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RAID1 disk as desaster recovery option?

 
Hape
Advisor

RAID1 disk as desaster recovery option?

Hello all,

has anyone experiences with "using RAID1 disk as desaster recovery" ?

that means:
1. pull out one disk of RAID1 array of a running system, store it in a safe place and use it as a backup for case of desaster.
2. put in new disk in the running system to have the RAID array rebuilt
3. have a relieving sleep

If you don't have experiences, do you think that's a good idea to have a fast possibility to rebuild a system on identical hardware?

thanks
5 REPLIES
KMullins
Frequent Advisor

Re: RAID1 disk as desaster recovery option?

Pretty sure thats not supported by Hp however i have seen customers using it regardless.

Would you not looking into Ghost for instance and just reimage the server?
KarloChacon
Honored Contributor

Re: RAID1 disk as desaster recovery option?

yeah that's a good idea it's helpful too when you have to deploy several servers and dont want to install each of them that decrease the time deployment servers using RAID 1

regards
Didn't your momma teach you to say thanks!
Hape
Advisor

Re: RAID1 disk as desaster recovery option?

KMullins, yes, I used to use ghost for imaging servers, but it is much more complicated than the disk-option. think of bootable cd, service interruption, time to restore, etc., at least if you need to create an image periodically.
the disk-exchange is very fast and (at least from my point of view) very reliable.
you just need one disk and can exchange it for ex. every month with one of the running disks.
and what do you mean with "supported by hp"? is there any type of support for ghost? in the end, everyone is responsible by himself for the functionality of his desaster concept.
My intention is to hear pro's and con's about this solution and hopefully to hear that many others are are following this concept. :-) thanks again for any coment
KarloChacon
Honored Contributor

Re: RAID1 disk as desaster recovery option?

that it's not supported by HP it meens that
if you get issue doing this task and need to call HP for support they wont help you or they wont tell you this trick to deploy or backup(disaster recovery) like you're doing

regards
Didn't your momma teach you to say thanks!
Andrew_346
Regular Advisor

Re: RAID1 disk as desaster recovery option?

I'm 99% sure that any of the HP SA controllers will not allow you to import a failed array (1 disk of a mirror). You either would have to have both disks of the RAID1 or take the controller with the single disk.

There are much better ways to prepare yourself for a DR situation.

If making a copy of a production server is your only method for recovery, you might want to spend more time on this.

If you're looking for the least amount of downtime, your organization needs to plan for duplicate hardware that have mirrored configurations.

If you can afford a few hours of downtime to get a secondary system up and running, you should have a better sense of configuration management, copies of software and/or source code to reinstall applications, and offsite backups of the production data.

When your only plan is to run a single hard drive over to another site/system you run many risks:

1.) What happens if the source machines is burned to a crisp? You will have no source hard drive.
2.) What happens if your backup machine no longer accepts the same type of hard drive you are using in the source? Think SAS vs pSCSI... you'd be SOL.
3.) What happens when all of your hardware is toast and you have to get the only hardware available into production and it's from a different vendor? Think HP vs IBM, you would not be able to take a RAID array built on an HP controller and run it on an IBM controller...

To answer your original question: NO.

RAID technologies are designed to only provide redundancy on the specific system in question. Never rely on RAID to save your business in a disaster. It's always cool when you can transfer a RAID array to another system, but not during a crisis. You're asking to be put in a white coat with your arms behind your back...