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Firstly I'd suggest to inspect bluestore performance counters
before and after adjusting cache parameters (and after running the
same test suite).
Namely:
"bluestore_buffer_bytes"
"bluestore_buffer_hit_bytes"
"bluestore_buffer_miss_bytes"
Is hit ratio (bluestore_buffer_hit_bytes) much different after
data cache increase? Is amount of cached data
(bluestore_buffer_bytes) much different?
Thanks,
Igor
On 7/23/2018 12:50 PM, nokia ceph wrote:
Hi
Team,
We
need a mechanism to have some data cache on OSD build on
bluestore . Is there an option available to enable data
cache?
With
default configurations , OSD logs state that data cache is
disabled by default,
bluestore(/var/lib/ceph/osd/ceph-66)
_set_cache_sizes cache_size 1073741824 meta
0.5 kv 0.5 data 0
We
tried to change the config to have 49% for data and the OSD
logs reflected as following, however don't see any improvement
in iops status.
bluestore(/var/lib/ceph/osd/ceph-66)
_set_cache_sizes cache_size 1073741824 meta
0.01 kv 0.5 data 0.49
Thanks,
Muthu
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