== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:15:29 (1784697329)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.258864s, 6.66363MB/s
Read-ahead success for size 8192

1.068815s, 7.84851MB/s
Read-ahead success for size 16384

1.288273s, 6.51151MB/s
Read-ahead success for size 32768

1.129959s, 7.42382MB/s
Read-ahead success for size 65536

0.875275s, 9.58397MB/s
Read-ahead success for size 131072

0.765061s, 10.9646MB/s
Read-ahead success for size 262144

0.736182s, 11.3947MB/s
Read-ahead success for size 524288

0.760223s, 11.0344MB/s
Read-ahead success for size 1048576