== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:55:03 (1786420503)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.817133s, 4.6164MB/s
Read-ahead success for size 8192

1.406328s, 5.9649MB/s
Read-ahead success for size 16384

2.484750s, 3.37604MB/s
Read-ahead success for size 32768

1.348655s, 6.21998MB/s
Read-ahead success for size 65536

1.452807s, 5.77407MB/s
Read-ahead success for size 131072

1.251788s, 6.7013MB/s
Read-ahead success for size 262144

1.212642s, 6.91763MB/s
Read-ahead success for size 524288

0.892776s, 9.39609MB/s
Read-ahead success for size 1048576