Re: RAID6 data-check took almost 2 hours, clicking sounds, system unresponsive

[Gavin Flower <gavinflower@yahoo.com>]

--- On Fri, 8/4/11, NeilBrown <neilb@suse.de> wrote:

> From: NeilBrown <neilb@suse.de>
> Subject: Re: RAID6 data-check took almost 2 hours, clicking sounds, system unresponsive
> To: "Gavin Flower" <gavinflower@yahoo.com>
> Cc: linux-raid@vger.kernel.org
> Date: Friday, 8 April, 2011, 21:34
> On Thu, 7 Apr 2011 18:32:04 -0700
> (PDT) Gavin Flower <gavinflower@yahoo.com>
> wrote:
> 
> > Hi Neil,
> > 
> > My original email may have been eaten: as it did not
> appear on the list, nor did I get an error message
> back.  So perhaps there was a problem with the attached
> files.
> > 
> > I will resend the attachments one at a time in
> separate emails.
> > 
> > 
> > Cheers,
> > Gavin
> > 
> > [begin original]
> > Hi Neil,
> > 
> > Your help (or anybody else's) would be greatly
> appreciated, yet again
> 
> Hi Gavin,
>  it isn't clear to me what help you want.
> 
> Obviously there is some sort of hardware issue - possible a
> drive, possibly a
> bus problem - I really don't know.
> 
> Apart from that things look normal.
> 
> What exactly did you want explained?
> 
> NeilBrown

I guess I was surprised that the RAID system appeared normal and that it did not register any errors.  I was hoping to get an idea as to which drive was problematic.

I get the feeling, from your reply, that this is not specifically a RAID problem, that it just happens to affect a RAID array.

I had thought that the RAID system should have been able to give me better diagnostics, but possibly I am being (inadvertently) unreasonable!

Not sure what the significance of this mismatch is, and what I should do about it.
# cat /sys/block/md2/md/mismatch_cnt 
28904 
# 


Thanks,
Gavin

> > 
> > This morning, I noticed my system was extremely
> unresponsive, and that there were clicking sounds coming
> from one of my 5 hard drives.  Also that there was
> excessive disk I/O even for trivial things like bring up a
> directory window, and lots of ata3 errors being reported to
> the system log.  These symptoms were mostly during a
> raid check process.
> > 
> > Somewhere along the way, I seemed to have lost my swap
> partition!
> > 
> > So I did some extensive investigations, which took
> most of the day.  My notes were created in OpenDocument
> format using LibreOffice, but I have converted them to txt
> format for the include - but I can supply the ,odt file if
> requested.
> > 
> > I Have included 2 files:
> >               
> my notes: raid-notes-20110407a.txt
> >    selected log entries:
> messages-gcf-20110407-ATA
> > 
> > If there are some additional diagnostics that might
> prove useful, please let me know.
> > 
> > 
> > Cheers,
> > Gavin
> > [end original]
> > --
> > All Adults share the Responsibility
> > to help Raise Today's Children,
> > for they are Tomorrow's Society!
> > --
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> 
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