Hi,
I am running 3.2.0 (ubuntu 12.04). My raid5 has 3 disks (sd[cbd]1) and no
spares. The system boots off a non-raid device and auto discovers and
mounts the raid device.
For some reason, sdc1 is not automatically detected and is always missed
on each boot. I have to re-add it back. What could be causing this?
This did not happen while I was running 2.6.38.
Thanks,
Dong Lin
; mdadm --misc --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Fri Jul 22 22:39:40 2011
Raid Level : raid5
Array Size : 3907020800 (3726.03 GiB 4000.79 GB)
Used Dev Size : 1953510400 (1863.01 GiB 2000.39 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Mon May 7 09:21:29 2012
State : active
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : disc:0
UUID : 4195aaa7:0ebd37ce:d4b9481e:1a68f4a8
Events : 230784
Number Major Minor RaidDevice State
4 8 33 0 active sync /dev/sdc1
2 8 49 1 active sync /dev/sdd1
3 8 17 2 active sync /dev/sdb1
----------------------------
here is what happened on boot:
; dmesg |grep md
[ 1.781917] md: linear personality registered for level -1
[ 1.789184] md: multipath personality registered for level -4
[ 1.797121] md: raid0 personality registered for level 0
[ 1.801681] md: raid1 personality registered for level 1
[ 1.820485] ata7: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xfa00
irq 14
[ 1.820547] ata8: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xfa08
irq 15
[ 1.920271] md: bind<sdb1>
[ 1.962482] md: bind<sdd1>
[ 2.300917] md: raid6 personality registered for level 6
[ 2.300980] md: raid5 personality registered for level 5
[ 2.301036] md: raid4 personality registered for level 4
[ 2.306171] md: raid10 personality registered for level 10
[ 2.329393] md/raid:md0: device sdd1 operational as raid disk 1
[ 2.329450] md/raid:md0: device sdb1 operational as raid disk 2
[ 2.329792] md/raid:md0: allocated 3228kB
[ 2.329921] md/raid:md0: raid level 5 active with 2 out of 3 devices,
algorithm 2
[ 2.330235] created bitmap (15 pages) for device md0
[ 2.330706] md0: bitmap initialized from disk: read 1/1 pages, set 0 of
29809 bits
[ 2.362404] md0: detected capacity change from 0 to 4000789299200
[ 2.367990] md0: unknown partition table
=======================================
partition tables:
; fdisk -l | egrep '^/dev/sd[cbd]'
/dev/sdb1 63 3907024064 1953512001 fd Linux raid autodetect
/dev/sdc1 63 3907024064 1953512001 fd Linux raid autodetect
/dev/sdd1 63 3907024064 1953512001 fd Linux raid autodetect
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