Re: MDS cache size limits

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Quoting Patrick Donnelly (pdonnell@xxxxxxxxxx):
> 
> It's expected but not desired: http://tracker.ceph.com/issues/21402
> 
> The memory usage tracking is off by a constant factor. I'd suggest
> just lowering the limit so it's about where it should be for your
> system.

Thanks for the info. Yeah, we did exactly that (observe and adjust
setting accordingly). Is this something worth
mentioning in the documentation? Escpecially when this "factor" is a
constant? Over time (with issue 21402 being worked on) things will
change. Ceph operators will want to make use of as much cache as
possible without overcommitting (MDS won't notice until there is no more
memory left, restart, and looses all its cache :/).

Gr. Stefan

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