LVM and VxVM

should i required to /etc/lvmtab

 
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unix_admin
Occasional Advisor

should i required to /etc/lvmtab

I am replacing a disk drive that has failed.

Should I move the /etc/lvmtab file out of the way and do
a vgscan to re-create the lvmtab file?


i am very new to this . please bear with me

jerry
4 REPLIES 4
Radhakrishnan Venkatara
Trusted Contributor
Solution

Re: should i required to /etc/lvmtab

hi,

this is some thing to be under stood also.

No, although moving the /etc/lvmtab file out of the way and doing a
vgscan to re-create the lvmtab file is done by some people in any
LVM situation, this statergy is incorrect. Often these steps will
make the situation worse, as in the case of replacing a failed disk.

Generally, there are only three situations that warrant recreation
of the lvmtab file:

- the original file is corrupt.

- There is no vgcfgbackup (mostly HP-UX 9.X).

- The vgcfgbackup is corrupt.

In the case of a disk drive going bad and being replaced, it's very
important to keep the original /etc/lvmtab file intact.

Use these steps when an LVM disk fails:

1. Power system down.

2. Replace disk.

3. Boot system.

4. Restore LVM information to the new disk:

vgcfgrestore -n /dev/vg /dev/rdsk/device

5. Re-activate the VG:

vgchange -a y /dev/vg

If the drive was mirrored, then no other steps are necessary. If
it was not mirrored, then you may have to restore the filesystems
data.

Note: If you had moved the /etc/lvmtab file and created a new one
before using vgcfgrestore to restore to the new disk, then
the lvmtab file will not have the new disk, thus causing
problems.

hope this will help u.

have a nice day

radhakrishnan
Negative thinking is a highest form of Intelligence
malay boy
Trusted Contributor

Re: should i required to /etc/lvmtab

hi,
To replace faulty disk.

Assume that the disk belong to vg03 and the disk is /dev/dsk/c9t9d0.

Do:

1) Halt the system
2) Replace the disk
3)boot
4) vgcfgrestore -n vg03 /dev/dsk/c9t9d0
5) vgchange -a y vg03

if you got mirror do vgsync.

note:don't do anything to your /etc/lvmtab


hope this help

regards
mB
There are three person in my team-Me ,myself and I.
Sunil Sharma_1
Honored Contributor

Re: should i required to /etc/lvmtab

No. you don't require to move lvmtab.
you just have to run vgcfgrestore after replacing disk.

SS
*** Dream as if you'll live forever. Live as if you'll die today ***
Con O'Kelly
Honored Contributor

Re: should i required to /etc/lvmtab

Hi

If you have a support contract with HP then you can get a copy of the "HP-UX Software Recovery Handbook" on the ITRC. Chp 7 on LVM provides excellent procedures for replacing failed disks in all situations (eg root, mirrored, hot swappable etc).

Cheers
Con