== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:37:39 (1790674659)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

2.114439s, 3.9673MB/s
Read-ahead success for size 8192

2.494633s, 3.36266MB/s
Read-ahead success for size 16384

1.939969s, 4.32409MB/s
Read-ahead success for size 32768

1.816073s, 4.61909MB/s
Read-ahead success for size 65536

1.986839s, 4.22209MB/s
Read-ahead success for size 131072

1.788984s, 4.68903MB/s
Read-ahead success for size 262144

1.482445s, 5.65863MB/s
Read-ahead success for size 524288

1.335680s, 6.2804MB/s
Read-ahead success for size 1048576