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I have two disks from an old server that I believe were a mirrored set. I placed them in a new server and tried to do a zpool import but nothing was found. Does that mean the data that was on them previously is lost or is there some way to reconstitute the pool?

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I think these disks may have been have been offlined and replaced with larger ones. Can I still use them to assemble a zpool? –  Jeff Sacksteder Jul 7 '13 at 2:42
    
Were the old server and new one using the same CPU architecture ? What old and new Solaris releases ? Was hardware or ZFS mirroring used ? –  jlliagre Jul 7 '13 at 13:22

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May be your old mirror set was a hardware one, not the ZFS. Depends on your HW. Check partitions table with prtvtoc /dev/rdsk/c#t#d# if something is there. ZFS can reconstruct its pools no matter what order are disks placed in.

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