== sanity test 101b: check stride-io mode read-ahead =========================================================================== 20:05:16 (1786752316)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.621928s, 5.172MB/s
Read-ahead success for size 8192

1.661353s, 5.04926MB/s
Read-ahead success for size 16384

1.997820s, 4.19888MB/s
Read-ahead success for size 32768

2.039514s, 4.11304MB/s
Read-ahead success for size 65536

1.386355s, 6.05084MB/s
Read-ahead success for size 131072

1.606856s, 5.22051MB/s
Read-ahead success for size 262144

1.113530s, 7.53335MB/s
Read-ahead success for size 524288

1.082572s, 7.74878MB/s
Read-ahead success for size 1048576