== sanity test 101b: check stride-io mode read-ahead =========================================================================== 16:33:18 (1790973198)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.808129s, 4.63939MB/s
Read-ahead success for size 8192

1.722644s, 4.86961MB/s
Read-ahead success for size 16384

2.642088s, 3.17499MB/s
Read-ahead success for size 32768

2.108077s, 3.97927MB/s
Read-ahead success for size 65536

1.753916s, 4.78279MB/s
Read-ahead success for size 131072

1.905677s, 4.4019MB/s
Read-ahead success for size 262144

1.607546s, 5.21827MB/s
Read-ahead success for size 524288

1.492968s, 5.61875MB/s
Read-ahead success for size 1048576