== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:51:41 (1787565101)
striped dir -i1 -c2 -H all_char  /mnt/lustre/d101b.sanity

1.842326s, 4.55327MB/s
Read-ahead success for size 8192

1.969030s, 4.26027MB/s
Read-ahead success for size 16384

2.097733s, 3.99889MB/s
Read-ahead success for size 32768

1.989789s, 4.21583MB/s
Read-ahead success for size 65536

1.772352s, 4.73304MB/s
Read-ahead success for size 131072

1.669291s, 5.02525MB/s
Read-ahead success for size 262144

1.634804s, 5.13126MB/s
Read-ahead success for size 524288

1.423808s, 5.89167MB/s
Read-ahead success for size 1048576