write performance per disk

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On 04/07/14 02:32, VELARTIS Philipp D?rhammer wrote:

> Ceph.conf:
>          rbd cache = true
>          rbd cache size = 2147483648
>          rbd cache max dirty = 1073741824

Just a FYI - I posted a setting very like this in another thread, and 
remarked that it was "aggressive" - probably too much so for any but 
single purpose benchmarks using a handful of VMs - as it will add 2G to 
the memory footprint of *each* one [1]. If that was your intention, no 
worries - but I thought I should clarify it before I'm responsible for 
everyone eating all their RAM :-)

Cheers

Mark


[1] e.g your qemu-system-x86_64 will expand its memory consumption by 
approx this amount.


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