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RAID 0+1 disk requirements

G

gigglebyte

2[H]4U
Joined
Jan 18, 2001
Messages
3,814
beginer question here so please don't kill me :D

I am thinking about getting into a RAID for my system (or more than likely a new system) and I have a few questions. I have done a bit of research but haven't been able to find the answer to this question.

If I setup a RAID 0+1 so I was striped and mirrored and I was using say (2) 120 Gig drives for the 0, how many would I need for the mirroring? does the mirror HAVE to be the same number of drives or just the same capacity?

Also if I decided I didn't want to go with a 0+1 setup and just did a 0, couldn't I just use a 3rd drive of the same capacity (or larger/smaller) to manualy backup/store important info so if the RAID gets hosed I don't loose all my stuff.

Any assistance on this is appreciated
 
What he said ^^

And about the RAID 0 plus a backup drive, that would fine as long as you have a spare IDE/SATA channel for the drive that's not part of the RAID array (obviously). Of course, the backup drive will be slower than the RAID 0 array or RAID 0 +1 since it's a single drive, but that goes without saying.
 
I knew somebody around here would know :D and as far as backing up being slower...that doesn't really matter to me as I would really just be using that drive as a place to keep a secondary copy of anything important
 
Is there any way for this 3rd Backup drive to automatically mirror the RAID 0 array?

I was considering the same setup: RAID 0 + backup drive.

What would be the easiest way for this backup drive to produce an actual mirror?

Or would it be easier to just create an image of the OS install on a partition, and then necessary files as needed on other partitions?

Thanks for any help.
 
if you want to use a large drive to backup your stripe (without mirroring) get a copy of ghost or something and just run that for your initial install and then a regular backup program to copy stuff over. You could schedule the backup so it did it automatically and incrementally (i.e. just the stuff that changed since your last backup), so you wouldn't have to worry about remembering to do it and it wouldn't take forever all the time. Just don't set it to backup your swapfile. ;) :D

This setup is pretty much the only choice if you can't/don't want to afford the full raid0+1 deal.

Other than that, you need 4 drives for stripe+mirror.

P.S. If you loose your stripe, I think the whole array goes, not just the partition. . .but I could be wrong about that.
 
well from what I understand the mirror is supposed to save you if a drive on the stripe fails...when you replace that drive I thought everything would be rebuilt from the mirror
 
Originally posted by xonik
RAID 0+1 requires at least four drives, period. 0+1 is a mirror of a stripe, so if you have one striped array, you'll need a mirror of that array. Even if you could use a single drive for the mirror, you would lose the RAID 0 speed advantage.
Click to expand...

it could be say 14 HDDs total,
its really limited only by the controller
and on a SCSI RAID controller, there are typically alot more options

regarding Backup
Ghost doesnt officially support RAID arrays, but does sometimes work
Ghost compatibility with RAID
Successfully imaging a RAID drive is dependent on the specific computer model, driver controller, hard drive, and RAID implementation. Symantec provides the following information only as an aid to cloning RAID drives.
Click to expand...
a statement that holds true to any resonably priced imaging software
(I do know of some $900 software that officially supports various RAID levels)

other alternatives would be SynchBack (Freeware)
or BackupMyPC formerly a Vertias Backup solution that was sold
http://www.stompinc.com/ (currently down)
those are copy backups not snapshot images
 
thanks again for all your help...now here is another question....what I am trying to do here is get a little more performance out of the system so I don't have to upgrade just yet (money is tight due to a remodel that is about to happen) and UT04 is just taking WAY to long to load the maps ;) so if I am going to spend some about $100 I can upgrade my RAM or get another WDSE 80gig and RAID this puppy so which do you think would provide me the best bang for the buck?

the way I am thinking is I can move the drives over to a new system with no problem but the PC2100 RAM I am using just won't cut it in a new system AND I can slip one of these by my wife but not both :eek:
 
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