Mirroring a logical volume in hp-ux

There are three different methods/ways to mirror logical volume in hp-ux.

1) Using the dfault value you can extend your logical volume -

# lvextend -m 1 /dev/vgname/lvolName

This is simple hp-ux mirroring. LVEXTEND will mirror the logical volume to the next immediate disk/LUN e.g. cxtxdx

2) Assuming you want to mirror you logical volume on a specific disk/LUN.

# lvextend -m 1 /dev/vgname/lvolname /dev/dsk/cxtxdx

Mirror logical volume to the given disk/LUN e.g. cxtxdx

Using “lvdisplay /dev/vgname/lvolname -v” , you can confirm if your logical volume is mirrored to the disk as defined in lvextend.

3) The third method involves amending/creating /etc/lvmpvg

# vi /etc/lvmpvg

This will allow you to have a strict policy (see # man lvextend) for mirroring using Physical Volume group file.

# cat /etc/lvmpvg

PVG     /dev/vgname
PVG     PVG
/dev/dsk/c0t1d0
/dev/dsk/c0t1d1
/dev/dsk/c0t1d2
PVG     PVGm1 (Mirror PV)
/dev/dsk/c1t2d0
/dev/dsk/c1t2d1
/dev/dsk/c1t2d2

From the above example, the first 3 devices in the lvmpvg file are the primary devices. The next 3 devices in the lvmpvg file are the mirror devices.

# mount /dev/vgname/lvolname (make sure the file system is mounted)

#lvchange -a g /dev/vgname/lvol  (you are telling the logical volume to use lvmpvg file)

This will force the logical volume to create mirror on to another set of 3 devices as defined in lvmpvg file – under PVGm1.

So, now if you use lvxtend without any device names, it should create a mirror on the devices as defined under PVGm1.

#lvextend -m 1 /dev/vgname/lvol – (This should create a mirror on PV in PVGm1 group)

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