== sanity test 101b: check stride-io mode read-ahead =========================================================================== 09:53:17 (1787838797)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.231660s, 6.81081MB/s
Read-ahead success for size 8192

1.537446s, 5.4562MB/s
Read-ahead success for size 16384

1.642567s, 5.10701MB/s
Read-ahead success for size 32768

1.904598s, 4.4044MB/s
Read-ahead success for size 65536

1.030586s, 8.13965MB/s
Read-ahead success for size 131072

1.675357s, 5.00706MB/s
Read-ahead success for size 262144

1.512157s, 5.54745MB/s
Read-ahead success for size 524288

1.200566s, 6.98721MB/s
Read-ahead success for size 1048576