Ubuntu Server 14.04.3 LTSには、合計容量が4 TBの3つのディスクRAID 5 mdadmアレイがあります。
アレイに関連付けられていない交換デバイスによって引き起こされるカーネルパニックのために再起動するたびに、アレイは[UU_]起動します。私が見つけた一時的な解決策は、mdadm --add /dev/md0 /dev/sdd1再構築が開始され、再構築が成功したときに実行することでした。
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sdd1[4] sdb1[3] sdc1[1]
3906763776 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
unused devices: <none>
しかし、再起動するたびにこれを行う必要があり、ディスク番号が2、1、0ではなく4、3、1で間違っているようです。
root@Bt-Networks-Server:~# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Fri Aug 1 00:53:53 2014
Raid Level : raid5
Array Size : 3906763776 (3725.78 GiB 4000.53 GB)
Used Dev Size : 1953381888 (1862.89 GiB 2000.26 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Mon Oct 26 17:40:43 2015
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : Bt-Networks-Server:0 (local to host Bt-Networks-Server)
UUID : 4e860a9e:0b433a00:54d2c991:78ca3d15
Events : 83137
Number Major Minor RaidDevice State
4 8 49 0 active sync /dev/sdd1
1 8 33 1 active sync /dev/sdc1
3 8 17 2 active sync /dev/sdb1
また、新しいディスクではなくディスクを取り出すことに関するdmesgで、次の情報が見つかりました。
[ 2.430966] md: raid1 personality registered for level 1
[ 2.500019] raid6: sse2x1 3900 MB/s
[ 2.568110] raid6: sse2x2 4957 MB/s
[ 2.582322] md: bind<sdc1>
[ 2.583992] md: bind<sdd1>
[ 2.608030] usb 6-2: new low-speed USB device number 2 using uhci_hcd
[ 2.619248] md: bind<sdb1>
[ 2.620098] md: kicking non-fresh sdd1 from array!
[ 2.620103] md: unbind<sdd1>
[ 2.636013] raid6: sse2x4 6926 MB/s
[ 2.636015] raid6: using algorithm sse2x4 (6926 MB/s)
[ 2.636017] raid6: using ssse3x2 recovery algorithm
[ 2.637624] xor: measuring software checksum speed
[ 2.664021] usb 7-1: new low-speed USB device number 2 using uhci_hcd
[ 2.676012] prefetch64-sse: 10026.000 MB/sec
[ 2.716011] generic_sse: 8868.000 MB/sec
[ 2.716013] xor: using function: prefetch64-sse (10026.000 MB/sec)
[ 2.717321] async_tx: api initialized (async)
[ 2.725129] md: raid6 personality registered for level 6
[ 2.725131] md: raid5 personality registered for level 5
[ 2.725133] md: raid4 personality registered for level 4
[ 2.728509] md: export_rdev(sdd1)
[ 2.729556] md/raid:md0: device sdb1 operational as raid disk 2
[ 2.729559] md/raid:md0: device sdc1 operational as raid disk 1
[ 2.729927] md/raid:md0: allocated 0kB
[ 2.729976] md/raid:md0: raid level 5 active with 2 out of 3 devices, algorithm 2
[ 2.729983] RAID conf printout:
[ 2.729984] --- level:5 rd:3 wd:2
[ 2.729986] disk 1, o:1, dev:sdc1
[ 2.729988] disk 2, o:1, dev:sdb1
[ 2.730030] md0: detected capacity change from 0 to 4000526106624
[ 2.731863] md: raid10 personality registered for level 10
[ 2.755618] md0: unknown partition table
[ 2.812332] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
以下を更新してmdadm.confを再確認しました。
root@Bt-Networks-Server:~# mdadm --detail --scan
ARRAY /dev/md/0 metadata=1.2 name=Bt-Networks-Server:0 UUID=4e860a9e:0b433a00:54d2c991:78ca3d15
設定ファイルに保存し、update-initramfs -uを実行します。
再起動するたびにアレイを追加して再構築/再同期するのを防ぐことができるソリューションはありますか？
ありがとうございます！
編集する：
/etc/mdadm/mdadm.confの内容：
root@Bt-Networks-Server:~# cat /etc/mdadm/mdadm.conf
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default (built-in), scan all partitions (/proc/partitions) and all
# containers for MD superblocks. alternatively, specify devices to scan, using
# wildcards if desired.
#DEVICE partitions containers
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# instruct the monitoring daemon where to send mail alerts
MAILADDR root
# definitions of existing MD arrays
# This file was auto-generated on Thu, 31 Jul 2014 23:42:00 -0300
# by mkconf $Id$
#ARRAY /dev/md/Bt-Networks-Server:0 metadata=1.2 name=Bt-Networks-Server:0 UUID=4e860a9e:0b433a00:54d2c991:78ca3d15
ARRAY /dev/md/0 metadata=1.2 UUID=4e860a9e:0b433a00:54d2c991:78ca3d15 name=Bt-Networks-Server:0
dmesgで検索して回復関連ログを検索する
[ 185.105099] md: export_rdev(sdd1)
[ 185.220543] md: bind<sdd1>
[ 185.320114] RAID conf printout:
[ 185.320118] --- level:5 rd:3 wd:2
[ 185.320121] disk 0, o:1, dev:sdd1
[ 185.320123] disk 1, o:1, dev:sdc1
[ 185.320124] disk 2, o:1, dev:sdb1
[ 185.320272] md: recovery of RAID array md0
[ 185.320276] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
[ 185.320278] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for recovery.
[ 185.320281] md: using 128k window, over a total of 1953381888k.
[ 1009.812057] EXT4-fs (md0): recovery complete
[ 1009.896520] EXT4-fs (md0): mounted filesystem with ordered data mode. Opts: (null)
[ 1109.136229] perf interrupt took too long (2503 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[19295.440128] md: md0: recovery done.
[19295.607089] RAID conf printout:
[19295.607096] --- level:5 rd:3 wd:3
[19295.607099] disk 0, o:1, dev:sdd1
[19295.607101] disk 1, o:1, dev:sdc1
[19295.607103] disk 2, o:1, dev:sdb1
また、正常な定期的なアレイ検査に関するいくつかのデータも発見されました。
[501643.369779] md: data-check of RAID array md0
[501643.369784] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
[501643.369786] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
[501643.369791] md: using 128k window, over a total of 1953381888k.
[518452.072029] md: md0: data-check done.