topic Re: quarum mode in Operating System - HP-UX

quarum mode

kunjuttan — Tue, 12 Jan 2010 06:27:43 GMT

What is quarum mode and when it is using//

Re: quarum mode

Vishu — Tue, 12 Jan 2010 06:34:03 GMT

Hi Dipesh,

How are you today. When you get up today? i was waiting for you and you only.

Now, can you tell me what is so confusing in this quorom mode which you did not understand. I mean if you tried looking for it yourself first.

Why dont you stop asking such question, like
1) what is it.
2) what is it used for.
3) i dont know why we use it....etc..etc..

if you are using HP-UX, please come up with your problems, doubts or confusions. Providing definition is not the purpose of ITRC. you can get it in man pages itself.

Re: quarum mode

Torsten. — Tue, 12 Jan 2010 06:35:15 GMT

quorum requirement means there must be >50% of disks in a VG available in order to activate the VG.

Let's assume you have a VG with 2 disks configured, 1 failed, you need to override the quorum in order to activate the VG.

http://docs.hp.com/en/B3921-60631/vgchange.1M.html

Re: quarum mode

Horia Chirculescu — Tue, 12 Jan 2010 06:38:42 GMT

Hello,
quorum is the required number of physical volumes that must be available in a volume group to activate that volume group (or to remain activated)

Best regards,
Horia.

Re: quarum mode

kunjuttan — Tue, 12 Jan 2010 06:45:39 GMT

Hi Vishu,
Thanks..Am pretty fine today..any docs pls regarding quorram mode..

Re: quarum mode

Sunny123_1 — Tue, 12 Jan 2010 06:49:30 GMT

Hi

http://docs.hp.com/en/B3921-60631/vgchange.1M.html

Regards
Sunny

Re: quarum mode

SoorajCleris — Tue, 12 Jan 2010 06:53:17 GMT

Hi,

Quorum means minimum requirements in any case and it is always >50 percent.

for example

if you have 4 disks in a VG and 1 is down, you have 75% which > 50% so your quorum is done.

If you have 2 disks and one is down you quorum is not there
because it is = 50%.

so I think you have asked the query about LVM VG quorum,

For activating any VG you need >50% number of disks.

so if you dont have quorum,

you may need to use

vgchange -q n

switch.

Most of the case you will find the problem with the boot VG.If your mirror disk is failed you may need boot the system with quorum mode.

Regards,
Sooraj