== sanity test 101b: check stride-io mode read-ahead =========================================================================== 18:18:32 (1780525112)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

0.482073s, 17.4011MB/s
Read-ahead success for size 8192

0.472985s, 17.7355MB/s
Read-ahead success for size 16384

0.566679s, 14.8031MB/s
Read-ahead success for size 32768

0.547557s, 15.3201MB/s
Read-ahead success for size 65536

0.462448s, 18.1396MB/s
Read-ahead success for size 131072

0.396339s, 21.1652MB/s
Read-ahead success for size 262144

0.392057s, 21.3964MB/s
Read-ahead success for size 524288

0.439366s, 19.0925MB/s
Read-ahead success for size 1048576