Re: MDS cache size limits

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On Fri, Jan 5, 2018 at 3:54 AM, Stefan Kooman <stefan@xxxxxx> wrote:
> 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 :/).

Yup: http://tracker.ceph.com/issues/22599

-- 
Patrick Donnelly
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