== sanity test 101b: check stride-io mode read-ahead =========================================================================== 12:42:16 (1788799336)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.425843s, 5.88326MB/s
Read-ahead success for size 8192

1.774466s, 4.7274MB/s
Read-ahead success for size 16384

2.056268s, 4.07953MB/s
Read-ahead success for size 32768

1.962868s, 4.27365MB/s
Read-ahead success for size 65536

2.083586s, 4.02604MB/s
Read-ahead success for size 131072

1.372636s, 6.11131MB/s
Read-ahead success for size 262144

1.439124s, 5.82897MB/s
Read-ahead success for size 524288

1.314435s, 6.38191MB/s
Read-ahead success for size 1048576