I have a RAID5 (5+1spare) setup that works perfectly well until I
reboot. I have 6 drives (two different models) partitioned to give me 2
arrays, md0 and md1, that I use for /home and /var respectively.
When I reboot, the system assembles each array, but swaps out what was
the spare with one of the member drives. It then immediately detects a
degraded array and rebuilds. After that, all is fine and testing has
shown things to be working like they should. Until I reboot.
Example:
Built two arrays: /dev/md0 -> /dev/sd[abcef]1 and /dev/md1 ->
/dev/sd[abcef]2
Added /dev/sdg1 and /dev/sdg2 as spares, and this works.
One scenario when I reboot:
md0 is assembled from sd[abceg]1; it's degraded and reports a
"spares missing" event.
md1 assembles correctly, spare is not missing
Any ideas? I have asked about this on various boards (some said UDEV
rules would help, some thought the issue had to do with the /dev/sdX
names changing, etc). I don't think those are applicable since dmesg
reports the arrays assemble as soon as the disks are detected.
Thanks in advance!
INFO:
(currently the boot drive (non raid) is sdd, otherwise all sd devices
are part of the raid)
fdisk:
$ sudo fdisk -l
Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sda1 1 1521 12217401 fd Linux raid
autodetect
/dev/sda2 1522 30401 231978600 fd Linux raid
autodetect
Disk /dev/sdb: 251.0 GB, 251000193024 bytes
255 heads, 63 sectors/track, 30515 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdb1 1 1521 12217401 fd Linux raid
autodetect
/dev/sdb2 1522 30401 231978600 fd Linux raid
autodetect
Disk /dev/sdc: 251.0 GB, 251000193024 bytes
255 heads, 63 sectors/track, 30515 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdc1 1 1521 12217401 fd Linux raid
autodetect
/dev/sdc2 1522 30401 231978600 fd Linux raid
autodetect
Disk /dev/md0: 50.0 GB, 50041978880 bytes
2 heads, 4 sectors/track, 12217280 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000
Disk /dev/md0 doesn't contain a valid partition table
Disk /dev/md1: 950.1 GB, 950183919616 bytes
2 heads, 4 sectors/track, 231978496 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000
Disk /dev/md1 doesn't contain a valid partition table
Disk /dev/sdd: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x535bfd7a
Device Boot Start End Blocks Id System
/dev/sdd1 * 1 14219 114214086 83 Linux
/dev/sdd2 14220 14593 3004155 5 Extended
/dev/sdd5 14220 14593 3004123+ 82 Linux swap /
Solaris
Disk /dev/sde: 251.0 GB, 251000193024 bytes
255 heads, 63 sectors/track, 30515 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sde1 1 1521 12217401 fd Linux raid
autodetect
/dev/sde2 1522 30401 231978600 fd Linux raid
autodetect
Disk /dev/sdf: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdf1 1 1521 12217401 fd Linux raid
autodetect
/dev/sdf2 1522 30401 231978600 fd Linux raid
autodetect
Disk /dev/sdg: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdg1 1 1521 12217401 fd Linux raid
autodetect
/dev/sdg2 1522 30401 231978600 fd Linux raid
autodetect
$ sudo mdadm --detail /dev/md0 (md1 shows similar info)
/dev/md0:
Version : 00.90.03
Creation Time : Sat Apr 7 23:32:58 2007
Raid Level : raid5
Array Size : 48869120 (46.61 GiB 50.04 GB)
Used Dev Size : 12217280 (11.65 GiB 12.51 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Jan 9 11:35:54 2008
State : clean
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
UUID : e7356e2b:71e53a26:94b87bc7:e6a9e6b2
Events : 0.2601918
Number Major Minor RaidDevice State
0 8 65 0 active sync /dev/sde1
1 8 81 1 active sync /dev/sdf1
2 8 17 2 active sync /dev/sdb1
3 8 1 3 active sync /dev/sda1
4 8 33 4 active sync /dev/sdc1
5 8 97 - spare /dev/sdg1
$ sudo mdadm --examine /dev/sda1 (The other SBs contain info that looks OK)
/dev/sda1:
Magic : a92b4efc
Version : 00.90.00
UUID : e7356e2b:71e53a26:94b87bc7:e6a9e6b2
Creation Time : Sat Apr 7 23:32:58 2007
Raid Level : raid5
Used Dev Size : 12217280 (11.65 GiB 12.51 GB)
Array Size : 48869120 (46.61 GiB 50.04 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Update Time : Wed Jan 9 11:41:29 2008
State : clean
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Checksum : c50df29 - correct
