vgchange quorum switch.

[Jonathan Rowbury]

Can anyone confirm to me that it is ok to run the following command on a live system;

vgchange -ay -nq /dev/vg??

I have a pair of disks in this VG mirroring the LV's, the other day there was a power failure which resulted in me having to take the system down, when I brought the system back up the LV's within this VG were not available. I diagnosed the problem as being one of the disks and replaced it, what I want to do now is minimise downtime even more by forcing the system to initialise the LV's within this VG even if one of the disks is down. I believe I have the correct command above, and I want to run it while the system is live (I can't have anymore downtime), can anyone help with an answer.

Many thanks in advance for any response.

[Carlos Fernandez Riera · Accepted solution]

Perfect.

If that VG is boot VG then you need to take same aditional jobs.

Try to search on forum for setboot.

[Dan Hetzel]

Hi Jonathan,

There is no problem running this command online.

Best regards,

Dan Hetzel

[Jonathan Rowbury]

Thank you both for such a quick response.

Carlos, it is not my boot disc, that is in another VG that I want to run this commnad on also. When I added the second disk to my boot VG I used the mkboot command to make the new disk bootable as well.

Thanks again for your answers...

[Carlos Fernandez Riera]

Not only mkboot -a "hpux -lq" on both disks

See:

http://my1.itrc.hp.com/cm/QuestionAnswer/1,1150,0x750260260cafd4118fef0090279cd0f9,00.html

AH: thankyou for my new hat.

[Jonathan Rowbury]

Carlos, I've checked out the thread you recommended and the only step I did not do the same was;

5) Disable quorum checking in order to boot in case of crash on either primary or alternate disk (command applied on both disk).
> mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/cXtXd0

I used the command;

Disable quorum checking in order to boot in case of crash on either primary or alternate disk (command applied on both disk).
> mkboot -a "hpux (;0)/stand/vmunix" /dev/rdsk/cXtXd0 created

Do you have any advice on how I proceed in making the second disk in my boot VG bootable, do I need to start again with this VG!

[Jonathan Rowbury]

Sorry Carlos, I used the command;

mkboot -a "hpux (;0)/stand/vmunix" /dev/rdsk/cXtXd0

this was executed only against the new disk...

[CHRIS_ANORUO]

You can also search the forum using "mirror disk" as your search word.

[CHRIS_ANORUO]

You can also search the forum using "mirror disk" as your search word.
1) pvcreate -B /dev/rdsk/c1t5d0
2) Add a physical Volume vgextend /dev/vg00 /dev/dsk/c1t5d0
3) mkboot /dev/rdsk/c1t5d0
4) mkboot -a "hpux (52.3.0;0)/stand/vmunix" /dev/rdsk/c1t5d0
5) lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c1t5d0 for each logical volume
6) lvlnboot -v for verification
7) lvdisplay -v /dev/vg00/lvol1