== sanity test 101b: check stride-io mode read-ahead =========================================================================== 19:02:06 (1788562926)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.829421s, 4.58539MB/s
Read-ahead success for size 8192

2.099630s, 3.99528MB/s
Read-ahead success for size 16384

1.484488s, 5.65084MB/s
Read-ahead success for size 32768

2.104867s, 3.98534MB/s
Read-ahead success for size 65536

1.831097s, 4.58119MB/s
Read-ahead success for size 131072

1.063787s, 7.88561MB/s
Read-ahead success for size 262144

0.816427s, 10.2748MB/s
Read-ahead success for size 524288

1.149238s, 7.29928MB/s
Read-ahead success for size 1048576