== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:09:07 (1788750547)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.793016s, 4.67849MB/s
Read-ahead success for size 8192

1.746916s, 4.80195MB/s
Read-ahead success for size 16384

1.509565s, 5.55697MB/s
Read-ahead success for size 32768

1.987308s, 4.22109MB/s
Read-ahead success for size 65536

1.194121s, 7.02492MB/s
Read-ahead success for size 131072

1.620107s, 5.17781MB/s
Read-ahead success for size 262144

1.534173s, 5.46784MB/s
Read-ahead success for size 524288

1.464324s, 5.72866MB/s
Read-ahead success for size 1048576