From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Boag-Munroe Subject: Re: I am an idiot. Date: Thu, 4 Mar 2010 12:23:57 +0000 Message-ID: <68c4f7e31003040423x570bb7c8oef8b837009082e2c@mail.gmail.com> References: <68c4f7e31003040330s21b6059ex6859247ff67b43e2@mail.gmail.com> <4B8FA12E.9000606@anonymous.org.uk> <68c4f7e31003040422u60b75b89id2042a34643424fa@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <68c4f7e31003040422u60b75b89id2042a34643424fa@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: John Robinson Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 4 March 2010 12:22, Alex Boag-Munroe wrote: > On 4 March 2010 12:01, John Robinson = wrote: >> On 04/03/2010 11:30, Alex Boag-Munroe wrote: >>> >>> Hi guys... >>> >>> Yes I am an idiot. =A0I was changing the chunk size of my RAID5 arr= ay >>> last night from 64kb to 256kb and left it running overnight. =A0Dur= ing >>> the night we had a power outage. >>> >>> This is where the idiot part comes in. =A0The backup file is on a >>> filesystem that's part of the RAID5 array, so obviously I am unable= to >>> start it. =A0I completely forgot the filesystem I specified for >>> --backup-file was part of the same array. >>> >>> Once you're all done pointing and laughing, can you let me know if = I >>> am totally screwed? =A0I've a lot of data here that I -really- don'= t >>> want to lose... >>> >>> Please help.. >>> >>> Idiot. >>> >>> -- >>> Alex Boag-Munroe >>> >>> Lack of planning on your part does not constitute an emergency on m= ine. >> >> OK, I was done pointing and laughing, until I saw your signature. Di= d you >> choose that on purpose or did Gmail pick it for you? >> >> I'm afraid I can't help with your problem, except to say that I've a= feeling >> you ought to be able to manually restart the half-reshaped array wit= hout the >> backup file, so the worst case ought to be that you might lose one b= ackup >> file's worth of data. However, kernel and mdadm versions together wi= th >> output of `mdadm --detail` of your md device and `mdadm --examine` o= f its >> constituent devices will help those more knowledgeable than me tell = you what >> to do next. If you're lucky the boss, Neil Brown, will help but I im= agine >> he's asleep right now since he lives in Australia and it's the middl= e of the >> night there. >> >> Best of luck, >> >> John. >> > > Hi John, thanks so much for your reply. > > That is my signature and I stand by it, hence the whole "me idiot" an= d > not DEMANDING I get help etc. > > mdadm is version 3.1.1. =A0New developments. =A0I found a post on the > internet where Neil recommended to someone to recreate the array > without erasing it. =A0Which I have done, mdadm starts the array and > mdadm -D shows that almost a terabyte of space is in use. > > However, mdadm -D also shows a chunk size of 512k, which is neither > the 64k original chunk nor the 512k I asked for. > > Kernel version is