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Problema con RAID-1
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MoonChild
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Joined: 22 Dec 2009
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PostPosted: Wed Sep 25, 2013 8:07 pm    Post subject: Problema con RAID-1 Reply with quote

Salve,

ho due dischi in raid 1, uno di questi e' passato a miglior vita, cosi' sto cercando
di sostituirlo. quello che succede, dopo aver partizionato, e dato il comando add
di mdadm, dopo circa 5 ore di rebuild, il disco va in spare presentandomi
questo scenario:

darkmoon ~ # cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[0] sdd1[2](S)
2930263928 blocks super 1.2 [2/1] [U_]

unused devices: <none>


Per chiarezza sdd e' il disco nuovo, mentre sdc quello vecchio che funziona.

nel dettaglio:

darkmoon ~ # mdadm --misc --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Feb 5 12:51:54 2013
Raid Level : raid1
Array Size : 2930263928 (2794.52 GiB 3000.59 GB)
Used Dev Size : 2930263928 (2794.52 GiB 3000.59 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Wed Sep 25 21:50:38 2013
State : clean, degraded
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1

Name : darkmoon:0 (local to host darkmoon)
UUID : 6192b029:cd819366:48dee5a1:16834157
Events : 5870

Number Major Minor RaidDevice State
0 8 33 0 active sync /dev/sdc1
1 0 0 1 removed

2 8 49 - spare /dev/sdd1


Ogni volta che riavvio il pc si rifa' le 5 ore di rebuild, e poi la situazione
torna cosi'.

Queste sono le partizioni:

darkmoon ~ # gdisk -l /dev/sdc
GPT fdisk (gdisk) version 0.8.6

Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sdc: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): DD93B646-D978-4A0E-BA29-10D306D91D2C
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2925 sectors (1.4 MiB)

Number Start (sector) End (sector) Size Code Name
1 2048 5860532223 2.7 TiB 0700
darkmoon ~ # gdisk -l /dev/sdd
GPT fdisk (gdisk) version 0.8.6

Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sdd: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 5429244D-EF74-45A3-B719-9971D2AABB84
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2925 sectors (1.4 MiB)

Number Start (sector) End (sector) Size Code Name
1 2048 5860532223 2.7 TiB 0700


L' unica cosa anomala che vedo nei log e' questa:

Sep 25 19:43:18 localhost mdadm[4771]: Rebuild63 event detected on md device /dev/md0
Sep 25 20:22:55 localhost kernel: md/raid1:md0: sdc: unrecoverable I/O read error for block 4160479232
Sep 25 20:22:55 localhost kernel: md: md0: recovery done.
Sep 25 20:22:55 localhost mdadm[4771]: RebuildFinished event detected on md device /dev/md0


Dove pero' l' errore se lo becca sdc che e' l'unico disco che sta funzionando.

Sapete darmi una mano ? Google non aiuta :(

Grazie per l'attenzione.
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djinnZ
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PostPosted: Thu Sep 26, 2013 8:42 am    Post subject: Reply with quote

...ma hai prima eliminato dal raid il disco danneggiato, passando per --fail e poi per --remove, e poi hai aggiunto il nuovo?
Sto parlando di una sequenza come questa, per capirci.

Non vorrei sbagliarmi ma devi rivolgerti a -f -- manage --add (o --continue/--grow --freeze-reshape) o provare prima a correggere l'errore sul disco (lavorando con un array di un solo elmento, con tutti i rischi che la cosa implica) che tu supponi integro.

Una alternativa potrebbe essere dd ma non ricordo quanti blocchi iniziali del disco danneggiato si dovevano ricopiare e resta un approccio balordo.
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