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    SubjectRe: non-fakeraid controllers
    Phillip Susi wrote:
    > Wakko Warner wrote:
    > >I've been wondering about dmraid. I considered buying an adaptec sata raid
    > >(hardware). One of the drawbacks on hardware raid is the format isn't
    > >compatible with any other card (or rather manufacturer). So the question
    > >is, has anyone written anything that can detect and activate disks from a
    > >hardware raid controller when they are placed on a controller w/o any raid?
    > >
    > >basically what I mean is, 3 disks, raid5 was in a system with hardware
    > >raid. the raid card blows up and cannot get another one so to get the data
    > >back,
    > >place disks in another machine or on a standard controller and use software
    > >raid or whatever to recover the data.
    >
    > Yes, that is one of the problems with hardware raid controllers. If you
    > can figure out the controller's metadata format, possibly by asking
    > adaptec, or reverse engineering, then patching dmraid to understand that
    > format ( it already understands several used by fakeraid controllers )
    > should be rather easy.

    One of the things that I noticed with adaptec's and ami's raid (and an old mylex
    dac960 IIRC) is that you can create containers or partitions (which every
    they call them) on a disk set. I guess you can take 3 disks, create a raid5
    using half the capcity of the 3 disks and a raid0 on the rest. I'm not sure
    about fakeraid controllers as I've never configured one.

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