== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:51:06 (1780383066)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.094992s, 7.66089MB/s
Read-ahead success for size 8192

1.696168s, 4.94562MB/s
Read-ahead success for size 16384

1.592776s, 5.26666MB/s
Read-ahead success for size 32768

1.642800s, 5.10629MB/s
Read-ahead success for size 65536

1.821570s, 4.60515MB/s
Read-ahead success for size 131072

1.503784s, 5.57833MB/s
Read-ahead success for size 262144

1.688205s, 4.96895MB/s
Read-ahead success for size 524288

1.297187s, 6.46677MB/s
Read-ahead success for size 1048576