Date: Wed, 26 Jan 2011 12:17:47 +0000 From: krad <kraduk@gmail.com> To: Christer Solskogen <christer.solskogen@gmail.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: <AANLkTikUcJxe2n9na_Ptz5v5wyUrGjwE9NKEJ52O_Rce@mail.gmail.com> In-Reply-To: <AANLkTi=udjU-MKEU%2BAHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com> References: <4D3FDE82.4000105@mail.zedat.fu-berlin.de> <AANLkTi=udjU-MKEU%2BAHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com>
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On 26 January 2011 09:21, Christer Solskogen <christer.solskogen@gmail.com> wrote: > On Wed, Jan 26, 2011 at 9:42 AM, O. Hartmann > <ohartman@mail.zedat.fu-berlin.de> wrote: > >> My question is: is it possible to migrate the two-disk pool without data >> 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 > way of doing what you want by creating a gmirror (or by hardware raid) > of the two 1TB disks. > > -- > chs, > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o= rg" > ive not tried it but wouldn't you want to gstripe the two disks together and then add the geom device to the pool? It sounds a bit horrible to me and with the price of 2TB disks being ~ =A365-70 here in the uk I wouldn't bother. Remember you will get a speed boost for reads on a mirror. WIth regards to the backup, the most efficient way would probably to use zfs send and receive between the pools
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