== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:00:57 (1762491657)
striped dir -i1 -c2 -H crush /mnt/lustre/d101b.sanity

1.822829s, 4.60197MB/s
Read-ahead success for size 8192

1.723262s, 4.86787MB/s
Read-ahead success for size 16384

1.622105s, 5.17143MB/s
Read-ahead success for size 32768

1.707225s, 4.91359MB/s
Read-ahead success for size 65536

1.073925s, 7.81117MB/s
Read-ahead success for size 131072

1.342141s, 6.25017MB/s
Read-ahead success for size 262144

1.085793s, 7.72579MB/s
Read-ahead success for size 524288

1.278442s, 6.56159MB/s
Read-ahead success for size 1048576