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List:       evms-devel
Subject:    Re: [Evms-devel] Re: Raid0 errors with non-uniform disk sizes
From:       Steve Dobbelstein <steved () us ! ibm ! com>
Date:       2003-12-30 19:54:24
Message-ID: OF4907DCDF.343BF44A-ON85256E0C.006D0FE3 () us ! ibm ! com
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Mike Snitzer wrote:
> On Tue, Dec 30 2003 at 10:05,
> Steve Dobbelstein <steved@us.ibm.com> wrote:
>
> > It looks to me like this is a problem in the EVMS MD RAID0 plug-in.
The
> > RAID0 plug-in has the same logic as the kernel for calculating which
stripe
> > the data should go on.  The logic is failing when it tries to calculate
the
> > stripe for the last sector.
> >
> > Please run the EVMS UI (evmsgui, evmsn) with the "-d everything" option
to
> > put all debug statements into the log and then send me the log.  With
more
> > details in the log I may be able to figure out why it is failing.
>
> Please see the attached log, this was the result of creating a raid0
> region with the following command:
>
> create:region,MDRaid0RegMgr={chunksize=64KB},sda1,sdb1,sdc1,sdd1
>
> which errors out with (I condensed the whitespace):
> The create command created region: md/md0
> Engine: Error code 5 from write of stop data on object md/md0.
> Engine: Error code 5 from write of stop data on object md/md0.
> I/O error!
>
> Let me know if you need anything else.
>
> Thanks!

Mike,

I looked through the log, comparing the log entries with the source code.
I see log entries that don't follow the source.  I am able to reproduce the
problem on my test machine, which makes it very handy to debug.  I'll let
you know what I find.

Steve D.




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