How to convert a VG from Legacy to Agile/persistent DSF

How to convert a VG from Legacy to Agile/persistent DSF

This command is only available as from HP-UX11v3.

A shell script /usr/contrib/bin/vgdsf, can be used to perform the DSF migration of a given volume group. vgdsf uses existing LVM commands - vgdisplay, pvdisplay, vgextend and vgreduce, in addition to the ioscan command to perform the DSF migration. It automatically updates both the /etc/lvmtab and /etc/lvmpvg files to reflect the newer configuration and no additional user action is required. The use of the vgdsf script simplifies the DSF migration operation and the volume group can remain active and in use.

# command to use: vgdsf -c /dev/<vgname>

Summary of steps:

1. strings /etc/lvmtab (The Volume Group configuration is storied in this binary file)

2. cp -p /etc/lvmtab /etc/lvmtab.save (Make a backup of this lvmtab file)

3. vgdsf -c /dev/<vgname> (Convert the VG from legacy to agile addressing)

4.  strings /etc/lvmtab (Verify that the lvmtab file shows the new agile addressing)

e.g. of vgdsf -c /dev/<vgname>

Example:

hpuxhost1:/root # strings /etc/lvmtab

/dev/vg00

/dev/disk/disk2_p2

/dev/disk/disk3_p2

/dev/vg32

/dev/dsk/c25t0d5

/dev/dsk/c19t0d5

/dev/vg33

/dev/dsk/c25t0d6

/dev/dsk/c19t0d6

/dev/vg34

/dev/dsk/c25t0d1

/dev/dsk/c19t0d1

/dev/vg35

/dev/dsk/c25t0d3

/dev/dsk/c19t0d3

hpuxhost1:/etc # vgdsf -c /dev/vg35

Converting legacy DSFs to persistent DSFs in VG /dev/vg35

Persistent DSF /dev/disk/disk37 added to VG /dev/vg35

Legacy DSF /dev/dsk/c19t0d3 removed from VG /dev/vg35

Legacy DSF /dev/dsk/c25t0d3 removed from VG /dev/vg35

hpuxhost1:/etc # strings /etc/lvmtab

/dev/vg00

/dev/disk/disk2_p2

/dev/disk/disk3_p2

/dev/vg32

/dev/dsk/c25t0d5

/dev/dsk/c19t0d5

/dev/vg33

/dev/dsk/c25t0d6

/dev/dsk/c19t0d6

/dev/vg34

/dev/dsk/c25t0d1

/dev/dsk/c19t0d1

/dev/vg35

/dev/disk/disk37