# [OmniOS-discuss] rpool mirroring alignment problem

Natxo Asenjo natxo.asenjo at gmail.com
Wed Jun 11 17:43:18 UTC 2014

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    On Wed, Jun 11, 2014 at 7:32 PM, Dale Ghent <daleg at omniti.com> wrote:

    >
    > On Jun 11, 2014, at 1:01 PM, Natxo Asenjo <natxo.asenjo at gmail.com> wrote:
    >
    > > # zpool attach -f rpool c4t13d1s0 c4t14d1s0
    > > cannot attach c4t14d1s0 to c4t13d1s0: devices have different sector
    > alignment
    > >
    > > Any ideas? Yes, I am aware of the fact both disks are different in size,
    > but provided I am formatting the 2nd one and copying the disklabel from the
    > smaller one it should be ok, shouldn't it?
    >
    > So let’s look at the two drives you’re trying to work with:
    >
    > WD1600BJKT (c4t13d1, your boot disk)
    > WD2500BPVT (c4t14d1, the mirror you want to add)
    >
    > Looking up those drives (WD Scorpio Blue and Scorpio Black models,
    > respectively) shows that the WD2500BPVT has WD’s “Advanced Format” on it -
    > ie, sector size is larger than the traditional 512n which which what the
    > WD1600BJKT has. The Advanced Format is denoted in the drive model number
    > with the “PVT” suffix.
    >
    > Because of this, zfs will refuse to try to meld the drives together into a
    > mirror. You will need to replace the WD2500BPVT with a WD1600BJKT to match
    > your existing one, or at the least make sure the drive is formatted with
    > 512k sectors and not something larger.
    >

    ok, clear, but the question remains: how do I achieve that (so I do not
    have a  WD1600BJKT, and want to format it with 512k sectors) in omnios? Is
    it possible or do I just need to reinstall (I do have 2 WD2500BPVT disks,
    so that is possible; a pain, but possible).

    --
    groet,
    natxo
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