== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:27:54 (1787034474)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.701922s, 4.9289MB/s
Read-ahead success for size 8192

1.599537s, 5.2444MB/s
Read-ahead success for size 16384

1.872131s, 4.48078MB/s
Read-ahead success for size 32768

1.978471s, 4.23994MB/s
Read-ahead success for size 65536

2.069210s, 4.05401MB/s
Read-ahead success for size 131072

1.693375s, 4.95378MB/s
Read-ahead success for size 262144

1.625362s, 5.16107MB/s
Read-ahead success for size 524288

1.490227s, 5.62908MB/s
Read-ahead success for size 1048576