== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:33:00 (1787383980)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.265733s, 6.62747MB/s
Read-ahead success for size 8192

2.031197s, 4.12988MB/s
Read-ahead success for size 16384

2.053342s, 4.08534MB/s
Read-ahead success for size 32768

1.790742s, 4.68443MB/s
Read-ahead success for size 65536

1.579135s, 5.31215MB/s
Read-ahead success for size 131072

1.278866s, 6.55941MB/s
Read-ahead success for size 262144

1.363465s, 6.15242MB/s
Read-ahead success for size 524288

1.062855s, 7.89252MB/s
Read-ahead success for size 1048576