From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Nigel J. Terry" Subject: Re: Raid5 reshape Date: Sat, 17 Jun 2006 18:01:46 -0400 Message-ID: <44947BCA.9040305@nigelterry.net> References: <449250ED.7090302@irule.net> <17554.21119.487820.638171@cse.unsw.edu.au> <4492D5B1.60004@nigelterry.net> <4492D8D9.7010101@irule.net> <17555.12441.42212.93049@cse.unsw.edu.au> <4493330E.30501@nigelterry.net> <17555.13409.834439.80361@cse.unsw.edu.au> <44945643.3070300@nigelterry.net> <17556.31295.280083.533342@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <17556.31295.280083.533342@cse.unsw.edu.au> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Neil Brown wrote: > On Saturday June 17, nigel@nigelterry.net wrote: > >> Any ideas what I should do next? Thanks >> >> > > Looks like you've probably hit a bug. I'll need a bit more info > though. > > First: > > >> [root@homepc ~]# cat /proc/mdstat >> Personalities : [raid5] [raid4] >> md0 : active raid5 sdb1[1] sda1[0] hdc1[4](S) hdb1[2] >> 490223104 blocks super 0.91 level 5, 128k chunk, algorithm 2 [4/3] >> [UUU_] >> [=>...................] reshape = 6.9% (17073280/245111552) >> finish=86.3min speed=44003K/sec >> >> unused devices: >> > > This really makes it look like the reshape is progressing. How > long after the reboot was this taken? How long after hdc1 has hot > added (roughly)? What does it show now? > > What happens if you remove hdc1 again? Does the reshape keep going? > > What I would expect to happen in this case is that the array reshapes > into a degraded array, then the missing disk is recovered onto hdc1. > > NeilBrown > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > I don't know how long the system was reshaping before the power went off, and then I had to restart when the power came back. It claimed it was going to take 430 minutes, so 6% would be about 25 minutes, which could make good sense, certainly it looked like it was working fine when I went out. Now nothing is happening, it shows: [root@homepc ~]# cat /proc/mdstat Personalities : [raid5] [raid4] md0 : active raid5 sdb1[1] sda1[0] hdc1[4](S) hdb1[2] 490223104 blocks super 0.91 level 5, 128k chunk, algorithm 2 [4/3] [UUU_] [=>...................] reshape = 6.9% (17073280/245111552) finish=2281.2min speed=1665K/sec unused devices: [root@homepc ~]# so the only thing changing is the time till finish. I'll try removing and adding /dev/hdc1 again. Will it make any difference if the device is mounted or not? Nigel