== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:31:55 (1790393515)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.067495s, 7.85822MB/s
Read-ahead success for size 8192

1.057244s, 7.93441MB/s
Read-ahead success for size 16384

1.446833s, 5.79791MB/s
Read-ahead success for size 32768

1.161747s, 7.22068MB/s
Read-ahead success for size 65536

0.900821s, 9.31218MB/s
Read-ahead success for size 131072

1.162301s, 7.21724MB/s
Read-ahead success for size 262144

0.930322s, 9.01689MB/s
Read-ahead success for size 524288

0.742098s, 11.3039MB/s
Read-ahead success for size 1048576