== sanity test 101b: check stride-io mode read-ahead =========================================================================== 08:27:07 (1789129627)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.493402s, 5.61711MB/s
Read-ahead success for size 8192

1.661560s, 5.04863MB/s
Read-ahead success for size 16384

1.768823s, 4.74248MB/s
Read-ahead success for size 32768

1.890040s, 4.43832MB/s
Read-ahead success for size 65536

1.467044s, 5.71803MB/s
Read-ahead success for size 131072

1.282854s, 6.53902MB/s
Read-ahead success for size 262144

1.022416s, 8.20469MB/s
Read-ahead success for size 524288

1.137775s, 7.37282MB/s
Read-ahead success for size 1048576