Adding Drives to a Disk Set

When you add a drive to a disk set, the volume management software repartitions the drive as follows so that the state database for the disk set can be placed on the drive.

• A small portion of each drive is reserved in slice 7 for use by Solstice DiskSuite or Solaris Volume Manager software. The remainder of the space on each drive is placed into slice 0.

• Drives are repartitioned when they are added to the disk set only if slice 7 is not configured correctly.

• Any existing data on the drives is lost by the repartitioning.

• If slice 7 starts at cylinder 0, and the drive partition is large enough to contain a state database replica, the drive is not repartitioned.

How to Add Drives to a Disk Set

Before You Begin

Ensure that the disk set has been created. For instructions, see How to Create a Disk Set.

Steps

1. Become superuser on the node.

2. 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 …

3. Become owner of the disk set.

   # metaset -s setname -t

   -s setname

   Specifies the disk set name

   -t

   Takes ownership of the disk set

4. 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

   ---

   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.

   ---

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

   # metaset -s setname

Example 3–7 Adding Drives to a Disk Set

The metaset command adds the drives /dev/did/rdsk/d1 and /dev/did/rdsk/d2 to the disk set dg-schost-1.

# metaset -s dg-schost-1 -a /dev/did/rdsk/d1 /dev/did/rdsk/d2

Next Steps

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

Otherwise, go to How to Create an md.tab File to define metadevices or volumes by using an md.tab file.