== sanity test 101b: check stride-io mode read-ahead =========================================================================== 07:03:03 (1781607783)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

0.812776s, 10.3209MB/s
Read-ahead success for size 8192

0.880955s, 9.52218MB/s
Read-ahead success for size 16384

0.904366s, 9.27568MB/s
Read-ahead success for size 32768

0.836178s, 10.0321MB/s
Read-ahead success for size 65536

0.779587s, 10.7603MB/s
Read-ahead success for size 131072

0.879165s, 9.54156MB/s
Read-ahead success for size 262144

0.650463s, 12.8964MB/s
Read-ahead success for size 524288

0.646728s, 12.9708MB/s
Read-ahead success for size 1048576