== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:22:52 (1787192572)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.941053s, 4.32168MB/s
Read-ahead success for size 8192

1.803689s, 4.65081MB/s
Read-ahead success for size 16384

1.998348s, 4.19777MB/s
Read-ahead success for size 32768

2.009427s, 4.17463MB/s
Read-ahead success for size 65536

1.911217s, 4.38914MB/s
Read-ahead success for size 131072

2.074913s, 4.04287MB/s
Read-ahead success for size 262144

1.524266s, 5.50338MB/s
Read-ahead success for size 524288

1.867060s, 4.49295MB/s
Read-ahead success for size 1048576