== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:23:10 (1786353790)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

0.737430s, 11.3755MB/s
Read-ahead success for size 8192

0.715057s, 11.7314MB/s
Read-ahead success for size 16384

0.866686s, 9.67895MB/s
Read-ahead success for size 32768

0.740303s, 11.3313MB/s
Read-ahead success for size 65536

0.592195s, 14.1653MB/s
Read-ahead success for size 131072

0.571121s, 14.688MB/s
Read-ahead success for size 262144

0.548516s, 15.2933MB/s
Read-ahead success for size 524288

0.563891s, 14.8763MB/s
Read-ahead success for size 1048576