Events : 0.2601918
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 1 3 active sync /dev/sda1
0 0 8 65 0 active sync /dev/sde1
1 1 8 81 1 active sync /dev/sdf1
2 2 8 17 2 active sync /dev/sdb1
3 3 8 1 3 active sync /dev/sda1
4 4 8 33 4 active sync /dev/sdc1
5 5 8 97 5 spare /dev/sdg1
/proc/mdstat:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid5 sdg2[5](S) sde2[0] sda2[3] sdc2[4] sdb2[2] sdf2[1]
927913984 blocks level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]
md0 : active raid5 sdg1[5](S) sde1[0] sdc1[4] sda1[3] sdb1[2] sdf1[1]
48869120 blocks level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]
unused devices: <none>
/etc/mdadm/mdadm.conf
DEVICE partitions
ARRAY /dev/md0 level=raid5 num-devices=5 spares=1
UUID=e7356e2b:71e53a26:94b87bc7:e6a9e6b2
ARRAY /dev/md1 level=raid5 num-devices=5 spares=1
UUID=aa0264a3:5fb0396b:04071607:a713ba9
Dmesg (edited):
[ 36.112449] md: linear personality registered for level -1
[ 36.117197] md: multipath personality registered for level -4
[ 36.121795] md: raid0 personality registered for level 0
[ 36.126950] md: raid1 personality registered for level 1
[ 36.131424] raid5: automatically using best checksumming
function: pIII_sse
[ 36.149971] pIII_sse : 4564.000 MB/sec
[ 36.150020] raid5: using function: pIII_sse (4564.000 MB/sec)
[ 36.218015] raid6: int32x1 780 MB/s
[ 36.285943] raid6: int32x2 902 MB/s
[ 36.353961] raid6: int32x4 667 MB/s
[ 36.421869] raid6: int32x8 528 MB/s
[ 36.489811] raid6: mmxx1 1813 MB/s
[ 36.557775] raid6: mmxx2 2123 MB/s
[ 36.625763] raid6: sse1x1 1101 MB/s
[ 36.693717] raid6: sse1x2 1898 MB/s
[ 36.761688] raid6: sse2x1 2227 MB/s
[ 36.829647] raid6: sse2x2 3178 MB/s
[ 36.829695] raid6: using algorithm sse2x2 (3178 MB/s)
[ 36.829744] md: raid6 personality registered for level 6
[ 36.829793] md: raid5 personality registered for level 5
[ 36.829842] md: raid4 personality registered for level 4
[ 36.853475] md: raid10 personality registered for level 10
[ 39.634924] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors
(250059 MB)
[ 39.634995] sd 0:0:0:0: [sda] Write Protect is off
[ 39.635048] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 39.635076] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 39.635218] sd 0:0:0:0: [sda] 488397168 512-byte hardware sectors
(250059 MB)
[ 39.635292] sd 0:0:0:0: [sda] Write Protect is off
[ 39.635350] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 39.635380] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 39.635462] sda: sda1 sda2
[ 39.650092] sd 0:0:0:0: [sda] Attached SCSI disk
[ 39.650226] sd 1:0:0:0: [sdb] 490234752 512-byte hardware sectors
(251000 MB)
[ 39.650296] sd 1:0:0:0: [sdb] Write Protect is off
[ 39.650348] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 39.650379] sd 1:0:0:0: [sdb] Write cache: disabled, read cache:
enabled, doesn't support DPO or FUA
[ 39.650505] sd 1:0:0:0: [sdb] 490234752 512-byte hardware sectors
(251000 MB)
[ 39.650573] sd 1:0:0:0: [sdb] Write Protect is off
[ 39.650625] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 39.650657] sd 1:0:0:0: [sdb] Write cache: disabled, read cache:
enabled, doesn't support DPO or FUA
[ 39.650727] sdb: sdb1 sdb2
[ 39.667599] sd 1:0:0:0: [sdb] Attached SCSI disk
[ 39.667719] sd 3:0:0:0: [sdc] 490234752 512-byte hardware sectors
(251000 MB)
[ 39.667788] sd 3:0:0:0: [sdc] Write Protect is off
[ 39.667840] sd 3:0:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 39.667871] sd 3:0:0:0: [sdc] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 39.667997] sd 3:0:0:0: [sdc] 490234752 512-byte hardware sectors
(251000 MB)
[ 39.668064] sd 3:0:0:0: [sdc] Write Protect is off
[ 39.668116] sd 3:0:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 39.668146] sd 3:0:0:0: [sdc] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 39.668213] sdc: sdc1 sdc2
[ 39.692703] sd 3:0:0:0: [sdc] Attached SCSI disk
[ 39.699348] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 39.699570] sd 1:0:0:0: Attached scsi generic sg1 type 0
[ 39.699786] sd 3:0:0:0: Attached scsi generic sg2 type 0
[ 39.834560] md: md0 stopped.
