From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Haigh Subject: RAID6 - whole disk vs partitions Date: Sun, 20 Dec 2015 01:34:25 +1100 Message-ID: <56756AF1.7050005@crc.id.au> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="MQCbQwASFkFObX6dcagWFjiwbndl3DmqQ" Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --MQCbQwASFkFObX6dcagWFjiwbndl3DmqQ Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi all, I'm revisiting this topic after a few years - so excuse me if I'm a little behind the times on this questioning. I'm just starting to replace some 5 year old disks in a RAID6 (5 disks) due to one having started to throw uncorrectable / reallocated sectors. As such, it seems a good time to go to 3Tb drives - which are only $20 more than 2Tb drives. The array is created as follows: md2 : active raid6 sdf[0] sde[6] sdg[7] sdd[5] sdc[8] 5860150272 blocks super 1.2 level 6, 128k chunk, algorithm 2 [5/5] [UUUUU] I've always used the whole disk for the RAID6 - as from what I understand, this gives the best layout for various drives - no matter if they're 512 or 4096 byte sectors. Is this still the case? I've noticed that my resync speeds on this RAID6 hover around 60Mb/sec - which I was expecting to be a bit quicker (although I haven't tested speeds on this array for years). Currently using kernel 4.1.15 on an EL6 install. Would be grateful for any input people may have on these topics. --=20 Steven Haigh Email: netwiz@crc.id.au Web: https://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897 --MQCbQwASFkFObX6dcagWFjiwbndl3DmqQ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJWdWrzAAoJEEGvNdV6fTHczqoP/2syRO3xRQlnyzypUhsYOvLs 0IEPOtfsNJbXWu5fkJEjmvH2CB9pqUqfB1TboPFnaBG6DtQZDFad/OEdfDSudnl1 53xo8LQ3gOsCuvAViMnXiXXdWm3RTnw+UVq+grdxjXIjkFxfbMDJCf9X6Z+VzwcG umrw0/d1S4dkPZpCso6SVMTu0xskqlEaRoNpZfm9ZKIx2RiFJMl5fwsdcj9fDsQe sqhNpma0l2FAe3gKwc6BE9XUVcPxFamgOaTy/AiMi4CQxyXjFsbvF7EULad+711I CrvuaBlKkDNlGPMg4fFYrF1zPXzkb+rtwcrb/vCwGE/uQs9tovqa+HF9sOaZACSM yenjcWig6FqBIKAiJ0Nwn2ILI0tKZklLwpWvU0mKuhM7JfQyefDSnPw8ap1yIjaj uvI+OGTzoB/dcjzn6vOhP4y4NdRf0DQui3nN2Ndc0vcXoXRId83CuECF6+331Fx7 brX63lna0Aq3A5GjHnmNkMBkqAYeYTaFmtWcN/v53IHdLpLKdBsKzOp/vEj0E8Ki kfrbQVfWGlF02eu2Hl8JzaKfensqjW6pO3mVBI43WN/pWKqY7+bnhrymKZjcLXzf DihTZ4kNkdvcPri24LVtQOMA8dQgP0OyXwhKM/AaAnXMOlWHhenzneMrugjactor lGb7iNUvT/1LSWK6VIeP =pcFa -----END PGP SIGNATURE----- --MQCbQwASFkFObX6dcagWFjiwbndl3DmqQ--