Intel RAID - Which are pairs

Posted on 2009-12-29
Last Modified: 2013-11-14
Trying to get data back from a failed RAID 10 set at present.
Anyone know which drives pair together in a RAID 10 array
on a ICH9R controller?
0&2, 0&3, 1&2, 1&3 all seem like strip sets.
0&1 and 2&3 don't seem to be a stripe set.
Drive 0 was the failed drive so that leaves only 1&2 or 1&3 as the vaild working pair at failure.


Question by:PhilPorritt
    LVL 46

    Assisted Solution

    The controller pairs according to what the user selected.   There is no default (and even if there was, there is no way to assume all motherboard makers will map the physical disks the same way.

    To solve the problem ... get yourself a binary editor and look at the first few blocks on each of the raw disks.
    LVL 7

    Accepted Solution

    I suggest, for the moment, to ignore your doubt,
    leave HDs as is, and backup,
    from OS, if locical volume does not conatin system partition, or,
    booting from a CD, if LV contains sys partition(s),
    all in an image file, then, think to restore.

    If you have spare disk, swap it with failed HD, and wait for automatic rebuilding .
    If you have not spare, scratch your RAID10, make a RAID1, hold 3rd disk as spare,
    and restore image file on new created Raid1 LV.

    A trivial observation:
    suppose your strip couple is 2&3 (Raid0), while HD 0 and 1 are the mirrors (contain the same data of 2&3):
    you cannot use HD 1  to backup 2&3, becouse you need a capacity double than the single HD.

    good year

    Author Closing Comment

    Issue resolved with Trial & error

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