Como reactivar a minha matriz MDADM RAID5?
Acabei de mudar de casa, o que envolveu o desmantelamento do meu servidor e a sua re-conexão. Desde então, uma das minhas matrizes MDADM RAID5 está a aparecer como inactiva:
root@mserver:/tmp# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md1 : active raid5 sdc1[1] sdh1[2] sdg1[0]
3907023872 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
md0 : inactive sdd1[0](S) sdf1[3](S) sde1[2](S) sdb1[1](S)
3907039744 blocks
unused devices: <none>
Parece-me que encontrou todos os discos, mas por alguma razão não os quer utilizar.
Então o que significam as etiquetas (S) e como posso dizer à MDADM para começar a usar o array novamente?
[Editar] Acabei de tentar parar e montar o array com -v
:
root@mserver:~# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
root@mserver:~# mdadm --assemble --scan -v
mdadm: /dev/sde1 is identified as a member of /dev/md0, slot 2.
mdadm: /dev/sdf1 is identified as a member of /dev/md0, slot 3.
mdadm: /dev/sdd1 is identified as a member of /dev/md0, slot 0.
mdadm: /dev/sdb1 is identified as a member of /dev/md0, slot 1.
mdadm: added /dev/sdd1 to /dev/md0 as 0 (possibly out of date)
mdadm: added /dev/sdb1 to /dev/md0 as 1 (possibly out of date)
mdadm: added /dev/sdf1 to /dev/md0 as 3 (possibly out of date)
mdadm: added /dev/sde1 to /dev/md0 as 2
mdadm: /dev/md0 assembled from 1 drive - not enough to start the array.
…e a entrada do gato /proc/mdstat
não parece diferente.
[Edit2] Não tenho a certeza se ajuda mas este é o resultado de examinar cada disco:
root@mserver:~# mdadm –examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver)
Creation Time : Sun Feb 1 20:53:39 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Sat Apr 20 13:22:27 2013
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 6c8f71a3 - correct
Events : 955190
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 17 1 active sync /dev/sdb1
0 0 8 113 0 active sync /dev/sdh1
1 1 8 17 1 active sync /dev/sdb1
2 2 8 97 2 active sync /dev/sdg1
3 3 8 33 3 active sync /dev/sdc1
root@mserver:~# mdadm –examine /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 0.90.00
UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver)
Creation Time : Sun Feb 1 20:53:39 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 2
Preferred Minor : 0
Update Time : Sat Apr 20 18:37:23 2013
State : active
Active Devices : 2
Working Devices : 2
Failed Devices : 2
Spare Devices : 0
Checksum : 6c812869 - correct
Events : 955205
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 113 0 active sync /dev/sdh1
0 0 8 113 0 active sync /dev/sdh1
1 1 0 0 1 faulty removed
2 2 8 97 2 active sync /dev/sdg1
3 3 0 0 3 faulty removed
root@mserver: ~# mdadm –examine /dev/sde1
/dev/sde1:
Magic : a92b4efc
Version : 0.90.00
UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver)
Creation Time : Sun Feb 1 20:53:39 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 2
Preferred Minor : 0
Update Time : Sun Apr 21 14:00:43 2013
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 2
Spare Devices : 0
Checksum : 6c90cc70 - correct
Events : 955219
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 97 2 active sync /dev/sdg1
0 0 0 0 0 removed
1 1 0 0 1 faulty removed
2 2 8 97 2 active sync /dev/sdg1
3 3 0 0 3 faulty removed
``` ```
/dev/sdf1:
Magic : a92b4efc
Version : 0.90.00
UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver)
Creation Time : Sun Feb 1 20:53:39 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Sat Apr 20 13:22:27 2013
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 6c8f71b7 - correct
Events : 955190
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 33 3 active sync /dev/sdc1
0 0 8 113 0 active sync /dev/sdh1
1 1 8 17 1 active sync /dev/sdb1
2 2 8 97 2 active sync /dev/sdg1
3 3 8 33 3 active sync /dev/sdc1
root@mserver:~# mdadm –examine /dev/sdf1
md0 : active raid5 sdb1[1] sdc1[3] sdh1[0] sdg1[2]
2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
Tenho algumas notas que sugerem que as unidades foram originalmente montadas da seguinte forma:
0x1&
[Edit3]
Olhando para o registo parece que aconteceu o seguinte (com base no Update Time
no --examine
resultados):
- sdb e sdf foram eliminados algum tempo depois das 13:22 do dia 20
- sdd foi eliminado algum tempo depois das 18:37 do dia 20
- o servidor foi desligado algum tempo depois das 14:00 no 1º
Dado que dois discos caíram (aparentemente) em simultâneo, penso que deveria ser razoavelmente seguro assumir que o array não teria sido escrito depois desse ponto(?) e por isso deveria ser relativamente seguro forçá-lo a reintegrar na ordem correcta? Qual é o comando mais seguro para fazer isso e existe uma forma de o fazer sem escrever quaisquer alterações?