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Guys Thanks for the prompt responses. Sorry I have only just got back to this. The powerfail was a result of moving house and my wife thinks that unpacking and putting up shelves is more important than my server... I have investigated some more. This array of 2 * 250GB disks was set up as RAID5 with the aim of adding another drive later. I have bought that drive today, but not yet installed it. In the 2 disk state it appears to give 250GB of storage. I can provide the following extra information: # cat /proc/mdstat Personalities : [raid5] unused devices: <none> # mdadm --query /dev/md0 /dev/md0: is an md device which is not active # mdadm --query /dev/md0 /dev/md0: is an md device which is not active /dev/md0: is too small to be an md component. # mdadm --query /dev/sda1 /dev/sda1: is not an md array /dev/sda1: device 0 in 2 device undetected raid5 md0. Use mdadm --examine for more detail. #mdadm --query /dev/sdb1 /dev/sdb1: is not an md array /dev/sdb1: device 1 in 2 device undetected raid5 md0. Use mdadm --examine for more detail. # mdadm --examine /dev/md0 mdadm: /dev/md0 is too small for md # mdadm --examine /dev/sda1 /dev/sda1: Magic : a92b4efc Version : 00.90.02 UUID : c57d50aa:1b3bcabd:ab04d342:6049b3f1 Creation Time : Thu Dec 15 15:29:36 2005 Raid Level : raid5 Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Update Time : Tue Mar 21 06:25:52 2006 State : active Active Devices : 1 Working Devices : 1 Failed Devices : 2 Spare Devices : 0 Checksum : 2ba99f09 - correct Events : 0.1498318 Layout : left-symmetric Chunk Size : 128K Number Major Minor RaidDevice State this 0 8 1 0 active sync /dev/sda1 0 0 8 1 0 active sync /dev/sda1 1 1 0 0 1 faulty removed #mdadm --examine /dev/sdb1 /dev/sdb1: Magic : a92b4efc Version : 00.90.02 UUID : c57d50aa:1b3bcabd:ab04d342:6049b3f1 Creation Time : Thu Dec 15 15:29:36 2005 Raid Level : raid5 Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Update Time : Tue Mar 21 06:23:57 2006 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : 2ba99e95 - correct Events : 0.1498307 Layout : left-symmetric Chunk Size : 128K Number Major Minor RaidDevice State this 1 8 17 1 active sync /dev/sdb1 0 0 8 1 0 active sync /dev/sda1 1 1 8 17 1 active sync /dev/sdb1 It looks to me like there is no hardware problem, but maybe I am wrong. I cannot find any file /etc/mdadm.conf nor /etc/raidtab. How would you suggest I proceed? Thanks Nigel Message: 4 Date: Wed, 29 Mar 2006 13:39:57 -0600 From: Ian Pilcher <i.pilcher@xxxxxxxxxxx> Subject: Re: Help needed - RAID recovery from Power-fail To: fedora-list@xxxxxxxxxx Message-ID: <e0enqd$8cg$1@xxxxxxxxxxxxx> Content-Type: text/plain; charset=ISO-8859-1 Nigel J. Terry wrote: I run FC4 (64bit). I have an array of two disks /dev/sda1 and /dev/sdb1 as a raid5 array /dev/md0 on top of which I run lvm and mount the whole lot as /home RAID-5 requires at least three disks. The only way that a RAID-5 array can run with two disks is in "degraded" mode -- as if the third disk had failed. How did you create this thing? md0 is not clean Cannot start dirty degraded array failed to run raid set md0 That's relatively self-explanatory. You're probably going to have to dig up a third disk somewhere and add it to the array before it will resync. fsck.ext3 No such file or directory while trying to open /dev/RaidGroup/RaidVolume If the RAID device can't be started, then nothing built on it "exists". Naturally I don't have a full backup, so somehow I need to recover if at all possible. Should be possible with a third disk. |
