I was thinking of adding a raid card, at the moment just using software raid5
dd if=/dev/zero of=zerofile.000 bs=10M count=3200
3200+0 records out
3200+0 records in
33554432000 bytes (34 GB) copied, 200.362 s, 167 MB/s
dd if=zerofile.000 of=/dev/zero bs=10M
3200+0 records in
3200+0 records out
33554432000 bytes (34 GB) copied, 364.289 s, 92.1 MB/s
dd if=/dev/zero of=zerofile.000 bs=10M count=3200
3200+0 records out
3200+0 records in
33554432000 bytes (34 GB) copied, 200.362 s, 167 MB/s
dd if=zerofile.000 of=/dev/zero bs=10M
3200+0 records in
3200+0 records out
33554432000 bytes (34 GB) copied, 364.289 s, 92.1 MB/s