== sanity test 101b: check stride-io mode read-ahead =========================================================================== 13:37:16 (1780853836)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.037842s, 4.11642MB/s
Read-ahead success for size 8192

2.944201s, 2.8492MB/s
Read-ahead success for size 16384

2.454917s, 3.41706MB/s
Read-ahead success for size 32768

1.969179s, 4.25995MB/s
Read-ahead success for size 65536

2.492694s, 3.36528MB/s
Read-ahead success for size 131072

1.715830s, 4.88895MB/s
Read-ahead success for size 262144

1.210998s, 6.92702MB/s
Read-ahead success for size 524288

1.376412s, 6.09455MB/s
Read-ahead success for size 1048576