== sanity test 101b: check stride-io mode read-ahead =========================================================================== 14:42:07 (1782758527)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.730134s, 4.84853MB/s
Read-ahead success for size 8192

1.880132s, 4.46171MB/s
Read-ahead success for size 16384

1.731242s, 4.84543MB/s
Read-ahead success for size 32768

1.705429s, 4.91877MB/s
Read-ahead success for size 65536

1.743276s, 4.81198MB/s
Read-ahead success for size 131072

1.603956s, 5.22995MB/s
Read-ahead success for size 262144

1.423887s, 5.89134MB/s
Read-ahead success for size 524288

1.062800s, 7.89293MB/s
Read-ahead success for size 1048576