== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:59:02 (1787468342)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.553447s, 5.4MB/s
Read-ahead success for size 8192

1.629846s, 5.14687MB/s
Read-ahead success for size 16384

2.567143s, 3.26768MB/s
Read-ahead success for size 32768

1.710832s, 4.90323MB/s
Read-ahead success for size 65536

1.769965s, 4.73942MB/s
Read-ahead success for size 131072

1.190484s, 7.04638MB/s
Read-ahead success for size 262144

1.355559s, 6.1883MB/s
Read-ahead success for size 524288

1.808186s, 4.63924MB/s
Read-ahead success for size 1048576