3.7.1 Disk Group Expansion

The following procedure is one method of adding disks to a disk group.

You may find that the CVM software offers many ways to produce the same result. Choose the method with which you feel the most comfortable.

There are now five disk groups in your cluster system, with two disks in each of the disk groups.

To inventory your disk resources, enter:

# vxdisk list

For example, presume that the command shows there are two free disks, c1t0d1 and c2t0d1.

1. Initialize the disks.

   # /etc/vx/bin/vxdisksetup -i c1t0d1 # /etc/vx/bin/vxdisksetup -i c2t0d1

2. Add disks into an existing disk group:

   The command syntax is:

   # vxdg -g disk_group_name adddisk devices ...

   For the present example, the command is:

   # vxdg -g acct adddisk c1t0d1 c2t0d1

3. View the new expanded disk group.

   The command syntax is:

   # vxprint -g disk_group_name

   For the present example, the command would be:

   # vxprint -g acct TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0 dg acct acct - - - - - - dm c1t0d0 c1t0d0s2 - 2050272 - - - - dm c1t0d1 c1t0d1s2 - 2050272 - - - - dm c2t0d0 c2t0d0s2 - 2050272 - - - - dm c2t0d1 c2t0d1s2 - 2050272 - - - - v vol01 gen ENABLED 1024000 - ACTIVE - - pl vol01-01 vol01 ENABLED 1024128 - ACTIVE - - sd c1t0d0-01 vol01-01 ENABLED 1024128 0 - - - pl vol01-02 vol01 ENABLED 1024128 - ACTIVE - - sd c2t0d0-01 vol01-02 ENABLED 1024128 0 - - -

4. Create mirrored volumes.

   The command syntaxes are:

   # vxassist make vol_name length disk_name # vxassist mirror vol_name disk_name

   For the present example:

   # vxassist make newvol 100m c1t0d1 # vxassist mirror newvol c2t0d1