Rebuilding RAID 1 Array in Linux with a new hard disk after a disk fault - Howto with screen shots
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From: Steven on 16 Jun 2010 11:10 On Wed, June 16, 2010 15:47, Michal wrote: > > One way is to label the disks themselves so you simply do; > > cat /proc/mdstat which might say /dev/sd3 is down. Open the case, look > for the disk labled /dev/sde and replace it. If you have LED's like > servers have (probably not) they can be a fiddle to get working but it's > possible > No LED's for drives, it already has them for every pci slot, looks like a Christmas tree :) I think you meant /dev/sde instead of sd3, right? If not, please correct me. If I'm not mistaken, mdadm will report the broken drive, then I have to look for the drive that corresponds to the 4th sata slot on the motherboard. That's part of my issue, can I be sure that the drive connected to port 4 is /dev/sde? It's not a problem for the other 2 drives, as they differ in capacity, but these 4 are exactly the same size. Also how accurate is mdadm in identifying the failed drive? As there are only 2 in an array, there is only 1 copy of the data to compare to. It also seems my last message was sent twice, sorry about that. -- Rarely do people communicate; they just take turns talking. -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/23813.91.183.48.98.1276699820.squirrel(a)stevenleeuw.kwik.to
From: Michal on 16 Jun 2010 11:40
On 16/06/2010 15:50, Steven wrote: > > On Wed, June 16, 2010 15:47, Michal wrote: >> >> One way is to label the disks themselves so you simply do; >> >> cat /proc/mdstat which might say /dev/sd3 is down. Open the case, look >> for the disk labled /dev/sde and replace it. If you have LED's like >> servers have (probably not) they can be a fiddle to get working but it's >> possible >> > No LED's for drives, it already has them for every pci slot, > looks like a Christmas tree :) > > I think you meant /dev/sde instead of sd3, right? If not, please correct me. > If I'm not mistaken, mdadm will report the broken drive, > then I have to look for the drive that corresponds to the 4th sata slot on > the motherboard. > That's part of my issue, can I be sure that the drive connected to port 4 > is /dev/sde? > It's not a problem for the other 2 drives, as they differ in capacity, > but these 4 are exactly the same size. > > Also how accurate is mdadm in identifying the failed drive? > As there are only 2 in an array, there is only 1 copy of the data to > compare to. > > It also seems my last message was sent twice, sorry about that. > Sorry I really didnt explain my self propely; Yes I mean /dev/sde and by lable I mean get a lable machine (or somehting similar) to put a physical lable on the drive, like a sticker with text saying /dev/sde I did this in one machine and simply built my RAID1 array across two drives, disconnected a drive, booted back up check mdstat to see which one was now disconnected and labled that one, then labled the second one. It's not a brilliant way I will admit but it works perfectly well. I tested it 3 times (connecting the drive back, rebuild array, disconnecting the other drive etc) to really make sure I had labled them correctly. -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/4C18EE14.6060604(a)ionic.co.uk |