On 08/19/2015 10:58 AM, Nick Fisk wrote:
-----Original Message-----
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of
Jacek Jarosiewicz
Sent: 19 August 2015 09:29
To: ceph-users@xxxxxxxx
Subject: requests are blocked - problem
I would suggest running the fio tests again, just to make sure that there isn't a problem with your newer config, but I suspect you will see equally bad performance with the fio tests now that the cache tier has begun to be more populated.
Ok, I did the tests and You're right - the full cache was the problem.
After flushing cache and running fio results are again good (fast).
Is there a way to tune the cache parameters so that the whole cluster
doesn't slow down that much and doesn't block requests?
We use defaults for the cache pool from the documentation:
hit_set_period 3600
cache_min_flush_age 600
cache_min_evict_age 1800
J
--
Jacek Jarosiewicz
Administrator Systemów Informatycznych
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