Your SAS Array build with some SAS 12 Gb/s drives are slow?
Check disk Write Cache!!
root@Thor:/etc# sdparm -g WCE /dev/sdd
/dev/sdd: HGST HUS726040ALS214 MS00
WCE 0 [cha: y, def: 0, sav: 0]
This shows that the write cache disabled
root@Thor:/etc# sdparm --set=WCE /dev/sdd
/dev/sdd: HGST HUS726040ALS214 MS00
This enables it and my writes returned to the expected speeds
root@Thor:/etc# sdparm -g WCE /dev/sdd
/dev/sdd: HGST HUS726040ALS214 MS00
WCE 1 [cha: y, def: 0, sav: 0]
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