gentoo-sources-2.6.33. > > Output of mdadm --examine for /dev/sda5 through /dev/sdd5: > > /dev/sda5: > =A0 =A0 =A0 =A0 =A0Magic : a92b4efc > =A0 =A0 =A0 =A0Version : 0.90.00 > =A0 =A0 =A0 =A0 =A0 UUID : 17862986:014cb4c0:ffe6e849:786ed339 (local= to host ncc-1701-e) > =A0Creation Time : Thu Mar =A04 13:10:24 2010 > =A0 =A0 Raid Level : raid5 > =A0Used Dev Size : 974767616 (929.61 GiB 998.16 GB) > =A0 =A0 Array Size : 2924302848 (2788.83 GiB 2994.49 GB) > =A0 Raid Devices : 4 > =A0Total Devices : 4 > Preferred Minor : 1 > > =A0 =A0Update Time : Thu Mar =A04 13:10:29 2010 > =A0 =A0 =A0 =A0 =A0State : clean > =A0Active Devices : 4 > Working Devices : 4 > =A0Failed Devices : 0 > =A0Spare Devices : 0 > =A0 =A0 =A0 Checksum : b951290 - correct > =A0 =A0 =A0 =A0 Events : 3 > > =A0 =A0 =A0 =A0 Layout : left-symmetric > =A0 =A0 Chunk Size : 512K > > =A0 =A0 =A0Number =A0 Major =A0 Minor =A0 RaidDevice State > this =A0 =A0 0 =A0 =A0 =A0 8 =A0 =A0 =A0 =A05 =A0 =A0 =A0 =A00 =A0 =A0= =A0active sync =A0 /dev/sda5 > > =A0 0 =A0 =A0 0 =A0 =A0 =A0 8 =A0 =A0 =A0 =A05 =A0 =A0 =A0 =A00 =A0 =A0= =A0active sync =A0 /dev/sda5 > =A0 1 =A0 =A0 1 =A0 =A0 =A0 8 =A0 =A0 =A0 21 =A0 =A0 =A0 =A01 =A0 =A0= =A0active sync =A0 /dev/sdb5 > =A0 2 =A0 =A0 2 =A0 =A0 =A0 8 =A0 =A0 =A0 37 =A0 =A0 =A0 =A02 =A0 =A0= =A0active sync =A0 /dev/sdc5 > =A0 3 =A0 =A0 3 =A0 =A0 =A0 8 =A0 =A0 =A0 53 =A0 =A0 =A0 =A03 =A0 =A0= =A0active sync =A0 /dev/sdd5 > /dev/sdb5: > =A0 =A0 =A0 =A0 =A0Magic : a92b4efc > =A0 =A0 =A0 =A0Version : 0.90.00 > =A0 =A0 =A0 =A0 =A0 UUID : 17862986:014cb4c0:ffe6e849:786ed339 (local= to host ncc-1701-e) > =A0Creation Time : Thu Mar =A04 13:10:24 2010 > =A0 =A0 Raid Level : raid5 > =A0Used Dev Size : 974767616 (929.61 GiB 998.16 GB) > =A0 =A0 Array Size : 2924302848 (2788.83 GiB 2994.49 GB) > =A0 Raid Devices : 4 > =A0Total Devices : 4 > Preferred Minor : 1 > > =A0 =A0Update Time : Thu Mar =A04 13:10:29 2010 > =A0 =A0 =A0 =A0 =A0State : clean > =A0Active Devices : 4 > Working Devices : 4 > =A0Failed Devices : 0 > =A0Spare Devices : 0 > =A0 =A0 =A0 Checksum : b9512a2 - correct > =A0 =A0 =A0 =A0 Events : 3 > > =A0 =A0 =A0 =A0 Layout : left-symmetric > =A0 =A0 Chunk Size : 512K > > =A0 =A0 =A0Number =A0 Major =A0 Minor =A0 RaidDevice State > this =A0 =A0 1 =A0 =A0 =A0 8 =A0 =A0 =A0 21 =A0 =A0 =A0 =A01 =A0 =A0 = =A0active sync =A0 /dev/sdb5 > > =A0 0 =A0 =A0 0 =A0 =A0 =A0 8 =A0 =A0 =A0 =A05 =A0 =A0 =A0 =A00 =A0 =A0= =A0active sync =A0 /dev/sda5 > =A0 1 =A0 =A0 1 =A0 =A0 =A0 8 =A0 =A0 =A0 21 =A0 =A0 =A0 =A01 =A0 =A0= =A0active sync =A0 /dev/sdb5 > =A0 2 =A0 =A0 2 =A0 =A0 =A0 8 =A0 =A0 =A0 37 =A0 =A0 =A0 =A02 =A0 =A0= =A0active sync =A0 /dev/sdc5 > =A0 3 =A0 =A0 3 =A0 =A0 =A0 8 =A0 =A0 =A0 53 =A0 =A0 =A0 =A03 =A0 =A0= =A0active sync =A0 /dev/sdd5 > /dev/sdc5: > =A0 =A0 =A0 =A0 =A0Magic : a92b4efc > =A0 =A0 =A0 =A0Version : 0.90.00 > =A0 =A0 =A0 =A0 =A0 UUID : 17862986:014cb4c0:ffe6e849:786ed339 (local= to host