topic DR build for LINUX in Operating System - Linux

DR build for LINUX

Dek_1 — Wed, 01 Apr 2009 09:16:13 GMT

I have 2 HP proliant servers - LIVE and DR
I have backed up the '/' via tar on LIVE;
installed RedHat EL 5 (same as LIVE) on the DR.
Recovered the tape and re-booted.

The LIVE system is connected to an EVA, and now the DR system refused to go past the problem with
/dev/data/backup & /dev/live/live01 - which are the EVA references on my LIVE system.

What is my path forward here ?
Do I need to edit a config file ?
Or should I have setup the EVA before the tape recovery ?

My aim is, if possible, to have a set of straight forward instructions so that an operator could recovery the system onto 'cold iron'
All help, comments appreciated - thanks

Re: DR build for LINUX

Ivan Ferreira — Wed, 01 Apr 2009 12:33:46 GMT

Â¿Have you ever tried mondo rescue? Probably is time to do it.

Â¿Also, what is the error that you get? Ensure that both servers won't ever access the same VDISK at the same time.

Re: DR build for LINUX

Dek_1 — Thu, 02 Apr 2009 08:16:29 GMT

Ivan,
I had tried mondo rescue because it seemed ideal but I kept getting errors - the boot cd was not created and I could not work out why.

This was set up as a scripted task to be done each Sunday - which would be our ideal.

So if you can point me at some pretty basic step by step instructions I would be very pleased.

Our current configuration is 2 completely separate systems (Processors and EVA). These, when built, will be in located at least 100 miles apart with the only link being the network up which rsync will transfer data.

So step by step this is what I have done:
On the LIVE system, I have taken a tar copy onto tape of the '/' file system.

On the DR system, which has had RHEL 5 loaded, I un-tar-ed this tape.
On re-booting the system told me that the 2 file systems specified were invalid and it dropped into Rescue mode.
I will attach the log of the tar tape so you can see what it is that is being recovered.

Re: DR build for LINUX

Dek_1 — Thu, 02 Apr 2009 11:35:38 GMT

Perhaps I need to make clearer what it is that I want to achieve :-

I have 2 servers both HP DL380s
The first, runs RHEL 5 and is a 24/7 system

Both machines have 2 internal 180 Gig disk in RAID 0 configuration.
Both have tape devices attached

Can I user tar/DUMP/???? to take a copy from the 1st machine - the LIVE 24/7 system - onto tape, which I can then use on the second machine :-
a - boot this second system with knoppix
b - recover the tape

and have the second machine as an absolute clone of the first.
I can then edit the second machine to change its IP address, and add in the EVA details - because the EVAs are not identical on both systems - and then recover the EVA data from the standard backup tape.

thanks

Re: DR build for LINUX

Steven E. Protter — Thu, 02 Apr 2009 14:03:57 GMT

Shalom,

I would suggest the following.

Create a working system in production.

Back it up.

Create a kick start file for building the system in the DR location.

You will need an httpd server for the DR site, same hardware and storage and you can change the IP address on the kick start command line.

SEP

Re: DR build for LINUX

Dek_1 — Fri, 03 Apr 2009 09:57:31 GMT

Steven,
You don't think I can clone the server - including the Oracle software; my scripts etc ?

I guess I am looking for an 'ignite' for RHEL ;-)

Re: DR build for LINUX

Court Campbell — Fri, 03 Apr 2009 13:52:41 GMT

I have to agree with Ivan on this one. Mondorescue is an ideal choice. You may want to work out whatever bug you are having with it. I have been using it for a few months and it is very similar to ignite IMO. I have cloned a few machines with it. In my setup I write an ISO file to an NFS server. You can then burn the image to DVD or just setup an NFS server at the DR site and boot from media that has mondorestore.

NOTE: you only want to backup your local system. You will then need to restore anything else from tape.

Re: DR build for LINUX

Court Campbell — Fri, 03 Apr 2009 14:03:16 GMT

Oh, and if you want the machine to be the exact same without any changes just use the nuke or isonuke mode. You may want to look at the man for mondorestore.

Re: DR build for LINUX

Dek_1 — Wed, 08 Apr 2009 10:00:04 GMT

Thanks to all for your help:
The problems I get relate to the Volume groups for the Raid 0 internal disks.

I have now rebuilt the server to O/S level, and will try the mondo again - but will post problems on the appropriate mondo forum.

Again thanks

Re: DR build for LINUX

Dek_1 — Wed, 20 May 2009 07:50:43 GMT

Still not got it working but will close this and try some of the ideas suggested

Thanks