Adding Disk Drives to a Diskset

When you add a disk drive to a diskset, Solstice DiskSuite/Solaris Volume Manager repartitions the disk drive as follows so that the state database for the diskset can be placed on the disk drive.

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

• Disk drives are repartitioned when they are added to the diskset only if slice 7 is not configured correctly.

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

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

How to Add Disk Drives to a Diskset

1. Become superuser on the node.

2. Ensure that the diskset has been created.

   For instructions, see How to Create a Diskset.

3. List the DID mappings.

   # scdidadm -L

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

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

   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 disk 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 disk 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 diskset.

   # metaset -s setname -t

   -s setname

   Specifies the diskset name

   -t

   Takes ownership of the diskset

5. Add the disk drives to the diskset.

   Use the full device-ID path name.

   # metaset -s setname -a drivename

   -a

   Adds the disk drive to the diskset

   drivename

   Full device-ID path name of the shared disk drive

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   Note –

   Do not use the lower-level device name (cNtXdY) when you add a disk drive to a diskset. 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 diskset and disk drives.

   # metaset -s setname

7. Do you intend to repartition disk drives for use in metadevices or volumes?

   • If yes, go to How to Repartition Disk Drives in a Diskset.

   • If no, go to How to Create an md.tab File to define metadevices or volumes by using an md.tab file.

Example—Adding Disk Drives to a Diskset

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

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