4 Replies Latest reply: May 2, 2011 2:29 PM by Tod Kuykendall
senseamp Level 1 Level 1 (0 points)

.... which I would plan to use for work in a stand alone mode. It only has one 80Gb drive, and two blank slots. What are the possabilities for creating a raid array with three drives? I'm more concerned about data security. I have Leopard server OS. As ever, budget is tight

  • 1. Re: I just bought a 2006 Intel Xserve (2x2GHz dual core)...
    Tod Kuykendall Level 4 Level 4 (2,270 points)

    What kind of RAID did you want to create? Creating a RAID0 across all three drives will hurt rather than help your data security and while a RAID1 across two drives makes some sense I think RAID1 across three drives is a little silly. I usually RAID1 two of the drives and install the system on that partition and leave the third drive for data storage. That gives you separation of data and system but gives you a second system drive to boot from if the other system drive kicks out.

     

    To create a RAID5 across the three internal drives you'll need hardware like an internal RAID card as well as the drives and if your budget is tight it might be a stretch, but that's up to you.  If you run RAID5 without a hot spare you're fooling yourself if you don't have a "cold spare" on the shelf at all times. This will also only give you 2 drives worth of storage space (RAID5 is n-1 storage) which makes it more expensive per byte.

     

    As always RAID is not back-up - that is a separate issue. Different RAID schemes protect your data in different ways. Mirroring doesn't protect you from file deletion, failed updates etc. and RAID5 will protect you against the lose of a _single drive_ but not more. So it depends on what you want and you're willing to/can spend.

     

    My $.02,

    =Tod

  • 2. Re: I just bought a 2006 Intel Xserve (2x2GHz dual core)...
    senseamp Level 1 Level 1 (0 points)

    Thanks Tod,

     

    What you say makes sense. I guess I was wondering how people use three drive spaces effectively, since as you point out, you can't do a software RAID 5, "0" doesn't help security, and "1" just needs two drives. On my older G4 with four drives I created a RAID 0+1, which can be done with Tiger. So I'm leaning towards striping two (for speed), and then doing backup to a the third. I know back-up should really be seperate, but I think this is a practicle level I can live with.

  • 3. Re: I just bought a 2006 Intel Xserve (2x2GHz dual core)...
    DurocShark Level 1 Level 1 (10 points)

    I'm the opposite. I RAID 1 the DATA and let the OS live on the solo drive. It's a whole lot easier to drop the OS on than to replace lost data.


    And before anybody asks, yes, we use both time machine and regular backups. But I'd still rather replace the OS.

  • 4. Re: I just bought a 2006 Intel Xserve (2x2GHz dual core)...
    Tod Kuykendall Level 4 Level 4 (2,270 points)

    If you don't have data on the System drive that changes a lot - like a mailserver, databases or web activity - then the system is much easier to replace. Be sure you export your OD and your server settings regularly and you should be good to go.

     

    In my situation the "real data" lives on fibre DAS RAID so my internal third "data" disk really doesn't have anything crucial on it - the one or two most recent files I can about I could get from back-up if I wanted them.

     

    Everyone's set-up is different - except everyone needs back-up,

     

    =Tod