== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:30:32 (1711092632)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

7.714412s, 1.08739MB/s
Read-ahead success for size 8192

6.959314s, 1.20538MB/s
Read-ahead success for size 16384

7.510909s, 1.11686MB/s
Read-ahead success for size 32768

7.582762s, 1.10627MB/s
Read-ahead success for size 65536

7.482922s, 1.12103MB/s
Read-ahead success for size 131072

7.277620s, 1.15266MB/s
Read-ahead success for size 262144

7.325653s, 1.1451MB/s
Read-ahead success for size 524288

6.546223s, 1.28144MB/s
Read-ahead success for size 1048576