Date: Wed, 26 Jan 2011 22:57:24 +0100 From: "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de> To: Christer Solskogen <christer.solskogen@gmail.com> Cc: Dan Nelson <dnelson@allantgroup.com>, freebsd-questions@freebsd.org Subject: Re: FreeBSD 9/ZFS: Striped Pool (2 disks) migrating to mirror (onto additional disk) Message-ID: <4D4098C4.6000105@mail.zedat.fu-berlin.de> In-Reply-To: <AANLkTimJwT6pShtC2c-O2=a=78LBB8%2Bm=WoFQXTkOqk9@mail.gmail.com> References: <4D3FDE82.4000105@mail.zedat.fu-berlin.de> <AANLkTi=udjU-MKEU%2BAHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com> <20110126195800.GM75125@dan.emsphone.com> <AANLkTimgbVvsFjc-FSdSoKe3cC6uNYNavvL1-WaCRSn4@mail.gmail.com> <20110126204233.GN75125@dan.emsphone.com> <AANLkTimJwT6pShtC2c-O2=a=78LBB8%2Bm=WoFQXTkOqk9@mail.gmail.com>
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On 01/26/11 21:47, Christer Solskogen wrote: > On Wed, Jan 26, 2011 at 9:42 PM, Dan Nelson<dnelson@allantgroup.com> wrote: > >> ZFS lets you add and detach mirrors on the fly, since you're not changing >> the capacity of the pool itself. Sure, you're going to lose the contents of >> the large 2TB drive, but that's sort of assumed. You can't convert 4TB of >> non-mirrored disks into 2TB of mirrored disks without losing 2TB of space. >> Just make sure you have less than 2TB total used data on all volumes, and >> copy the data off the 2TB filessytem onto the striped 1+1TB one before >> repartitioning and adding the mirrors. >> >> zpool attach [-f] pool device new_device >> > > The problem is that you cant attach a drive to a vdev that consists of > two striped disks. > All right, I see there is no way without any kind of trade-off. My thinking was simple, I thought since the two physical 1TB disks build one joint pool of 2TB overall capacity, I could simply 'mirror' this pool to another disk of the same capacity. Is there a way to 'send' via ZFS the data of the pool to the backup disk, like a snapshot from one pool to another one? Oliver
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