From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: Reshape RAID5 to a RAID6 with more (smaller) devices Date: Wed, 12 Jan 2011 18:54:35 +1100 Message-ID: <20110112185435.79c19036@notabene.brown> References: <20110112122930.6a17440f@natsu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/4+gmqsdPfRioOKbHctxfcOV"; protocol="application/pgp-signature" Return-path: In-Reply-To: <20110112122930.6a17440f@natsu> Sender: linux-raid-owner@vger.kernel.org To: Roman Mamedov Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/4+gmqsdPfRioOKbHctxfcOV Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Wed, 12 Jan 2011 12:29:30 +0500 Roman Mamedov wrote: > Hello! >=20 > I am considering to move my configuration in which I currently use two RA= ID5 > arrays (3*2TB and 3*1TB) to one described in [1]. Specifically, make a 6*= 1TB > RAID6 plus 3*1TB RAID5 consisting of 2TB drives' "tails". >=20 > My question is: does mdadm support a simultaneous reshape, changing at on= ce: > 1) RAID5 to RAID6 > 2) number of devices from 3 to 6 > 3) individual device size from 2TB to 1TB >=20 > Note that the user-accessible space after this reshape does not change, a= nd > remains at 4 TB. So is that supported? Will that require a backup file? W= ill > that proceed particularly inefficiently/slowly? >=20 > [1] http://www.linuxconfig.org/prouhd-raid-for-the-end-user >=20 Sorry, but no. It could be implemented, probably without a lot of difficulty, but it hasn't been. NeilBrown --Sig_/4+gmqsdPfRioOKbHctxfcOV Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.15 (GNU/Linux) iD8DBQFNLV5CG5fc6gV+Wb0RAr7kAJ44ksFpxDmyKlOy8Wt2e8lS/lzhmgCfUsPP FV3WZW/abgoxu2Dz3ILl2hk= =rNS4 -----END PGP SIGNATURE----- --Sig_/4+gmqsdPfRioOKbHctxfcOV--