[Lustre-discuss] Future of lustre 1.8.3+

[Gregory Matthews]

Guy Coates wrote:
> One thing to watch out for in your kernel configs is to make sure that:
> 
> CONFIG_SECURITY_FILE_CAPABILITIES=N

I hope this is not the case for the now obsolete:

CONFIG_EXT3_FS_SECURITY=y

which appears to be enabled by default on RHEL5.x

Its not entirely clear to me what this is for but would metadata 
performance be better without it?

GREG

> 
> otherwise you will run into:
> 
> https://bugzilla.lustre.org/show_bug.cgi?id=21439
> 
> (each write call causes 2 getxattr calls, which will pound your MDS into
> the ground).
> 
> The SLES11, debian/lenny and ubuntu kernels all have this feature set,
> so if you are building clients against those kernels, you may be in
> trouble.
> 
> 
> Cheers,
> 
> Guy
> 


-- 
Greg Matthews            01235 778658
Senior Computer Systems Administrator
Diamond Light Source, Oxfordshire, UK