== sanity test 101b: check stride-io mode read-ahead =========================================================================== 16:34:13 (1786566853)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.164820s, 7.20163MB/s
Read-ahead success for size 8192

1.128886s, 7.43087MB/s
Read-ahead success for size 16384

1.387524s, 6.04574MB/s
Read-ahead success for size 32768

1.097551s, 7.64302MB/s
Read-ahead success for size 65536

1.041347s, 8.05554MB/s
Read-ahead success for size 131072

0.994997s, 8.43079MB/s
Read-ahead success for size 262144

0.866820s, 9.67745MB/s
Read-ahead success for size 524288

0.677662s, 12.3787MB/s
Read-ahead success for size 1048576