== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:38:03 (1781239083)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.529384s, 5.48496MB/s
Read-ahead success for size 8192

1.474394s, 5.68953MB/s
Read-ahead success for size 16384

1.310613s, 6.40052MB/s
Read-ahead success for size 32768

1.495571s, 5.60897MB/s
Read-ahead success for size 65536

1.602413s, 5.23498MB/s
Read-ahead success for size 131072

1.723176s, 4.86811MB/s
Read-ahead success for size 262144

1.398307s, 5.99912MB/s
Read-ahead success for size 524288

1.288057s, 6.51261MB/s
Read-ahead success for size 1048576