Am 15.06.2012 13:34, schrieb Mark Nelson:
On 06/15/2012 04:51 AM, Wido den Hollander wrote:
Hi,
On 15-06-12 07:52, Stefan Priebe - Profihost AG wrote:
Hello list,
i read somewhere that the mon has "special" disk access patterns - even
though it does not write much data.
"special"? Where did you read that? The monitor has about 1 ~ 2GB of
storage.
So if your monitor has something like 4GB ~ 8GB of RAM, your kernel
should cache almost all your monitor data.
I think at some point someone mentioned to me that the mon can cause a
lot of syncs, so running them on the OSDs without syncfs might be
detrimental. For the majority of our internal performance testing I've
kept them off the OSDs just to be sure.
My main idea behind that was what type of disk i need for a performant
mon system. SATA, SAS, SSD? Raid?
Stefan
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