I have a DELL MD1200 connected to a DELL R520 via SAS using a Perc H800
The array used to be a raid 5 with 12x 2tb drives. Ran really well, could get copys going at over 600 MB/s!
Yesterday we removed the raid configuration and replaced the drives with 12x 4tb drives from DELL and since then, performance has been shocking! I am gettin greads of 71MB/s and writes of about 50MB/s
Could you please advise if my settings may be incorrect under Raid 5
Raid 5 across 11 drives with 1x Hotspare
Strip Element Size: 512kb (will mostly be writing veeam backup images to the array)
Read Policy: No Read Ahead
Write Policy: Write Through
Thanks in advance.