From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: Failed Array Rebuild advice Please Date: Wed, 11 Apr 2012 14:43:02 +1000 Message-ID: <20120411144302.35f13f3d@notabene.brown> References: <1334097164.41181.YahooMailNeo@web125506.mail.ne1.yahoo.com> <20120411090219.78392784@notabene.brown> <1334117647.68845.YahooMailNeo@web125505.mail.ne1.yahoo.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/wgS42eNisE7U+HoV14BFgl6"; protocol="application/pgp-signature" Return-path: In-Reply-To: <1334117647.68845.YahooMailNeo@web125505.mail.ne1.yahoo.com> Sender: linux-raid-owner@vger.kernel.org To: jahammonds prost Cc: Linux RAID List-Id: linux-raid.ids --Sig_/wgS42eNisE7U+HoV14BFgl6 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable On Tue, 10 Apr 2012 21:14:07 -0700 (PDT) jahammonds prost wrote: > One other question as the badblocks progresses. > =A0 > >=A0 It will then recovery both devices in parallel. >=20 > How many additional devices can be done at the same time? I presume that = I am going to have to=A0replace the 2 failed devices before I try and grow = the array by adding 3 additional drives? I so, how many=A0additional drives= can be rebuilt concurrently with a grow? Could I add 5 devices and not see= too much of a performance hit? Or would it be more sensible to add them on= e at a time? >=20 I think it is best to recover, and then reshape later. I cannot promise th= at doing them both at once will work .... it might but I have a feeling that there might be problems. Adding three additional drives at once should work well enough in terms of performance. However I would only do it if I were very very confident of the drives. If you hit bad blocks you start losing drives, and if you have 3 drives that you haven't used before, the chance of losing them all during the reshape - while still small - becomes a little too high for comfort. But if you have run heavy bad-blocks tests on them all and they appear to work, then adding 3 drives at once should be fine. NeilBrown --Sig_/wgS42eNisE7U+HoV14BFgl6 Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBT4UL1jnsnt1WYoG5AQIecxAAsfag+VeyagH7ss3d4ACcOyy1/QuVwyTw TNh4rLuV2UhwP83VinBxhKeKBgahiGX8q6EBeHVElFy/whRFKATxtPKZZnhD8i5V NWOrMLkoYVKyan/9q3RVg5AFYtVRHNHnPzcduoOZDwPXfU3+NwzBGVF7hCeyZVqM vMoYKcx393IVHhWq0mDN+BNniwX0kD1uREiUYTBBJXyL7Qvnxxqkk7GSnXqVgmNQ qyYzu6I2J8jUWjxPQh/xtbUxyg4BlbPXuhyYAiyQN23FYdNXHVIW96NnkZ3Ph+hX yad2pH3aNbcM6zQLQIlRR0jCb+Y7xOUUyBYngsPCMheOOxhjKKWfpyMlpGQbs+8C QYbcZo1BcuiyVmeqRUf6HmnsXdrBL377o5ttK3ZFVMMsJiVjj7uRk2lIwVvclzZE tGGETTPzu8n6T83QClFs66CzF/Eyi8olukEOz8lh4a/THqVO9XCcN5HcO+dIueMa Xwowd4wCRhhxbFQ8B5YZHfmtRXXGIGN89NJ+bU7RV3MdYVJtgY+Yxtcy3/akBvGZ rCVUdS8Qu29q89bqAw3CCQ0FBJmUI0LieoL9y1O6Lp/waWBf8M6ail7uClyTIsUO V1us0tT2kpeIF6hh5BV5+6EZtJRs2oTT534KWnN5gVdnSu5V57pRzaS2yu/W6TTq i/mbLLBIOGY= =lm/W -----END PGP SIGNATURE----- --Sig_/wgS42eNisE7U+HoV14BFgl6--