[rlug] Cum reactivez un raid 5 cu mdadm ?

[Paul Lacatus (Personal)]

La serverul meu de fisiere de acasa mi-a picat sursa .  Pana sa ma prind 
ca e sursa de vina , facea probleme cand erau toate hdd alimentate ,  
s-a dus si centos 6.9 care dadea kernel panic not tainted. Cu ocazia 
asta am reinstalat cu un centos 7.4

treaba e ca acum raid-ul fost /dev/md127 a devenit inactiv :

> [root at datavault ~]# mdadm --detail /dev/md127
> /dev/md127:
>            Version : 0.90
>         Raid Level : raid0
>      Total Devices : 4
>    Preferred Minor : 0
>        Persistence : Superblock is persistent
>
>              State : inactive
>
>               UUID : 188f7506:c03bd2ac:cdc3d78b:f6534f77
>             Events : 0.14838
>
>     Number   Major   Minor   RaidDevice
>
>        -       8        1        -        /dev/sda1
>        -       8       17        -        /dev/sdb1
>        -       8       33        -        /dev/sdc1
>        -       8       49        -        /dev/sdd1

la examinare pe fiecare disc in parte datele par a fi ok dar aria nu 
pleaca din cauza testelor facute  . Trebuie sa recreez aria sau se poate 
reporni ?

>  cat raid.status
> /dev/sda1:
>           Magic : a92b4efc
>         Version : 0.90.00
>            UUID : 188f7506:c03bd2ac:cdc3d78b:f6534f77
>   Creation Time : Sat Dec 18 20:07:41 2010
>      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 : 127
>
>     Update Time : Thu Dec 28 11:38:37 2017
>           State : clean
>  Active Devices : 4
> Working Devices : 4
>  Failed Devices : 0
>   Spare Devices : 0
>        Checksum : 279913d8 - correct
>          Events : 14838
>
>          Layout : left-symmetric
>      Chunk Size : 64K
>
>       Number   Major   Minor   RaidDevice State
> this     3       8        1        3      active sync /dev/sda1
>
>    0     0       8       17        0      active sync /dev/sdb1
>    1     1       8       33        1      active sync /dev/sdc1
>    2     2       8       49        2      active sync /dev/sdd1
>    3     3       8        1        3      active sync /dev/sda1
> /dev/sdb1:
>           Magic : a92b4efc
>         Version : 0.90.00
>            UUID : 188f7506:c03bd2ac:cdc3d78b:f6534f77
>   Creation Time : Sat Dec 18 20:07:41 2010
>      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 : 3
> Preferred Minor : 127
>
>     Update Time : Sat Dec 30 10:19:54 2017
>           State : clean
>  Active Devices : 3
> Working Devices : 3
>  Failed Devices : 1
>   Spare Devices : 0
>        Checksum : 279ba477 - correct
>          Events : 14846
>
>          Layout : left-symmetric
>      Chunk Size : 64K
>
>       Number   Major   Minor   RaidDevice State
> this     0       8       17        0      active sync /dev/sdb1
>
>    0     0       8       17        0      active sync /dev/sdb1
>    1     1       8       33        1      active sync /dev/sdc1
>    2     2       8       49        2      active sync /dev/sdd1
>    3     3       0        0        3      faulty removed
> /dev/sdc1:
>           Magic : a92b4efc
>         Version : 0.90.00
>            UUID : 188f7506:c03bd2ac:cdc3d78b:f6534f77
>   Creation Time : Sat Dec 18 20:07:41 2010
>      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 : 3
> Preferred Minor : 127
>
>     Update Time : Sat Dec 30 10:20:32 2017
>           State : active
>  Active Devices : 3
> Working Devices : 3
>  Failed Devices : 1
>   Spare Devices : 0
>        Checksum : 279b6ab1 - correct
>          Events : 14847
>
>          Layout : left-symmetric
>      Chunk Size : 64K
>
>       Number   Major   Minor   RaidDevice State
> this     1       8       33        1      active sync /dev/sdc1
>
>    0     0       8       17        0      active sync /dev/sdb1
>    1     1       8       33        1      active sync /dev/sdc1
>    2     2       8       49        2      active sync /dev/sdd1
>    3     3       0        0        3      faulty removed
> /dev/sdd1:
>           Magic : a92b4efc
>         Version : 0.90.00
>            UUID : 188f7506:c03bd2ac:cdc3d78b:f6534f77
>   Creation Time : Sat Dec 18 20:07:41 2010
>      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 : 3
> Preferred Minor : 127
>
>     Update Time : Sat Dec 30 10:20:32 2017
>           State : active
>  Active Devices : 3
> Working Devices : 3
>  Failed Devices : 1
>   Spare Devices : 0
>        Checksum : 279b6ac3 - correct
>          Events : 14847
>
>          Layout : left-symmetric
>      Chunk Size : 64K
>
>       Number   Major   Minor   RaidDevice State
> this     2       8       49        2      active sync /dev/sdd1
>
>    0     0       8       17        0      active sync /dev/sdb1
>    1     1       8       33        1      active sync /dev/sdc1
>    2     2       8       49        2      active sync /dev/sdd1
>    3     3       0        0        3      faulty removed
> [root at datavault ~]#