== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:18:58 (1783563538)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

0.793115s, 10.5768MB/s
Read-ahead success for size 8192

0.834788s, 10.0488MB/s
Read-ahead success for size 16384

0.889123s, 9.4347MB/s
Read-ahead success for size 32768

0.666545s, 12.5852MB/s
Read-ahead success for size 65536

0.574450s, 14.6029MB/s
Read-ahead success for size 131072

0.528292s, 15.8787MB/s
Read-ahead success for size 262144

0.500271s, 16.7681MB/s
Read-ahead success for size 524288

0.504486s, 16.628MB/s
Read-ahead success for size 1048576