linux-kernel - Re: BUG:write data to degrade raid5

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Message-ID: <4BA4EED7.5070700@tmr.com>
Date:	Sat, 20 Mar 2010 11:50:47 -0400
From:	Bill Davidsen <davidsen@....com>
To:	jin zhencheng <zhenchengjin@...il.com>
CC:	neilb@...e.de, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: BUG:write data to degrade raid5

jin zhencheng wrote:
> hi;
>
> i use kernel is 2.6.26.2
>
> what i do as follow:
>
> 1, I create a raid5:
> mdadm -C /dev/md5 -l 5 -n 4 /dev/sda /dev/sdb /dev/sdc  /dev/sdd
> --metadata=1.0 --assume-clean
>
> 2, dd if=/dev/zero of=/dev/md5 bs=1M &
>
> write data to this raid5
>
> 3, mdadm --manage /dev/md5 -f /dev/sda
>
> 4 mdadm --manage  /dev/md5 -f /dev/sdb
>
> if i faild 2 disks ,then the OS kernel display OOP error and kernel down
>
>
> do somebody know why ?
>
> Is MD/RAID5 bug ?
>   

I would usually say that any kernel OOPS is a bug, but in this case, 
what are you running your Linux on, given that you just trashed the 
first four drives? While it's possible to run off of other drives, you 
have to make an effort to configure Linux to do so.

-- 
Bill Davidsen <davidsen@....com>
  "We can't solve today's problems by using the same thinking we
   used in creating them." - Einstein

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