  3. vol mount volX [ Volume is now mounted and can be used as a disk in data applications ]

And now, if you decide to take the standby disk u1d9 out of the above volume, and use it to create another raid volume with other available disks [ lets say u1d6, u1d7, and u1d8 ] and you don't want to loose data on the volume volX.

You can do the following:

1. Make sure that no application is using this volume during the course of this whole operation.[ You will need to unmount any filesystems that are sitting on this volume ].
2. Unmount the volume [ vol unmount volX ]
3. Record the disks that are making this volume. [For example, in our case above, these are u1d1, u1d2, u1d3 and u1d4 ]
4. Remove the volume [ vol remove volX ]
5. Recreate the volume again with just the data disks (and without the standby disk) [vol add volX data u1d1-4 raid 1 ] The following is a very important step
6. Initialize the volume with the .vol command instead of vol command [ .vol init volX fast] <--- note the . before the vol [ Also note that 'fast' is the argument in the vol init command instead of 'data' ]
7. Mount the volume [ vol mount volX ] And now, if you want, you can go ahead and create another volume with the disk u1d9 and any other available disks.

Now the volume volX is ready to be used by the application(s) again and the data has not been lost. The volume is not utilizing the standby disk u1d9 that can be used to create another volume (if needed) with more available disks.

This procedure can also be used to rename a volume. [ For example, use volY in place of volX in above steps 5, 6 and 7 ] or recreate it if it has been removed by mistake.

• Susheel.Chawla@Sun.COM