< Previous  | TOC | Index | Next  >

Encapsulating a volume

The following example illustrates how to encapsulate a volume.

 To encapsulate a volume

1. List the volumes:

# vxvset list myvset

VOLUME INDEX LENGTH STATE CONTEXT

vol1 0 102400 ACTIVE -

vol2 1 102400 ACTIVE -

The volume set has two volumes.

2. Create a third volume and copy the passwd file to the third volume:

# vxassist make dbvol 100m

# dd if=/etc/passwd of=/dev/vx/rdsk/rootdg/dbvol count=1

1+0 records in

1+0 records out

The third volume will be used to demonstrate how the volume can be accessed as a file, as shown later.

3. Create a file system on the volume set:

# mkfs -t vxfs /dev/vx/rdsk/rootdg/myvset

version 7 layout

204800 sectors, 102400 blocks of size 1024,

log size 1024 blocks

largefiles supported

4. Mount the volume set:

# mount -t vxfs /dev/vx/dsk/rootdg/myvset /mnt1

5. Add the new volume to the volume set:

# vxvset addvol myvset dbvol

6. Encapsulate dbvol:

# fsvoladm encapsulate /mnt1/dbfile dbvol 100m

# ls -l /mnt1/dbfile

-rw------- 1 root other 104857600 May 22 11:30 /mnt1/dbfile

7. Examine the contents of dbfile to see that it can be accessed as a file:

# head -2 /mnt1/dbfile

root:x:0:1:Super-User:/:/sbin/sh

daemon:x:1:1::/:

The passwd file that was written to the raw volume is now visible in the new file.

  Note   If the encapsulated file is changed in any way, such as if the file is extended, truncated, or moved with an allocation policy or resized volume, or the volume is encapsulated with a bias, the file cannot be de-encapsulated.