== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:26:50 (1734672410)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

12.968281s, 0.646856MB/s
Read-ahead success for size 8192

12.752230s, 0.657815MB/s
Read-ahead success for size 16384

12.563960s, 0.667672MB/s
Read-ahead success for size 32768

12.983918s, 0.646077MB/s
Read-ahead success for size 65536

12.991026s, 0.645723MB/s
Read-ahead success for size 131072

11.874585s, 0.706434MB/s
Read-ahead success for size 262144

10.975043s, 0.764335MB/s
Read-ahead success for size 524288

10.124111s, 0.828577MB/s
Read-ahead success for size 1048576