On 08/14/2014 10:30 PM, Sage Weil wrote: > On Thu, 14 Aug 2014, Pawe? Sadowski wrote: >> W dniu 14.08.2014 17:20, Sage Weil pisze: >>> On Thu, 14 Aug 2014, Pawe? Sadowski wrote: >>>> Hello, >>>> >>>> I've a cluster of 35 OSD (30 HDD, 5 SSD) with cache tiering configured. >>>> During tests it looks like ceph is not respecting target_max_bytes >>>> settings. Steps to reproduce: >>>> - configure cache tiering >>>> - set target_max_bytes to 32G (on hot pool) >>>> - write more than 32G of data >>>> - nothing happens > <snip details> > > The reason the agent is doing work is because you don't have > hit_set_* configured for the cache pool, which means the cluster isn't > tracking what objects get read to inform the flush/evict > decisions. Configuring that will fix this. Try > > ceph osd pool set cache hit_set_type bloom > ceph osd pool set cache hit_set_count 8 > ceph osd pool set cache hit_set_period 3600 > > or similar. > > The agent could still run in a brain-dead mode without it, but it suffers > from the bug you found. That was fixed after 0.80.5 and will be in > 0.80.6. Thanks! PS
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