ncc-1701-e) > =A0Creation Time : Thu Mar =A04 13:10:24 2010 > =A0 =A0 Raid Level : raid5 > =A0Used Dev Size : 974767616 (929.61 GiB 998.16 GB) > =A0 =A0 Array Size : 2924302848 (2788.83 GiB 2994.49 GB) > =A0 Raid Devices : 4 > =A0Total Devices : 4 > Preferred Minor : 1 > > =A0 =A0Update Time : Thu Mar =A04 13:10:29 2010 > =A0 =A0 =A0 =A0 =A0State : clean > =A0Active Devices : 4 > Working Devices : 4 > =A0Failed Devices : 0 > =A0Spare Devices : 0 > =A0 =A0 =A0 Checksum : b9512b4 - correct > =A0 =A0 =A0 =A0 Events : 3 > > =A0 =A0 =A0 =A0 Layout : left-symmetric > =A0 =A0 Chunk Size : 512K > > =A0 =A0 =A0Number =A0 Major =A0 Minor =A0 RaidDevice State > this =A0 =A0 2 =A0 =A0 =A0 8 =A0 =A0 =A0 37 =A0 =A0 =A0 =A02 =A0 =A0 = =A0active sync =A0 /dev/sdc5 > > =A0 0 =A0 =A0 0 =A0 =A0 =A0 8 =A0 =A0 =A0 =A05 =A0 =A0 =A0 =A00 =A0 =A0= =A0active sync =A0 /dev/sda5 > =A0 1 =A0 =A0 1 =A0 =A0 =A0 8 =A0 =A0 =A0 21 =A0 =A0 =A0 =A01 =A0 =A0= =A0active sync =A0 /dev/sdb5 > =A0 2 =A0 =A0 2 =A0 =A0 =A0 8 =A0 =A0 =A0 37 =A0 =A0 =A0 =A02 =A0 =A0= =A0active sync =A0 /dev/sdc5 > =A0 3 =A0 =A0 3 =A0 =A0 =A0 8 =A0 =A0 =A0 53 =A0 =A0 =A0 =A03 =A0 =A0= =A0active sync =A0 /dev/sdd5 > /dev/sdd5: > =A0 =A0 =A0 =A0 =A0Magic : a92b4efc > =A0 =A0 =A0 =A0Version : 0.90.00 > =A0 =A0 =A0 =A0 =A0 UUID : 17862986:014cb4c0:ffe6e849:786ed339 (local= to host ncc-1701-e) > =A0Creation Time : Thu Mar =A04 13:10:24 2010 > =A0 =A0 Raid Level : raid5 > =A0Used Dev Size : 974767616 (929.61 GiB 998.16 GB) > =A0 =A0 Array Size : 2924302848 (2788.83 GiB 2994.49 GB) > =A0 Raid Devices : 4 > =A0Total Devices : 4 > Preferred Minor : 1 > > =A0 =A0Update Time : Thu Mar =A04 13:10:29 2010 > =A0 =A0 =A0 =A0 =A0State : clean > =A0Active Devices : 4 > Working Devices : 4 > =A0Failed Devices : 0 > =A0Spare Devices : 0 > =A0 =A0 =A0 Checksum : b9512c6 - correct > =A0 =A0 =A0 =A0 Events : 3 > > =A0 =A0 =A0 =A0 Layout : left-symmetric > =A0 =A0 Chunk Size : 512K > > =A0 =A0 =A0Number =A0 Major =A0 Minor =A0 RaidDevice State > this =A0 =A0 3 =A0 =A0 =A0 8 =A0 =A0 =A0 53 =A0 =A0 =A0 =A03 =A0 =A0 = =A0active sync =A0 /dev/sdd5 > > =A0 0 =A0 =A0 0 =A0 =A0 =A0 8 =A0 =A0 =A0 =A05 =A0 =A0 =A0 =A00 =A0 =A0= =A0active sync =A0 /dev/sda5 > =A0 1 =A0 =A0 1 =A0 =A0 =A0 8 =A0 =A0 =A0 21 =A0 =A0 =A0 =A01 =A0 =A0= =A0active sync =A0 /dev/sdb5 > =A0 2 =A0 =A0 2 =A0 =A0 =A0 8 =A0 =A0 =A0 37 =A0 =A0 =A0 =A02 =A0 =A0= =A0active sync =A0 /dev/sdc5 > =A0 3 =A0 =A0 3 =A0 =A0 =A0 8 =A0 =A0 =A0 53 =A0 =A0 =A0 =A03 =A0 =A0= =A0active sync =A0 /dev/sdd5 > > Booting with autodetecting raid, states that there's no valid 0.9 sup= erblock. > > -- > Alex Boag-Munroe > > Lack of planning on your part does not constitute an emergency on min= e. > Oops. Where I said "it isn't the 512k chunk I asked for" I meant 256k c= hunk. Thanks again --=20 Alex Boag-Munroe Lack of planning on your part does not constitute an emergency on mine. -- 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