How to Add Drives to a Disk Set

1. Become superuser on the node.

2. Ensure that the disk set has been created.

   For instructions, see How to Create a Disk Set.

3. List the DID mappings.

   # scdidadm -L

   • Choose drives that are shared by the cluster nodes that will master or potentially master the disk set.

   • Use the full device-ID path names when you add drives to a disk set.

   The first column of output is the DID instance number, the second column is the full physical path name, and the third column is the full device-ID path name (pseudo path). A shared drive has more than one entry for the same DID instance number.

   In the following example, the entries for DID instance number 2 indicate a drive that is shared by phys-schost-1 and phys-schost-2, and the full device-ID path name is /dev/did/rdsk/d2.

   1       phys-schost-1:/dev/rdsk/c0t0d0 /dev/did/rdsk/d1 2       phys-schost-1:/dev/rdsk/c1t1d0 /dev/did/rdsk/d2 2       phys-schost-2:/dev/rdsk/c1t1d0 /dev/did/rdsk/d2 3       phys-schost-1:/dev/rdsk/c1t2d0 /dev/did/rdsk/d3 3       phys-schost-2:/dev/rdsk/c1t2d0 /dev/did/rdsk/d3 …

4. Take ownership of the disk set.

   # metaset -s setname -t

   -s setname

   Specifies the disk set name

   -t

   Takes ownership of the disk set

5. Add the drives to the disk set.

   Use the full device-ID path name.

   # metaset -s setname -a drivename

   -a

   Adds the drive to the disk set

   drivename

   Full device-ID path name of the shared drive

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   Note –

   Do not use the lower-level device name (cNtXdY) when you add a drive to a disk set. Because the lower-level device name is a local name and not unique throughout the cluster, using this name might prevent the metaset from being able to switch over.

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6. Verify the status of the disk set and drives.

   # metaset -s setname

7. (Optional) To repartition drives for use in metadevices or volumes, go to How to Repartition Drives in a Disk Set.

8. Go to How to Create an md.tab File to define metadevices or volumes by using an md.tab file.