== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:47:23 (1788515243)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.389944s, 6.03521MB/s
Read-ahead success for size 8192

1.699318s, 4.93646MB/s
Read-ahead success for size 16384

1.581454s, 5.30436MB/s
Read-ahead success for size 32768

1.478087s, 5.67531MB/s
Read-ahead success for size 65536

1.503894s, 5.57793MB/s
Read-ahead success for size 131072

1.455655s, 5.76277MB/s
Read-ahead success for size 262144

1.408043s, 5.95764MB/s
Read-ahead success for size 524288

1.044023s, 8.03489MB/s
Read-ahead success for size 1048576