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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