== sanity test 101b: check stride-io mode read-ahead =========================================================================== 12:12:29 (1711987949)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

16.747231s, 0.500895MB/s
Read-ahead success for size 8192

33.786223s, 0.248285MB/s
Read-ahead success for size 16384

10.477289s, 0.800647MB/s
Read-ahead success for size 32768

21.635754s, 0.38772MB/s
Read-ahead success for size 65536

10.666455s, 0.786448MB/s
Read-ahead success for size 131072

11.369035s, 0.737847MB/s
Read-ahead success for size 262144

31.928483s, 0.262731MB/s
Read-ahead success for size 524288

10.185599s, 0.823575MB/s
Read-ahead success for size 1048576