Hello all,
One of the dreaded Maxtor SATA drives in my RAID5 failed, after just 3 months of light use. Anyhow I neither have the disk capacity nor the money to buy it to make a backup. To make sure I do it correctly, could you folks please double-check my intended course of action? I would really appreciate that.
Current state:
xanadu:~# uname -a
Linux xanadu 2.6.8-1-386 #1 Mon Sep 13 23:29:55 EDT 2004 i686 GNU/Linux
xanadu:~# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.01
Creation Time : Fri Oct 8 13:01:49 2004
Raid Level : raid5
Array Size : 490223104 (467.51 GiB 501.99 GB)
Device Size : 245111552 (233.76 GiB 250.99 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent Update Time : Sun Jan 16 06:25:31 2005
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 1
Spare Devices : 0 Layout : left-symmetric
Chunk Size : 256K UUID : 0c758197:f3af8f3b:d68050c0:04ea429e
Events : 0.221727 Number Major Minor RaidDevice State
0 0 0 - removed
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc13 8 1 - faulty /dev/sda1
Here is what I think I should be doing:
- Remove failed disk from array:
mdadm /dev/md0 --remove /dev/sda1
- Physically remove disk from system - Add new disk to system, partition - Add to array:
mdadm /dev/md0 --add /dev/sda1
Anything else to trigger rebuilding of the disk?
That should be it, correct? Also since I lost all confidence in the Maxtor drives (had a long history of problems with that brand, I don't think any Maxtor drive I ever owned made it to retirement) I probably will buy a new drive immediately and replace the broken one. Then when the broken one is repaired/exchanged, I would like to add it as spare. To do so, would the sequence be
mdadm /dev/md0 --add /dev/sdd1
Is that it?
Also one last question: Foolishly I allocated all available space in the Maxtors for the RAID. Now, should the replacement drive have a slightly smaller capacity, is there some way to deal with that? I think i can use resize2fs to reduce the size of the filesystem (does this work with ext3 file systems?). Assuming that works, is there some way to convince the RAID to accept a smaller partition and adjust it's size accordingly?
Thanks all
Gerd
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