[Lustre-discuss] md and mdadm in 1.8.7-wc1

[Samuel Aparicio]

Thanks for this.

we have zero experience of patching lustre 1.8.7 against newer kernels, are there any known pitfalls we should avoid.


Professor Samuel Aparicio BM BCh PhD FRCPath
Nan and Lorraine Robertson Chair UBC/BC Cancer Agency
675 West 10th, Vancouver V5Z 1L3, Canada.
office: +1 604 675 8200 lab website http://molonc.bccrc.ca







On Mar 20, 2012, at 9:25 AM, Joe Landman wrote:

> On 03/20/2012 12:18 PM, Samuel Aparicio wrote:
>> Hello, thanks for this - it's a 16 disk raid10 (with one spare) so 24Tb.
>> I previously tried 1.0 and 1.2 metadata, to no effect.
>> we are using 256 chunk sizes, I haven't tried reverting to 64k but will
>> do so.
>> 
>> this looks to me like something different - there was an md patch for
>> 2.6.18 kernels relating to updating of superblocks on arrays,
>> which this might be ...
>> 
>> the storage vendor has tried md with 3Tb disks and md version 3.2.3 and
>> sees no problems, but this is also with a much later kernel version.
>> I am not sure 3.2.3 would work with kernels as old as 2.6.18-274
> 
> It will, but the issue is more than likely the age of the kernel 
> combined with driver issues.  We'd tried AoE in the dim and distant 
> past, and found all manner of corruption problems we couldn't work around.
> 
> If you can update to a newer kernel, this might be a better course. 
> 1.8.7+ builds against some of the more modern kernels.  I don't think 
> we've posted a build against our 2.6.32.58.scalable kernel, but I'll 
> look into it.
> 
> 
> -- 
> Joseph Landman, Ph.D
> Founder and CEO
> Scalable Informatics Inc.
> email: landman at scalableinformatics.com
> web  : http://scalableinformatics.com
>        http://scalableinformatics.com/sicluster
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