Grand!
As i dont have space for a cache drive in my DL60 and use SAS disks this really helped out!
Was getting the 40-50mb write over network smb and now its 105mb ish.
What i had tho was to add the save prefix as well for it to kick in
sdparm --set=WCE --save /dev/sda
from https://linux.die.net/man/8/sdparm
To set the "Writeback Cache Enable" bit in the current values page:
sdparm --set=WCE /dev/sda
To set the "Writeback Cache Enable" bit in the current and saved values page:
sdparm --set=WCE --save /dev/sda