topic Re: dual boot in Operating System - HP-UX

dual boot

S. Singaravelu — Tue, 08 Apr 2003 05:48:38 GMT

hello admins,

I was going through the "hpux dual boot" write up that is available in the following link

http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062684551

In the above mentioned link, it is said that we can have two root file system and at the time of upgrade(or)root fs corruption, we can use alternate hp-ux root file system by doing whatever mentioned in the write up

My question is that, in case of unbootable system (only root vol gone corrupt), how can I run "lvlnboot -r " command to make the alternate root file system as a root file system even without booting ?

I think the statement "..to provide a method to
recover in the case of corruption of the 'primary' root file system..." given in the begining of this write up is wrong if the system is not able to boot due to corruption !!

please validate my thoughts !!

thx
-velu

Re: dual boot

Ravi_8 — Tue, 08 Apr 2003 06:03:07 GMT

Hi,

point is that. if the disk A fails to boot
then we can boot with disk B and import the lvols from disk A to disk B and can continue with work

Re: dual boot

S. Singaravelu — Tue, 08 Apr 2003 06:15:14 GMT

hi ravi,
Prabably you haven't carefully gone through the write up !!

thx
-velu

Re: dual boot

Sunil Sharma_1 — Tue, 08 Apr 2003 07:32:46 GMT

Hi Velu,

I do agree with you, it seems they are assuming to use of second volume when first will get corrupted but it's able to boot from corrupted one..

Sunil

Re: dual boot

Balaji N — Tue, 08 Apr 2003 07:34:59 GMT

hi velu,
i guess what you say is correct. this can be used only we need to do some updation and not during a root fs corrupution. (since we will not be able to boot at all).

what does others have to say?
-balaji

Re: dual boot

KapilRaj — Tue, 08 Apr 2003 08:09:02 GMT

velu,

Does'nt mean that u can not boot when root volume is corrupted.

I hv seen nodes which does'nt boot in to multiuser mode but boots into LVM maintanance mode. It depends on what kind of corruption had happend to the disk / lvol.

Document is still valid.

I strongly believe that HPUX does'nt use LVM to address root/boot volumes while it is booting into maintance mode. So any LVM corruption does'nt matter to maintance mode whereas it matter to normal boot.

Correct me if i am wrong

Cheers ......

Kaps

Re: dual boot

S. Singaravelu — Tue, 08 Apr 2003 11:06:48 GMT

hi kapil,

Accepted your point. It all depends on the level of corruption.

But, What all I can do in LVM maintenance mode ?

I guess in LVM maintenance mode, system uses some predefined structure to find out boot filesystem's (lvol1) LVM structure and then it uses "/stand/rootconf" file to determine the root filesystem LVM structure.

I am not sure Whether we can mount the alternate root volume and run lvlnboot to relink the root filesystem in the LVM maintenance mode. "lvlnboot -r " requires volume to be up and running to make it as root volume.

Please confirm, if possible.

thx
-velu