== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:48:54 (1786762134)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.758482s, 4.77037MB/s
Read-ahead success for size 8192

1.825812s, 4.59445MB/s
Read-ahead success for size 16384

1.685909s, 4.97572MB/s
Read-ahead success for size 32768

1.397596s, 6.00217MB/s
Read-ahead success for size 65536

1.258631s, 6.66487MB/s
Read-ahead success for size 131072

1.090360s, 7.69343MB/s
Read-ahead success for size 262144

1.151137s, 7.28724MB/s
Read-ahead success for size 524288

1.266517s, 6.62337MB/s
Read-ahead success for size 1048576