[rhelv6-list] Nasty bug with writing to resyncing RAID-5 Array

Stephen John Smoogen smooge at gmail.com
Fri Jun 22 21:03:23 UTC 2012


On 22 June 2012 14:10, daryl herzmann <akrherz at iastate.edu> wrote:
> Howdy,
>
> The RHEL6.3 release notes have a curious entry:
>
> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.3_Technical_Notes/kernel_issues.html
>
>  kernel component
>
>  Due to a race condition, in certain cases, writes to RAID4/5/6 while the
>  array is reconstructing could hang the system
>
> Wow, I am reproducing it frequently here.  Simply have a RAID-5 software
> array and do some write IO to it, eventually things start hanging and the
> power button needs to be pressed.
>
> Oh man.

Well the race condition they are mentioning should only happen when
the RAID array is reconstructing. This sounds like a different
bug/problem. What kind of disks, type of RAID etc.


> daryl
>
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-- 
Stephen J Smoogen.
"The core skill of innovators is error recovery, not failure avoidance."
Randy Nelson, President of Pixar University.
"Years ago my mother used to say to me,... Elwood, you must be oh
so smart or oh so pleasant. Well, for years I was smart. I
recommend pleasant. You may quote me."  —James Stewart as Elwood P. Dowd




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