On 06/07/2013 11:02 PM, Keith Phillips wrote:
> Hi,
>
> I have a problem. I'm worried I may have borked my array :/
>
> I've been running a 3x2TB RAID-5 array and I recently got another 2TB
> drive, intending to bump it up to a 4x2TB RAID-6 array.
>
> I stuck the new disk in and added it to the RAID array, as follows
> ("/files" is on a non-RAID disk):
> mdadm --manage /dev/md0 --add /dev/sda
> mdadm --grow /dev/md0 --raid-devices 4 --level 6
> --backup-file=/files/mdadm-backup
>
> It seemed to work and the grow process started okay, reporting about 3
> days to completion (at ~8MB/s) which seemed really slow, but I left it
> anyway. Next morning, time to complete was several years and the
> kernel had spat out a bunch of I/O errors (lost those logs, sorry).
>
> I figured the new disk must be at fault, because I'd done an array
> check recently and the others seemed okay. Hoping it might abort the
> grow, I failed the new disk:
> mdadm --manage /dev/md0 --fail /dev/sda
>
> But mdadm kept reporting years to completion. So I rebooted.
>
> Now I'd like to know - what state is my array in? If possible I'd like
> to get back to a working 3 disk RAID-5 configuration while I test the
> new disk and figure out what to do with it.
>
> The backup-file doesn't exist, and the stats on the array are as follows:
>
> --------------------------
> cat /proc/mdstat:
> --------------------------
> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
> [raid4] [raid10]
> md0 : inactive sdd[1] sde[3] sdc[0] sda[4]
> 7814054240 blocks super 1.2
>
> unused devices: <none>
> --------------------------
> mdadm --detail /dev/md0
> --------------------------
> /dev/md0:
> Version : 1.2
> Creation Time : Sun Jul 17 00:41:57 2011
> Raid Level : raid6
> Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB)
> Raid Devices : 4
> Total Devices : 4
> Persistence : Superblock is persistent
>
> Update Time : Sat Jun 8 11:00:43 2013
> State : active, degraded, Not Started
> Active Devices : 3
> Working Devices : 4
> Failed Devices : 0
> Spare Devices : 1
>
> Layout : left-symmetric-6
> Chunk Size : 512K
>
> New Layout : left-symmetric
>
> Name : muncher:0 (local to host muncher)
> UUID : 830b9ec8:ca8dac63:e31946a0:4c76ccf0
> Events : 50599
>
> Number Major Minor RaidDevice State
> 0 8 32 0 active sync /dev/sdc
> 1 8 48 1 active sync /dev/sdd
> 3 8 64 2 active sync /dev/sde
> 4 8 0 3 spare rebuilding /dev/sda
>
> --------------------------
>
> Any advice greatly appreciated.
>
> Cheers,
> Keith
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