== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:36:43 (1788842203)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.793827s, 4.67638MB/s
Read-ahead success for size 8192

1.709356s, 4.90747MB/s
Read-ahead success for size 16384

1.941209s, 4.32133MB/s
Read-ahead success for size 32768

1.635515s, 5.12903MB/s
Read-ahead success for size 65536

1.352838s, 6.20075MB/s
Read-ahead success for size 131072

1.646799s, 5.09389MB/s
Read-ahead success for size 262144

1.032527s, 8.12435MB/s
Read-ahead success for size 524288

1.095686s, 7.65603MB/s
Read-ahead success for size 1048576