Hi, I am evaluating on setting up a cache tier for the rgw index pool and have a few questions regarding that. The rgw index pool is different as it completely stores the data in leveldb. The 'rados df' command on the existing index pool shows size in KB as 0 on a 1 PB cluster with 500 million objects running ceph 0.94.2. Seeking clarifications on the following points: 1. How are the cache tier parameters like target_max_bytes, cache_target_dirty_ratio and cache_target_full_ratio honoured given the size of index pool is shown as 0 and how does flush/eviction take place in this case? Is there any specific reason why the omap data is not reflected in the size, as Sage mentions it here [1] 2. I found a mail archive in ceph-devel where Greg mentions that "there's no cross-OSD LevelDB replication or communication" [2]. In that case, how does ceph handle re-balancing of leveldb instance data in case of node failure? 3. Are there any surprises that can be expected on deploying a cache tier for rgw index pool ? [1] http://www.spinics.net/lists/ceph-devel/msg28635.html [2] http://www.spinics.net/lists/ceph-devel/msg24990.html Thanks Abhishek Varshney -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
