Hello , Cephfs operations are slow in our cluster , I see low number of operations or throughput in the pools and all other resources as well. I think it is MDS operations that are causing the issue. I increased mds_cache_memory_limit to 3 GB from 1 GB but not seeing any improvements in the user access times. How do I monitor the MDS operations like metadata operations latencies including inode access times update time and directory operations latencies ? we am using 14.2.3 ceph version. I have increased mds_cache_memory_limit but not sure how to check what is been used and how effectively we are using it. # ceph config get mds.0 mds_cache_memory_limit 3221225472 I also see this , we are maninging PG using autoscale , however I see BIAS as 4.0 where as all pools have 1.0 not sure what is this number exactly and how it effect cluster . # ceph osd pool autoscale-status | egrep "cephfs|POOL" POOL SIZE TARGET SIZE RATE RAW CAPACITY RATIO TARGET RATIO BIAS PG_NUM NEW PG_NUM AUTOSCALE cephfs01-metadata 1775M 3.0 167.6T 0.0000 4.0 8 on cephfs01-data0 739.5G 3.0 167.6T 0.0129 1.0 32 on There is one large OMAP. [root@knode25 /]# ceph health detail HEALTH_WARN 1 large omap objects LARGE_OMAP_OBJECTS 1 large omap objects 1 large objects found in pool 'cephfs01-metadata' Search the cluster log for 'Large omap object found' for more details. I recently had similar one and I was able to remove that by running deep scrub , not sure why they are keep forming and how to solve this for good ? Thanks, Uday.