== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:32:06 (1789187526)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

0.979672s, 8.56267MB/s
Read-ahead success for size 8192

0.974369s, 8.60927MB/s
Read-ahead success for size 16384

1.146916s, 7.31406MB/s
Read-ahead success for size 32768

0.962212s, 8.71805MB/s
Read-ahead success for size 65536

0.722100s, 11.617MB/s
Read-ahead success for size 131072

0.694619s, 12.0766MB/s
Read-ahead success for size 262144

0.636838s, 13.1723MB/s
Read-ahead success for size 524288

0.686129s, 12.226MB/s
Read-ahead success for size 1048576