I'm running CentOS 7 (XFS filesystem) on a dell server with a PERC H700 raid controller. Inside this server I have 6 x Samsung 850 Evo 250GB SSDs (yes they are consumer drives however, this is a home server. In any case, I performed a DD test and am getting speeds of around 550MB/s which would be the approximate write speed of a single SSD yet these drives are in RAID 10.... where one would expect more.
Output of a write test:
[root@localhost] sync; dd if=/dev/zero of=tempfile bs=1M count=1024; sync 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 1.95942 s, 548 MB/s
Output of a read test:
[root@localhost]# dd if=tempfile of=/dev/null bs=1M count=1024 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 0.171463 s, 6.3 GB/s
Would anyone be able to shed some light on this situation as to whether this is an acceptable write speed? I'm rather puzzled as to what to do here. Appreciate your help :)