== sanity test 101b: check stride-io mode read-ahead =========================================================================== 16:57:25 (1781211445)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.767533s, 4.74594MB/s
Read-ahead success for size 8192

2.101617s, 3.9915MB/s
Read-ahead success for size 16384

1.650343s, 5.08295MB/s
Read-ahead success for size 32768

1.845036s, 4.54658MB/s
Read-ahead success for size 65536

1.968220s, 4.26203MB/s
Read-ahead success for size 131072

1.099775s, 7.62757MB/s
Read-ahead success for size 262144

1.541681s, 5.44121MB/s
Read-ahead success for size 524288

1.608688s, 5.21456MB/s
Read-ahead success for size 1048576