== sanity test 101b: check stride-io mode read-ahead =========================================================================== 20:31:11 (1777422671)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

0.812365s, 10.3262MB/s
Read-ahead success for size 8192

0.734238s, 11.4249MB/s
Read-ahead success for size 16384

0.737149s, 11.3798MB/s
Read-ahead success for size 32768

0.750565s, 11.1764MB/s
Read-ahead success for size 65536

0.709184s, 11.8285MB/s
Read-ahead success for size 131072

0.622651s, 13.4724MB/s
Read-ahead success for size 262144

0.589064s, 14.2406MB/s
Read-ahead success for size 524288

0.550143s, 15.2481MB/s
Read-ahead success for size 1048576