From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Micha=C5=82?= Sawicz Subject: Re: Building RAID5 w/o a Hot Spare Date: Wed, 27 Jan 2010 16:34:50 +0100 Message-ID: <1264606490.1928.5.camel@test.apertos.eu> References: <1264603005.1928.3.camel@test.apertos.eu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-2y32oxjPP9pZ4Mzj7WiQ" Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Carlos Williams Cc: linux-raid List-Id: linux-raid.ids --=-2y32oxjPP9pZ4Mzj7WiQ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Dnia 2010-01-27, =C5=9Bro o godzinie 09:41 -0500, Carlos Williams pisze: > 2010/1/27 Micha=C5=82 Sawicz : > > I'm not sure I understand what you want to achieve. A 'spare' disk > is > > one that isn't used until any of the other fail, then the spare > replaces > > the failed one. The term 'hot spare' is used to identify a disk that > is > > a mirror of one of the other drives, but there's no support for that > in > > Linux Software-RAID. >=20 > I am sorry because I think I was using the wrong terminology then. I > want to use all 4 disks to be an active member or the RAID5 /dev/md0. > I wanted to make sure the command I posted in my original post was not > going to use 3 partitions for active members of RAID5 on /dev/md0 and > use the 4th drive as a 'spare device' in case one of the three drives > fail. I don't want that. I just want 4 active / working devices for > /dev/md0. >=20 > >> mdadm --create /dev/md0 --level=3D5 > --raid-devices=3D4 /dev/sda2 /dev/sdb2 > >> /dev/sdc2 /dev/sdd2 > > > > This will create a RAID5 array of 4 devices, yes. Capacity will be 3 > x > > sd?2. Failure of any one of those disks will not harm the data. >=20 > OK. I think that answers my questions. Thanks for your help! Great. Please keep the mailing list in the loop. --=20 Cheers Micha=C5=82 (Saviq) Sawicz --=-2y32oxjPP9pZ4Mzj7WiQ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: To jest =?UTF-8?Q?cz=C4=99=C5=9B=C4=87?= =?UTF-8?Q?_wiadomo=C5=9Bci?= podpisana cyfrowo -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (GNU/Linux) iEYEABECAAYFAktgXRoACgkQzQlUjpZYlbcRSQCgh0xnDorOIxtKUZw6+a9xWkq/ 85cAoKYuaYRufPYoPj3uoU0BmWD8Njx3 =o7Ks -----END PGP SIGNATURE----- --=-2y32oxjPP9pZ4Mzj7WiQ--