From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phil Turmel Subject: Re: Looking for the best way to do this Date: Thu, 23 Jun 2011 19:41:13 -0400 Message-ID: <4E03CF19.1040702@turmel.org> References: <4E00DF31.2020406@gmail.com> <4E03929A.8000503@cdf.toronto.edu> <4E03B8DB.7010607@gmail.com> <4E03C444.6060406@turmel.org> <4E03CBC3.1080001@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4E03CBC3.1080001@gmail.com> Sender: linux-raid-owner@vger.kernel.org To: maurice Cc: "linux-raid@vger.kernel.org" List-Id: linux-raid.ids Hi Maurice, [restored CC list.... use reply-to-all on kernel.org lists] On 06/23/2011 07:26 PM, maurice wrote: > On 6/23/2011 4:55 PM, Phil Turmel wrote: >> Hi maurice, > > Hi Phil > > That was great, thank you! > > I gather that the R10 results ion a faster disk IO, in general? > Probably with the "far" version, if we are mostly reading? For most applications, yes. I haven't benchmarked it myself, though. > I would be willing to lose redundancy for the duration of the creation process. > Both disks presently seem to be OK. You'll also be offline while copying and switching to the new filesystem. Did you want layout=f2 or =f3 ? > Any chance you could "wrap up" for me with the correct syntax for this? > I find that the "trial and error " approach is less than optimal. First, run a check on your array, to minimize the chance of a read error during the copy: echo "check" >/sys/block/md*/md/sync_action While that's running, send me the output of "lsdrv", which will let me give advice with real device names: wget -O /usr/sbin/lsdrv http://github.com/pturmel/lsdrv/raw/master/lsdrv ; chmod 755 /usr/sbin/lsdrv ; lsdrv Phil