== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:55:36 (1787550936)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.729709s, 4.84972MB/s
Read-ahead success for size 8192

1.174339s, 7.14326MB/s
Read-ahead success for size 16384

2.240176s, 3.74462MB/s
Read-ahead success for size 32768

1.628099s, 5.15239MB/s
Read-ahead success for size 65536

1.247797s, 6.72273MB/s
Read-ahead success for size 131072

1.710661s, 4.90372MB/s
Read-ahead success for size 262144

1.477546s, 5.67739MB/s
Read-ahead success for size 524288

0.992589s, 8.45124MB/s
Read-ahead success for size 1048576