From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?Kristleifur_Da=F0ason?= Subject: Re: Raid 5 to 6 reshape q Date: Sat, 2 Jan 2010 12:19:44 +0000 Message-ID: <73e903671001020419x47a07e69ucb5a01b99dc1fc03@mail.gmail.com> References: <625563.35920.qm@web51308.mail.re2.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <625563.35920.qm@web51308.mail.re2.yahoo.com> Sender: linux-raid-owner@vger.kernel.org To: Jon@ehardcastle.com Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Sat, Jan 2, 2010 at 8:52 AM, Jon Hardcastle wrote: > Hi guys, thanks for your help getting me going with this over the las= t week. I kicked it off last night and all is well. > ... > The only Q i have is it seems to be abit slow? > ... > md4 : active raid6 sdg1[4] sdf1[0] sde1[1] sdd1[2] sdc1[5] sdb1[3] sd= a1[6] > =A0 =A0 =A02441919680 blocks super 0.91 level 6, 64k chunk, algorithm= 18 [7/6] [UUUUUU_] > =A0 =A0 =A0[=3D=3D=3D>.................] =A0reshape =3D 17.9% (876008= 96/488383936) finish=3D2881.3min speed=3D2317K/sec That's very slow. An order of magnitude too slow in my view. I was initially seeing speeds like this during my recent reshape, but got it up to around 30MBps. I can't recall exactly what I did to get it running better - it was the equivalent of giving the television a good whack - but I seem to recall that increasing the md stripe cache size helped the most. I don't currently have access to my work computer where the command history lives, so this is all I have for now. If I find anything more to try, I'll chime in. -- Kristleifur -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html