Date: Wed, 26 Jan 2011 21:12:57 +0100 From: Christer Solskogen <christer.solskogen@gmail.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>, freebsd-questions@freebsd.org Subject: Re: FreeBSD 9/ZFS: Striped Pool (2 disks) migrating to mirror (onto additional disk) Message-ID: <AANLkTimgbVvsFjc-FSdSoKe3cC6uNYNavvL1-WaCRSn4@mail.gmail.com> In-Reply-To: <20110126195800.GM75125@dan.emsphone.com> References: <4D3FDE82.4000105@mail.zedat.fu-berlin.de> <AANLkTi=udjU-MKEU%2BAHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com> <20110126195800.GM75125@dan.emsphone.com>
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On Wed, Jan 26, 2011 at 8:58 PM, Dan Nelson <dnelson@allantgroup.com> wrote= : > In the last episode (Jan 26), Christer Solskogen said: >> On Wed, Jan 26, 2011 at 9:42 AM, O. Hartmann wrote: >> > My question is: is it possible to migrate the two-disk pool without da= ta >> > loss into a mirrored pool by adding the one 2TB-disk? >> >> No, you cant create a two-way mirror of three disks with ZFS. The only w= ay >> of doing what you want by creating a gmirror (or by hardware raid) of th= e >> two 1TB disks. > > You can, if you partition the 2tb disk into two smaller volumes, each the > same size as one of the 1tb disks, then add one of those as a mirror of e= ach > original disk. =A0You'll end up with two mirrored vdevs in the pool. > Performance probably won't be as good as a real mirror, though, since zfs > doesn't know that two of its physical disks share a spindle. > Rememer that he also asked to do this without data loss. As far as I know you cant remove devices from a vdev. If he is willing to accept data loss there are a lots of ways of doing it. --=20 chs,
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