Dear Raiders
Another disk has gone down in my array :(, so I thought I'd give
"mdctl" a spin. First, some details:
My array, via "cat /etc/raidtab":
raiddev /dev/md0
raid-level 5
nr-raid-disks 3
nr-spare-disks 0
persistent-superblock 1
parity-algorithm left-symmetric
chunk-size 128
device /dev/sdb1
raid-disk 0
device /dev/sdc1
raid-disk 1
device /dev/sdd1
raid-disk 2
"cat /proc/mdstat" shows faulty disk "/dev/sdd1":
Personalities : [raid5]
read_ahead 1024 sectors
md0 : active raid5 sdd1[2](F) sdb[0] sdc1[1]
71119360 blocks level 5, 128k chunk, algorithm 2 [3/2] [UU_]
unused devices: <none>
And "mdctl --detail md0" gives:
/dev/md0:
Version : 00.90.00
Creation Time : Wed Apr 25 15:30:12 2001
Raid Level : raid5
Size : 35559680
Raid Disks : 3
Total Disks : 3
Preferred Minor : 0
Persistance : Superblock is persistant
Update Time : Tue Dec 18 16:40:36 2001
State : dirty, no-errors
Active Drives : 2
Working Drives : 2
Failed Drives : 1
Spare Drives : 0
Layout : left_symmetric
Chunk Size : 128K
Number Major Minor RaidDisk State
0 8 16 0 active sync /dev/sdb
1 8 33 1 active sync /dev/sdc1
2 8 49 2 faulty /dev/sdd1
UUID : 4b6a90b4:e3ad2a8c:77ee1019:7ca1a900
## Q.1: Why does the first device get listed as "sdb" and not "sdb1" ?
Note that "mdctl -E /dev/sdb1" doesn't work, it requires "/dev/sdb"
unlike the c and d drives...did I mess up?
From /proc/scsi/scsi:
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: SEAGATE Model: ST336704LC Rev: 0004
Type: Direct-Access ANSI SCSI revision: 03
Host: scsi2 Channel: 00 Id: 01 Lun: 00
Vendor: SEAGATE Model: ST336704LC Rev: 0004
Type: Direct-Access ANSI SCSI revision: 03
Host: scsi2 Channel: 00 Id: 02 Lun: 00
Vendor: IBM Model: DDYS-T36950M Rev: S93E
Type: Direct-Access ANSI SCSI revision: 03
## Q.2: The failed device /dev/sdd1 corresponds to the IBM disk, yes?
(If so, this is the third Deskstar drive to fail in the array, the
2 SEAGATEs are replacement drives!)
## Q.3: Can someone verify that to replace the drive I do:
mdctl --remove /dev/md0 /dev/sdd1
< hot swap failed drive with new one>
mdctl --add /dev/md0 /dev/sdd1
mdctl --assemble /dev/md0 /dev/sdb /dev/sdc1 /dev/sdd1
(note - use sdb, not sdb1?)
Many thanks!
Ian
--
Ian Thurlbeck http://www.stams.strath.ac.uk/
Statistics and Modelling Science, University of Strathclyde
Livingstone Tower, 26 Richmond Street, Glasgow, UK, G1 1XH
Tel: +44 (0)141 548 3667 Fax: +44 (0)141 552 2079
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