Preparing the operating system before a snapshot

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This topic only applies to BAW, and is located in the BAW repository. Last updated on 2025-03-13 12:15

Before you take a snapshot of the operating system, you create a physical volume and logical volume.

About this task

When you prepare for an operating system snapshot, consider the following factors.

The /opt and /home directories must be vacant, because any data in the directory is destroyed when you mount a directory.
You can mount an extra disk with about 10 GB of vacant space and then create a physical volume on it.
After you extend the physical volume to a volume group, you can create the new logical volume in the volume group.

To prepare the operating system before you take a snapshot, complete the following steps:

List the general information (physical volume, volume group, and logical volume) of the Linux® operating system:
```
# pvdisplay
# vgdisplay
# lvdisplay
```
List the disk information:
```
# fdisk -l
```
Create a physical volume on the disk partition, as in the following example:
```
/dev/sda2:  # pvcreate /dev/sda2 /home
```
Extend the new physical volume to the volume group:
```
# vgextend VolGroup00 /dev/sda2 
```

Create a logical volume on the volume group:

# lvcreate -name homebackup -size 10G VolGroup00

Make the file system format for the new logical volume:
```
# mkfs.ext3 /dev/VolGroup00/homebackup
```
Mount the logical volume to the /home directory:
```
# mount /dev/VolGroup00/homebackup/home /home
```

Take a snapshot of the operating system.