major no

UNIX AIX
1

hi what is meant by major no in vg

what is meant by concurrent vg

i cant understand these two things

2

Hi Senmak,

the major number of a VG is some kind of an identifier - veritas cluster eg is varying on its volumegroups using the majornumber.

Concurrent vg is a volumegroup imported, varied on and accessed on more than one node at the same time

Kind regards
zxmaus

3

The major number may also refer to the major device number of the special devices in /dev. Logical volumes in the same volume group get the same major number. E.g. in this snippet:

brw-rw----    1 root     system       10, 11 31 Mar 18:19 fwdump
brw-rw----    1 root     system       10,  8 31 Mar 16:21 hd1
brw-rw----    1 root     system       10,  9 31 Mar 16:21 hd10opt
brw-rw----    1 root     system       10, 10 31 Mar 16:21 hd11admin
brw-rw----    1 root     system       10,  5 31 Mar 16:21 hd2
brw-rw----    1 root     system       10,  7 31 Mar 16:21 hd3

Note they all have a major number of 10.

These are all lv's in the rootvg volume group.

4

In cluster environments you should have a look at keeping the Major Numbers for your VGs the same, when doing the importvg. Else you might get error messages or warnings in hacmp.out.