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From: Wols Lists <antlists@youngman.org.uk>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: linux-raid@vger.kernel.org
Subject: Re: Issue removing failed drive and re adding on raid 6
Date: Sat, 04 Jul 2015 10:23:06 +0100	[thread overview]
Message-ID: <5597A5FA.8000204@youngman.org.uk> (raw)
In-Reply-To: <alpine.DEB.2.02.1507041009040.11810@uplift.swm.pp.se>

On 04/07/15 09:10, Mikael Abrahamsson wrote:
> 
>> Make sure you've got your raid timeout increased - there's plenty of
>> threads about how to do it - otherwise one disk hiccup for any reason
>> is likely to cause a cascade of failures !!!!
> 
> I recommend this as minimum (in rc.local for instance):
> 
> for x in /sys/block/sd[a-z] ; do
>         echo 180  > $x/device/timeout
> done
> 
> echo 4096 > /sys/block/md0/md/stripe_cache_size

If you didn't do this, this could EASILY explain your problems. 7 disks
is 21TB of data. That pretty much *guarantees* TWO soft errors. Each
error will kick a disk from the array. Plus the drive you're replacing
that makes your raid 6 short by 3 drives. OOOOPPPSS.

Cheers,
Wol

  reply	other threads:[~2015-07-04  9:23 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-03 15:44 Issue removing failed drive and re adding on raid 6 Justin Stephenson
2015-07-03 20:47 ` Mikael Abrahamsson
2015-07-03 22:20   ` Re[2]: " Justin Stephenson
2015-07-04  5:11     ` Mikael Abrahamsson
2015-07-04  6:10       ` Re[3]: " Justin Stephenson
2015-07-04  6:58         ` Mikael Abrahamsson
2015-07-04  7:12           ` Re[4]: " Justin Stephenson
2015-07-04  7:25             ` Mikael Abrahamsson
2015-07-04  7:58         ` Wols Lists
2015-07-04  8:10           ` Mikael Abrahamsson
2015-07-04  9:23             ` Wols Lists [this message]
2015-07-05 10:27             ` Roman Mamedov
2015-07-06  0:15             ` Re[2]: " Justin Stephenson
2015-07-04 16:38           ` Justin Stephenson
2015-07-05 22:58             ` Thomas Fjellstrom

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