== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:16:40 (1787368600)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.449425s, 5.78754MB/s
Read-ahead success for size 8192

1.829085s, 4.58623MB/s
Read-ahead success for size 16384

1.639124s, 5.11774MB/s
Read-ahead success for size 32768

1.258315s, 6.66654MB/s
Read-ahead success for size 65536

1.502177s, 5.5843MB/s
Read-ahead success for size 131072

1.284377s, 6.53127MB/s
Read-ahead success for size 262144

1.282088s, 6.54293MB/s
Read-ahead success for size 524288

1.311035s, 6.39846MB/s
Read-ahead success for size 1048576