== sanity test 101b: check stride-io mode read-ahead =========================================================================== 17:49:24 (1788644964)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

2.129495s, 3.93925MB/s
Read-ahead success for size 8192

1.893406s, 4.43043MB/s
Read-ahead success for size 16384

2.163737s, 3.87691MB/s
Read-ahead success for size 32768

1.746760s, 4.80238MB/s
Read-ahead success for size 65536

1.844130s, 4.54882MB/s
Read-ahead success for size 131072

1.368465s, 6.12994MB/s
Read-ahead success for size 262144

1.165566s, 7.19703MB/s
Read-ahead success for size 524288

1.333036s, 6.29286MB/s
Read-ahead success for size 1048576