Re: strange cache tier behaviour with cephfs

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On Tue, 14 Jun 2016 02:38:27 +0200 Oliver Dzombic wrote:

> Hi,
> 
> if there isnt a problem, why are now 358 objects inside the cache pool
> running multiple times dd if=file of=/dev/zero while every full read of
> this 1.5 GB file produces around 8 objects inside the cache pool.
> 
My response (now invisible, since your client did put the signature not at
the end) was specifically to your flush/evict assumptions.

> Its the same file, read again and again.
>
At this point 358 4MB objects are still shy of the 1.5GB in your file.

So if what Sam wrote is correct, the count will grow a bit more and then
stop around 380 objects.
 
> But at no point its read from the cache.
> 
> Its always read from the cold pool.
> 
How are you determining that?

Christian
-- 
Christian Balzer        Network/Systems Engineer                
chibi@xxxxxxx   	Global OnLine Japan/Rakuten Communications
http://www.gol.com/
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