== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:54:12 (1789448052)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.394824s, 6.0141MB/s
Read-ahead success for size 8192

2.574100s, 3.25885MB/s
Read-ahead success for size 16384

2.786025s, 3.01096MB/s
Read-ahead success for size 32768

2.125289s, 3.94704MB/s
Read-ahead success for size 65536

1.625677s, 5.16007MB/s
Read-ahead success for size 131072

1.116260s, 7.51492MB/s
Read-ahead success for size 262144

1.281451s, 6.54618MB/s
Read-ahead success for size 524288

1.083474s, 7.74233MB/s
Read-ahead success for size 1048576