== sanity test 101b: check stride-io mode read-ahead =========================================================================== 06:27:12 (1787394432)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.878976s, 4.46446MB/s
Read-ahead success for size 8192

2.238682s, 3.74712MB/s
Read-ahead success for size 16384

2.713511s, 3.09142MB/s
Read-ahead success for size 32768

2.016677s, 4.15962MB/s
Read-ahead success for size 65536

1.782195s, 4.7069MB/s
Read-ahead success for size 131072

1.424035s, 5.89073MB/s
Read-ahead success for size 262144

1.528306s, 5.48883MB/s
Read-ahead success for size 524288

1.254823s, 6.68509MB/s
Read-ahead success for size 1048576