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Replacing/expanding internal RAID and mirror drives

1116 Views 4 Replies Latest reply: Nov 30, 2008 2:59 PM by The hatter RSS
JPSabo Calculating status...
Currently Being Moderated
Nov 30, 2008 8:24 AM
My present drive configuration (using OS X soft-RAID) is:

A stripe-set using 2 x 250 Gb mirrored to a 500 Gb drive:

Drive Bay.........1..................2......................3...................4
...................System..........250Gb.............250Gb...........500Gb
...........................................|--stripe set--|
.........................................................|-----mirror-----|

As I'm running out of space, I'd like to increase storage. I'm thinking of using a 1 Tb drive mirrored to a 1 Tb drive. How would I go about this upgrade (note that all drive bays are used)? Also, Time Capsule is now used to backup the entire system to an external 750 Gb drive (note that this RAID-mirror configuration was setup before Time Capsule was released).

Could I simply remove the 2 x 250 Gb drives, install a 1 Tb, set-up a mirror from the 500 Gb and let the system copy the contents from the 500 Gb to the 1 Tb? Then remove the 500 Gb drive, install the second 1 Tb and mirror that to the first 1 Tb drive and let the system copy the contents again.

Thanks in advance for the help.
MacPro, Mac OS X (10.5.5), Soft RAID and mirror
  • The hatter Level 9 Level 9 (58,590 points)
    Currently Being Moderated
    Nov 30, 2008 8:34 AM (in response to JPSabo)
    Invest in some external drive cases. Dual SATA drive case(s) are great $67, or ones with hot-swap ability.

    Apple software RAID, or "SoftRAID" the program/company?

    I would not do the mirror the way you are, I'd backup, or do 3 drive SoftRAID mirror.

    You could buy 3 WD 640GB for $220, or a couple 1TB Black Caviar for $260-70.

    What are you trying to achieve is most important? speed, redundancy, fear of drive failure? do you keep a bootable clone/backup of your system drive, one you can run Disk Warrior and DU from?

    Mirrors are created first, then restore the data to, and are not a replacement for backing up.
    Mac Pro, Mac OS X (10.5.5), Vista-64 9800GTX ACD 23" Caviar Blk Sonnet Tempo E4P APC RS1500
  • mbean Level 4 Level 4 (1,250 points)
    Currently Being Moderated
    Nov 30, 2008 2:13 PM (in response to JPSabo)
    Could I simply remove the 2 x 250 Gb drives, install a 1 Tb, set-up a mirror from the 500 Gb and let the system copy the contents from the 500 Gb to the 1 Tb? Then remove the 500 Gb drive, install the second 1 Tb and mirror that to the first 1 Tb drive and let the system copy the contents again.


    Dear JPSabo,
    What you are doing is fine. Simply use SoftRAID to break the mirror with the 500GB HD. Next, if your goal is RAID 1 redundancy insert the two 1TB hard disks and mirror them. Now copy the data from the 500GB to the 1TB dual drive mirror.

    I prefer an off line backup to a mirror as it is more secure. I would use SuperDuper to backup my data and remove the backup disk rather than using a mirror. A mirror is good if a hardware failure occurs. However, it does not help if the directory becomes corrupted. In that case the damaged directory is copied to both disks making them both unusable. This may be a good time to decide if you want an off-line backup, a mirror or both.

    If you ever find that your disk needs require more hard drive bays, I would recommend the FirmTek SeriTek/2SEN2-E bundle which includes one SeriTek/2EN2 external dual-bay hot-swap SATA enclosure and one SeriTek/2SE2-E PCI Express (PCIe) adapter for Mac Pro. This provides up to two additional bays and hot swap capability to easily load in backup disks without turning off the Mac Pro.

    http://firmtek.stores.yahoo.net/2ense2e.html

    Have fun!
    Mac Pro 2.8, Mac OS X (10.5.5)
  • The hatter Level 9 Level 9 (58,590 points)
    Currently Being Moderated
    Nov 30, 2008 2:59 PM (in response to JPSabo)
    Then I would strongly recommend you take a look at a couple guides that have been written and put together to custom configure Mac Pro for your type of work.

    I like to settle on a given drive and then I can mix and match and build data arrays, use for scratch or boot drives. Which today would be half a dozen 640GB WD drives, at one time would have been 10K Raptor (or the current VelociRaptor 150GB).

    http://kb.adobe.com/selfservice/viewContent.do?externalId=kb401089&sliceId=1

    CPU crunch: http://www.barefeats.com/harper.html

    This one is new, has a lot of indepth areas on memory, storage and more:
    http://macperformanceguide.com/OptimizingPhotoshop-Configuration.html

    http://homepage.mac.com/boots911/.Public/PhotoshopAccelerationBasics2.4W.pdf

    Building a photo database:
    http://www.macgurus.com/productpages/guides/PhotoStorage.php

    http://www.macgurus.com/
    Mac Pro, Mac OS X (10.5.5), Vista-64 9800GTX ACD 23" Caviar Blk Sonnet Tempo E4P APC RS1500

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