== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:35:08 (1780385708)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.342647s, 6.24781MB/s
Read-ahead success for size 8192

1.092695s, 7.67699MB/s
Read-ahead success for size 16384

1.294882s, 6.47828MB/s
Read-ahead success for size 32768

1.219346s, 6.8796MB/s
Read-ahead success for size 65536

1.191378s, 7.0411MB/s
Read-ahead success for size 131072

1.272582s, 6.5918MB/s
Read-ahead success for size 262144

0.918129s, 9.13663MB/s
Read-ahead success for size 524288

0.773299s, 10.8478MB/s
Read-ahead success for size 1048576