scylla_io_setup: adjust values for i3en instances
scylla_io_setup: adjust values for i3en instances

Apparently we are having some issues running iotune in the i3en instances,
as the values not always make sense. We believe it is something that XFS
is doing, and running fio directly on the device (no filesystem) provides
more meaningful results (more according to AWS published expected values).

For now, let's use fio instead. In this patch I have ran fio for our 4
dimensions in each of the three types of disks (large, xlarge, 3xlarge).

Signed-off-by: Glauber Costa <7ba9037b0dd006f9408bd45b94707becd5cd4e87@scylladb.com>
Message-Id: <20190524111454.27956-1-7ba9037b0dd006f9408bd45b94707becd5cd4e87@scylladb.com>

avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla