== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:52:40 (1784188360)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

2.267933s, 3.69879MB/s
Read-ahead success for size 8192

1.955503s, 4.28974MB/s
Read-ahead success for size 16384

2.444997s, 3.43093MB/s
Read-ahead success for size 32768

1.892468s, 4.43263MB/s
Read-ahead success for size 65536

1.545579s, 5.42749MB/s
Read-ahead success for size 131072

1.993705s, 4.20755MB/s
Read-ahead success for size 262144

1.679869s, 4.99361MB/s
Read-ahead success for size 524288

1.540022s, 5.44707MB/s
Read-ahead success for size 1048576