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Operating System - Tru64 Unix
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System Clone

Steve Putnam
Occasional Contributor

System Clone

I have two systems just alike, one is our production system the other is supposed to be the backup for the production.

What is the best way to make the second system be a true backup of the prodcution. ( beside clustering them.) Lets say the production system is down, I would like to be able to boot the second system up as the production!
Any ideas??
6 REPLIES
Stiwi Wondrusch
Trusted Contributor

Re: System Clone

He Steve

It depends on your environment. Tell us.
e.g. do you have a SAN? ...

rgds Stiwi
Steve Putnam
Occasional Contributor

Re: System Clone

Yes this system is connected to a EMC CX500 storage array.
Mulgund
Frequent Advisor

Re: System Clone

Storage array can host the boot disk mapped to both the (primary and backup) systems.
But then you will have downtime if for some reason the OS corrupts.

Thinking simple, why not install same ver. of OS and apps. on both the systems and map the shared data disk.

-Srinivas.
Mark Poeschl_2
Honored Contributor

Re: System Clone

Or better yet install TruCluster on your systems and let the failover be completely automatic.
Stiwi Wondrusch
Trusted Contributor

Re: System Clone

We need more Info:
-Do you boot from the SAN?
-Any local disks involved?
-Do you use LVM?
-What failure do you want to cover?

The easiest:
-All Disks on the SAN (including boot disk).
-Server A breaks (HW failure but data ok)
-On the SAN: give Server B access to all Disks
-Boot Server B

rgds Stiwi
Ralf Puchner
Honored Contributor

Re: System Clone

You can not "clone" the OS because due to device handling of Tru64 devices will be renamed/renumbered leading to troubles with e.g. lsm, cluster etc.

So the only chance is to configure both servers independently or by using the real clone utility. Remapping data-disks in case of trouble to the survived machine.
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