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List:       gentoo-user
Subject:    Re: [gentoo-user] A drive in my RAID6 has failed
From:       Paul Hartman <paul.hartman+gentoo () gmail ! com>
Date:       2013-09-06 15:40:19
Message-ID: CAEH5T2PsX67rEkFcnpKLBB8TNTusNkutyRnXinWeeMCMx5QqKQ () mail ! gmail ! com
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On Fri, Sep 6, 2013 at 12:46 AM, Paul Hartman
<paul.hartman+gentoo@gmail.com> wrote:
> So, I simply inserted and partitioned the new drive, added it to the
> array and away we go!
>
> md0 : active raid6 sde1[6] sdd1[5] sdg1[4] sdh1[2] sdf1[1] sdi1[0]
>       11720009728 blocks super 1.2 level 6, 512k chunk, algorithm 2
> [6/5] [UUU_UU]
>       [>....................]  recovery =  2.3% (69513216/2930002432)
> finish=428.7min speed=111206K/sec
>
> When I wake up in the morning, I hope there won't be any errors.

Success! It took 10 hours to rebuild the drive (speeds near the start
of the disk are significantly faster than those near the end of the
disk, so early estimates quoted by /proc/mdstat above were overly
optimistic):

[3720270.120695] md: bind<sde1>
[3720270.162933] RAID conf printout:
[3720270.162942]  --- level:6 rd:6 wd:5
[3720270.162949]  disk 0, o:1, dev:sdi1
[3720270.162954]  disk 1, o:1, dev:sdf1
[3720270.162958]  disk 2, o:1, dev:sdh1
[3720270.162962]  disk 3, o:1, dev:sde1
[3720270.162965]  disk 4, o:1, dev:sdg1
[3720270.162969]  disk 5, o:1, dev:sdd1
[3720270.163060] md: recovery of RAID array md0
[3720270.163067] md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
[3720270.163071] md: using maximum available idle IO bandwidth (but
not more than 200000 KB/sec) for recovery.
[3720270.163085] md: using 128k window, over a total of 2930002432k.
[3756293.459324] md: md0: recovery done.
[3756294.797961] RAID conf printout:
[3756294.797969]  --- level:6 rd:6 wd:6
[3756294.797974]  disk 0, o:1, dev:sdi1
[3756294.797979]  disk 1, o:1, dev:sdf1
[3756294.797982]  disk 2, o:1, dev:sdh1
[3756294.797986]  disk 3, o:1, dev:sde1
[3756294.797989]  disk 4, o:1, dev:sdg1
[3756294.797992]  disk 5, o:1, dev:sdd1

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