[DRBD-user] drbd uml 2.6.6

[Matteo Centonza]

On Thu, 13 May 2004, Mark Olliver wrote:

> >drbd related:
> >
> >  drbd seems to work fine, as well as module, and as "monolithic" build.
> >
> >  XFS seems to work on top of DRBD within uml, and survives a tiobench.
> >  but sometimes, if you copy many files, it get stuck waiting for some xfs
> >  internal semaphore to be released, which never happens.
> >
> >  this only shows on top of drbd, not using the underlying ubd directly,
> >  but seems to be a xfs internal problem, since it even shows when DRBD
> >  is "virgin standalone", just passing request to the lower level device,
> >  and passing end_io events up to the upper levels. with a recently
> >  introduce atomic counter I can *prove* that drbd did the correct endio.
> >
> >  only xfs seems to not up its own semaphore properly...
> >  as soon as this is reproducable in real systems (where currently xfs on
> >  top of DRBD seems to have all sorts of other weird problems, which I
> >  doubt are DRBDs fault... only xfs does not expect the restrictions that
> >  the DRBD requests queue imposes), this needs to be sorted out with the
> >  XFS guys... 

maybe it's related to this:

http://marc.theaimsgroup.com/?l=linux-xfs&m=108434513705289&w=2

-m