[ 39.870361] md: bind<sdc1>
[ 39.870527] md: md1 stopped.
[ 39.910999] md: md0 stopped.
[ 39.911064] md: unbind<sdc1>
[ 39.911120] md: export_rdev(sdc1)
[ 39.929760] md: bind<sda1>
[ 39.929953] md: bind<sdc1>
[ 39.930139] md: bind<sdb1>
[ 39.930231] md: md1 stopped.
[ 39.932468] md: bind<sdc2>
[ 39.932674] md: bind<sda2>
[ 39.932860] md: bind<sdb2>
[ 40.880217] sd 6:0:0:0: [sdd] 234441648 512-byte hardware sectors
(120034 MB)
[ 40.880288] sd 6:0:0:0: [sdd] Write Protect is off
[ 40.880340] sd 6:0:0:0: [sdd] Mode Sense: 00 3a 00 00
[ 40.880367] sd 6:0:0:0: [sdd] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 40.880504] sd 6:0:0:0: [sdd] 234441648 512-byte hardware sectors
(120034 MB)
[ 40.880572] sd 6:0:0:0: [sdd] Write Protect is off
[ 40.880623] sd 6:0:0:0: [sdd] Mode Sense: 00 3a 00 00
[ 40.880651] sd 6:0:0:0: [sdd] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 40.880718] sdd: sdd1 sdd2 <<7>ieee1394: Host added:
ID:BUS[0-00:1023] GUID[001485000012704c]
[ 40.908264] sdd5 >
[ 40.908479] sd 6:0:0:0: [sdd] Attached SCSI disk
[ 40.908579] sd 6:0:0:0: Attached scsi generic sg4 type 0
[ 40.908747] scsi 6:0:1:0: Direct-Access ATA Maxtor
7L250S0 BACE PQ: 0 ANSI: 5
[ 40.908899] sd 6:0:1:0: [sde] 490234752 512-byte hardware sectors
(251000 MB)
[ 40.908968] sd 6:0:1:0: [sde] Write Protect is off
[ 40.909020] sd 6:0:1:0: [sde] Mode Sense: 00 3a 00 00
[ 40.909050] sd 6:0:1:0: [sde] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 40.909174] sd 6:0:1:0: [sde] 490234752 512-byte hardware sectors
(251000 MB)
[ 40.909243] sd 6:0:1:0: [sde] Write Protect is off
[ 40.909294] sd 6:0:1:0: [sde] Mode Sense: 00 3a 00 00
[ 40.909324] sd 6:0:1:0: [sde] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 40.909391] sde: sde1 sde2
[ 40.930218] sd 6:0:1:0: [sde] Attached SCSI disk
[ 40.930318] sd 6:0:1:0: Attached scsi generic sg5 type 0
[ 40.930480] scsi 7:0:0:0: Direct-Access ATA WDC
WD2500JD-00H 08.0 PQ: 0 ANSI: 5
[ 40.930621] sd 7:0:0:0: [sdf] 488397168 512-byte hardware sectors
(250059 MB)
[ 40.930689] sd 7:0:0:0: [sdf] Write Protect is off
[ 40.930742] sd 7:0:0:0: [sdf] Mode Sense: 00 3a 00 00
[ 40.930769] sd 7:0:0:0: [sdf] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 40.930894] sd 7:0:0:0: [sdf] 488397168 512-byte hardware sectors
(250059 MB)
[ 40.930963] sd 7:0:0:0: [sdf] Write Protect is off
[ 40.931015] sd 7:0:0:0: [sdf] Mode Sense: 00 3a 00 00
[ 40.931044] sd 7:0:0:0: [sdf] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 40.931111] sdf: sdf1 sdf2
[ 40.948846] sd 7:0:0:0: [sdf] Attached SCSI disk
[ 40.948946] sd 7:0:0:0: Attached scsi generic sg6 type 0
[ 40.949106] scsi 7:0:1:0: Direct-Access ATA WDC
WD2500JS-00M 02.0 PQ: 0 ANSI: 5
[ 40.949248] sd 7:0:1:0: [sdg] 488397168 512-byte hardware sectors
(250059 MB)
[ 40.949317] sd 7:0:1:0: [sdg] Write Protect is off
[ 40.949368] sd 7:0:1:0: [sdg] Mode Sense: 00 3a 00 00
[ 40.949396] sd 7:0:1:0: [sdg] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 40.949519] sd 7:0:1:0: [sdg] 488397168 512-byte hardware sectors
(250059 MB)
[ 40.949588] sd 7:0:1:0: [sdg] Write Protect is off
[ 40.949640] sd 7:0:1:0: [sdg] Mode Sense: 00 3a 00 00
[ 40.949668] sd 7:0:1:0: [sdg] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 40.949734] sdg: sdg1 sdg2
[ 40.969827] sd 7:0:1:0: [sdg] Attached SCSI disk
[ 40.969926] sd 7:0:1:0: Attached scsi generic sg7 type 0
[ 41.206078] md: md0 stopped.
