[Lustre-discuss] need help debuggin an access permission problem

Tina Friedrich Tina.Friedrich at diamond.ac.uk
Fri Sep 24 06:58:12 PDT 2010

Actually, what I hit was one of the LDAP server private to the MDS 
errounously had a size limit set where the others are unlimited. They're 
round robin'd which is why I was seeing an inermittent effect. So not a 
client issue, the clients would not have used this server for their 

Which is why I'm puzzled as to how this works, and trying to understand 
it a bit better; to my understanding, this should not affect lookups on 
single users, only 'bulk' transfers of data, at least as I understand this?


On 24/09/10 12:35, Daniel Kobras wrote:
> Hi!
> On Fri, Sep 24, 2010 at 09:18:15AM +0100, Tina Friedrich wrote:
>> Cheers Andreas. I had actually found that, but there doesn't seem to be
>> that much documentation about it. Or I didn't find it :) Plus it
>> appeared to find the users that were problematic whenever I tried it, so
>> I wondered if that is all there is, or if there's some other mechanism I
>> could test for.
> Mind that access to cached files is no longer authorized by the MDS, but by the
> client itself. I wouldn't call it documentation, but
> http://wiki.lustre.org/images/b/ba/Tuesday_lustre_automotive.pdf has an
> illustration of why this is a problem when nameservices become out of sync
> between MDS and Lustre clients (slides 23/24). Sounds like you hit a very
> similar issue.
> Regards,
> Daniel.
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Tina Friedrich, Computer Systems Administrator, Diamond Light Source Ltd
Diamond House, Harwell Science and Innovation Campus - 01235 77 8442

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