== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:31:36 (1788582696)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.907264s, 4.39824MB/s
Read-ahead success for size 8192

2.454128s, 3.41816MB/s
Read-ahead success for size 16384

3.153427s, 2.66016MB/s
Read-ahead success for size 32768

2.136014s, 3.92723MB/s
Read-ahead success for size 65536

2.686105s, 3.12296MB/s
Read-ahead success for size 131072

1.633620s, 5.13498MB/s
Read-ahead success for size 262144

1.657360s, 5.06143MB/s
Read-ahead success for size 524288

1.485068s, 5.64864MB/s
Read-ahead success for size 1048576