[ 41.206137] md: unbind<sdb1>
[ 41.206187] md: export_rdev(sdb1)
[ 41.206253] md: unbind<sdc1>
[ 41.206302] md: export_rdev(sdc1)
[ 41.206360] md: unbind<sda1>
[ 41.206408] md: export_rdev(sda1)
[ 41.247389] md: bind<sdf1>
[ 41.247584] md: bind<sdb1>
[ 41.247787] md: bind<sda1>
[ 41.247971] md: bind<sdc1>
[ 41.248151] md: bind<sdg1>
[ 41.248325] md: bind<sde1>
[ 41.256718] raid5: device sde1 operational as raid disk 0
[ 41.256771] raid5: device sdc1 operational as raid disk 4
[ 41.256821] raid5: device sda1 operational as raid disk 3
[ 41.256870] raid5: device sdb1 operational as raid disk 2
[ 41.256919] raid5: device sdf1 operational as raid disk 1
[ 41.257426] raid5: allocated 5245kB for md0
[ 41.257476] raid5: raid level 5 set md0 active with 5 out of 5
devices, algorithm 2
[ 41.257538] RAID5 conf printout:
[ 41.257584] --- rd:5 wd:5
[ 41.257631] disk 0, o:1, dev:sde1
[ 41.257677] disk 1, o:1, dev:sdf1
[ 41.257724] disk 2, o:1, dev:sdb1
[ 41.257771] disk 3, o:1, dev:sda1
[ 41.257817] disk 4, o:1, dev:sdc1
[ 41.257952] md: md1 stopped.
[ 41.258009] md: unbind<sdb2>
[ 41.258060] md: export_rdev(sdb2)
[ 41.258128] md: unbind<sda2>
[ 41.258179] md: export_rdev(sda2)
[ 41.258248] md: unbind<sdc2>
[ 41.258306] md: export_rdev(sdc2)
[ 41.283067] md: bind<sdc2>
[ 41.283297] md: bind<sda2>
[ 41.285235] md: bind<sdb2>
[ 41.306753] md: md1 stopped.
[ 41.306818] md: unbind<sdb2>
[ 41.306878] md: export_rdev(sdb2)
[ 41.306956] md: unbind<sda2>
[ 41.307007] md: export_rdev(sda2)
[ 41.307075] md: unbind<sdc2>
[ 41.307130] md: export_rdev(sdc2)
[ 41.312250] md: bind<sdf2>
[ 41.312476] md: bind<sdb2>
[ 41.312711] md: bind<sdg2>
[ 41.312922] md: bind<sdc2>
[ 41.313138] md: bind<sda2>
[ 41.313343] md: bind<sde2>
[ 41.313452] md: md1: raid array is not clean -- starting
background reconstruction
[ 41.322189] raid5: device sde2 operational as raid disk 0
[ 41.322243] raid5: device sdc2 operational as raid disk 4
[ 41.322292] raid5: device sdg2 operational as raid disk 3
[ 41.322342] raid5: device sdb2 operational as raid disk 2
[ 41.322391] raid5: device sdf2 operational as raid disk 1
[ 41.322823] raid5: allocated 5245kB for md1
[ 41.322872] raid5: raid level 5 set md1 active with 5 out of 5
devices, algorithm 2
[ 41.322934] RAID5 conf printout:
[ 41.322980] --- rd:5 wd:5
[ 41.323026] disk 0, o:1, dev:sde2
[ 41.323073] disk 1, o:1, dev:sdf2
[ 41.323119] disk 2, o:1, dev:sdb2
[ 41.323165] disk 3, o:1, dev:sdg2
[ 41.323212] disk 4, o:1, dev:sdc2
[ 41.323316] md: resync of RAID array md1
[ 41.323364] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
[ 41.323415] md: using maximum available idle IO bandwidth (but
not more than 200000 KB/sec) for resync.
[ 41.323492] md: using 128k window, over a total of 231978496 blocks.
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