== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:06:08 (1780995968)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.983360s, 4.22949MB/s
Read-ahead success for size 8192

1.558226s, 5.38343MB/s
Read-ahead success for size 16384

2.089938s, 4.01381MB/s
Read-ahead success for size 32768

1.789945s, 4.68652MB/s
Read-ahead success for size 65536

1.407002s, 5.96204MB/s
Read-ahead success for size 131072

1.402234s, 5.98232MB/s
Read-ahead success for size 262144

1.176996s, 7.12713MB/s
Read-ahead success for size 524288

1.174532s, 7.14209MB/s
Read-ahead success for size 1048576