== sanity test 101b: check stride-io mode read-ahead =========================================================================== 09:31:20 (1790947880)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.606598s, 5.22135MB/s
Read-ahead success for size 8192

2.006074s, 4.1816MB/s
Read-ahead success for size 16384

2.065701s, 4.0609MB/s
Read-ahead success for size 32768

1.925631s, 4.35629MB/s
Read-ahead success for size 65536

1.446155s, 5.80063MB/s
Read-ahead success for size 131072

1.372792s, 6.11062MB/s
Read-ahead success for size 262144

1.418687s, 5.91294MB/s
Read-ahead success for size 524288

1.331737s, 6.299MB/s
Read-ahead success for size 1048576