Re: Raid Checks

[NeilBrown <neilb@suse.de>]

On Sun, 03 Apr 2011 09:48:47 +0100 Jonathan Tripathy <jonnyt@abpni.co.uk>
wrote:

> 
> On 03/04/11 09:31, Jonathan Tripathy wrote:
> > Hi Everyone,
> >
> > I'm running CentOS 5.5 which a stock version of mdadm. I have 2 
> > physical disks in a RAID1 setup. Each disk has 4 md partitions on it.
> >
> > I'm experiencing the issues associated with the raid-check script 
> > every Sunday morning, where whatever is happening, a re-sync happens. 
> > Doing a little reading around Google, I see that this is probably 
> > caused by the mismatch_cnt being non-zero, which apparently is normal 
> > for RAID1 devices. According to this bug:
> >
> > https://bugzilla.redhat.com/show_bug.cgi?id=566828
> >
> > someone has made a patch for RedHat so that mismatch_cnt isn't checked 
> > on RAID1 setups. However, since I don't use RedHat, and I don't really 
> > want to compile mdadm from scratch, is there a workaround for this? I 
> > don't want to just disable the raid-check script, as I think it does 
> > some other important checks which are useful for RAID1.
> >
> > Any help would be appreciated
> >
> > Thanks
> >
> Seems like I'm a little confused...
> 
> To apply that patch, I don't need to re-compile, as it's just a script 
> run by cron. However, looking at the script, it may not fix my "resync" 
> issue which is happening every Sunday. Looks like that script just stops 
> the mismatch warning email from being sent.
> 
> My main concern, is that during these resyncs, I loose redundancy, don't I?

No.

NeilBrown

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