topic Re: Server Crash Case in Operating System - HP-UX

Server Crash Case

G V R Shankar — Mon, 24 Sep 2007 10:38:33 GMT

Hello All,

I have two servers say A and B which are of same h/w and they are in cluster. Server A has crashed and the services are up on server B. Now I have to rebuild server A. I don't have a ignite backup of server A, but I have complete full system backup. Could you please tell me what would be the best and fastest way to do this?

What I am planing is to take the secondary disk of Server B and use this disk to rebuild server A and then restore the file system backup. I am not sure if it is possible or not, I am just going with a wierd plan. Kindly guide with detailed steps.

Cheers,

Ravi.

Re: Server Crash Case

Ludovic Derlyn — Mon, 24 Sep 2007 10:43:27 GMT

hi

If you have not an ignite backup , don't try to restore the full system backup

If servers are identical, 2 solutions

1 take the second disk oof server b in mirror
(you must break the mirror before)

2 launch an ignite backup on server B and restore it to server A
during restore specify attributes of server A (hostname, ip adress...)

regards

L-DERLYN

Re: Server Crash Case

Mike Shilladay — Mon, 24 Sep 2007 10:51:02 GMT

Hi,

Ludovic's second solution works a treat, I have done it myself before (though not on machines in a cluster), just make sure that you enter the unique information on first boot or setup in the ignite system information. If the machines are truely identical, it will automatically import the volume groups, however, in a serviceguard cluster the VG's maybe be exclusively owned by server b, in that case you will need to manually import the VG's post ignite.

Hope that helps

Mike

Re: Server Crash Case

G V R Shankar — Mon, 24 Sep 2007 19:55:32 GMT

Hello L-Delyn,

Thanks for the reply.

In the first solution, can I just take the secondary disk out from server B and use ti boot the Server A to single user mode, change the hostname, IP and network info in netconf, hosts file and bring it multi user level. Does it work?

Cheers,
Ravi.

Re: Server Crash Case

skt_skt — Mon, 24 Sep 2007 21:03:10 GMT

the second/ignite method is the most commonly praacticed and having lesser risk involved.

Re: Server Crash Case

Ludovic Derlyn — Tue, 25 Sep 2007 09:24:24 GMT

hi,

Sorry fot the time of response
If you choose solution 1 , which is not the most easy, boot your server without network and execute set_parms initial

don't forget if you choose this,you must recreate mirror disks on the two servers after !
regards
L-DERLYN

Re: Server Crash Case

G V R Shankar — Wed, 26 Sep 2007 09:53:54 GMT

Thanks for the responses. I took the ignite backup of server B and restored on Server A. Every thing looks OK

Cheers
Ravi

Re: Server Crash Case

G V R Shankar — Wed, 26 Sep 2007 09:55:18 GMT

Mentioned in the thread.