== sanity test 101b: check stride-io mode read-ahead =========================================================================== 12:43:12 (1787848992)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.306620s, 6.42008MB/s
Read-ahead success for size 8192

1.451764s, 5.77822MB/s
Read-ahead success for size 16384

1.889845s, 4.43878MB/s
Read-ahead success for size 32768

1.757866s, 4.77204MB/s
Read-ahead success for size 65536

1.503323s, 5.58004MB/s
Read-ahead success for size 131072

1.362331s, 6.15754MB/s
Read-ahead success for size 262144

1.284438s, 6.53096MB/s
Read-ahead success for size 524288

1.298282s, 6.46131MB/s
Read-ahead success for size 1048576