== sanity test 101b: check stride-io mode read-ahead =========================================================================== 08:08:29 (1790942909)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.730314s, 4.84803MB/s
Read-ahead success for size 8192

1.546792s, 5.42323MB/s
Read-ahead success for size 16384

2.034296s, 4.12359MB/s
Read-ahead success for size 32768

1.642832s, 5.10619MB/s
Read-ahead success for size 65536

1.757392s, 4.77333MB/s
Read-ahead success for size 131072

1.443879s, 5.80977MB/s
Read-ahead success for size 262144

1.028130s, 8.15909MB/s
Read-ahead success for size 524288

0.882692s, 9.50344MB/s
Read-ahead success for size 1048576