samsung sm863 vs cephfs rep.1 pool performance

["Marc Roos" <M.Roos@xxxxxxxxxxxxxxxxx>]

Is this result to be expected from cephfs, when comparing to a native ssd speed test.

 

				4k r ran.			4k w ran.			4k r seq.			4k w seq.			1024k r ran.			1024k w ran.			1024k r seq.			1024k w seq.
		size		lat	iops	kB/s	lat	iops	kB/s	lat	iops	MB/s	lat	iops	MB/s	lat	iops	MB/s	lat	iops	MB/s	lat	iops	MB/s	lat	iops	MB/s
Cephfs	ssd rep. 3			2.78	1781	7297	1.42	700	2871	0.29	3314	13.6	0.04	889	3.64	4.3	231	243	0.08	132	139	4.23	235	247	6.99	142	150
Cephfs	ssd rep. 1			0.54	1809	7412	0.8	1238	5071	0.29	3325	13.6	0.56	1761	7.21	4.27	233	245	4.34	229	241	4.21	236	248	4.34	229	241
Samsung	MZK7KM480	480GB		0.09	10.2k	41600	0.05	17.9k	73200	0.05	18k	77.6	0.05	18.3k	75.1	2.06	482	506	2.16	460	483	1.98	502	527	2.13	466	489

(4 nodes, CentOS7, luminous)

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