[Lustre-discuss] Out of Memory on MDS

[Roger Spellman]

Thanks Cliff.

The servers are 1.6.7.1.  The clients are a mix of 1.6.7.1 and 1.6.6.

Is lru_size an upper limit on the number of entries?

Also, lru_max_age does not seem to be working.  I set it to 10 seconds,
and it did not clean anything up.

-Roger

> 
> Roger Spellman wrote:
> > I have an MDS that is crashing with out-of-memory.
> >
> > Prior to the crash, I started collecting /proc/slabinfo.  I see that
> > ldlm_locks is up to 4,500,000, and each one is 512 bytes, for a
total of
> > 2.2GB, which is more than half my RAM.
> >
> > Is there a way to limit this?
> 
> You don't mention the version of Lustre - lru_size might have an
impact,
> i am not certain. I believe it is the only lock tuneable of note. (and
> is auto-sized in recent Lustre)
> 
> cliffw
> 
> >