== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:48:08 (1783140488)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.724786s, 4.86356MB/s
Read-ahead success for size 8192

1.471047s, 5.70247MB/s
Read-ahead success for size 16384

2.071601s, 4.04934MB/s
Read-ahead success for size 32768

1.673834s, 5.01161MB/s
Read-ahead success for size 65536

1.563416s, 5.36556MB/s
Read-ahead success for size 131072

1.517593s, 5.52757MB/s
Read-ahead success for size 262144

1.248441s, 6.71927MB/s
Read-ahead success for size 524288

1.165051s, 7.20021MB/s
Read-ahead success for size 1048576