== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:10:54 (1787562654)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.474266s, 5.69002MB/s
Read-ahead success for size 8192

1.778822s, 4.71582MB/s
Read-ahead success for size 16384

2.028518s, 4.13534MB/s
Read-ahead success for size 32768

1.829520s, 4.58514MB/s
Read-ahead success for size 65536

1.750473s, 4.7922MB/s
Read-ahead success for size 131072

1.668857s, 5.02656MB/s
Read-ahead success for size 262144

1.580046s, 5.30909MB/s
Read-ahead success for size 524288

1.617467s, 5.18626MB/s
Read-ahead success for size 1048576