Creating Logical Volumes

Adaptive Server supports the fencing of logical volumes and partitions.

See your AIX documentation from IBM for details on these commands.

Note: You must create a volume group from a single logical unit number (LUN). However:

Do not make database devices using LUNs (/dev/rhdisk#) that support existing volume groups and logical volumes.
Do not make volume groups or logical volumes using any LUNs that are currently used as database devices.

Create a volume group on one node using the AIX mkvg command:
```
mkvg -y volume_group_name hdisk#
```
For example: mkvg -y myvolgroup hdisk5
Create a logical volume on one node:
```
mklv -y logical_volume_name volume_group_name size
```
For example: mklv -y mylogicalvol myvolgroup 100M
Clear any disk reservations:
```
/opt/rsct/vsd/bin/prClear hdisk
```
For example: /opt/rsct/vsd/bin/prClear hdisk5
Import the volume groups on the other nodes to align the logical volumes on each node, then configure the logical volume to be created automatically when imported:
```
chdev -l hdisk -a pv=yes
importvg -y volume_group_name hdisk
```
For example:
```
chdev -l hdisk5 -a pv=yes
importvg -y myvolgroup hdisk5
```
Give read and write permission to the logical volume:
```
chmod 666 /dev/rlogical_volume_name
```
For example: chmod 666 /dev/rmylogicalvol