== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:26:23 (1787462783)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.292058s, 3.65986MB/s
Read-ahead success for size 8192

2.248810s, 3.73024MB/s
Read-ahead success for size 16384

2.045506s, 4.10099MB/s
Read-ahead success for size 32768

1.717944s, 4.88293MB/s
Read-ahead success for size 65536

1.299050s, 6.45749MB/s
Read-ahead success for size 131072

1.717711s, 4.8836MB/s
Read-ahead success for size 262144

1.577466s, 5.31777MB/s
Read-ahead success for size 524288

1.316656s, 6.37115MB/s
Read-ahead success for size 1048576