Hi I was doing some testing on erasure coded based CephFS cluster. cluster is running with giant 0.87.1 release.
Cluster info 15 * 36 drives node(journal on same osd) 3 * 4 drives SSD cache node( Intel DC3500) 3 * MON/MDS EC 10 +3 10G Ethernet for private and cluster network We got approx. 55MB/s read transfer speed using ceph-fuse client, when the data was available on cache tier( cold storage was empty). When I tried to add more data, ceph started the flushing the data from cache tier to cold storage. During flushing, cluster read speed became approx 100 KB/s. But I got 50 – 55MB/s write transfer speed during flushing from multiple simultaneous ceph-fuse client( 1G Ethernet). I think there is an issue on data migration from cold storage to cache tier during ceph-fuse client read. Am I hitting any known issue/bug or is there any issue with my cluster? I used big video files( approx 5 GB to 10 GB) for this testing . Any help ? Cheers K.Mohamed Pakkeer
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