Comment # 3 on bug 1043040 from zhen ren

Hi Hannes,

(In reply to zhen ren from comment #2)
> Upstream doesn't have this issue. Seems we do some auto optimization to the
> "read ahead" value:
> 
> # blockdev --setra 678 /dev/loop0
> # blockdev --getra /dev/loop0 
> 672
> # lvcreate -n testlv -L4m testvg /dev/loop0
> # blockdev --getra /dev/testvg/testlv
> 1024
> 
> # blockdev --setra 4096 /dev/loop0
> # blockdev --getra /dev/loop0 
> 4096
> # lvcreate -n testlv -L4m testvg /dev/loop0
> 	Logical volume "testlv" created.
> # blockdev --getra /dev/testvg/testlv
> 4096

Just want to confirm with you that this "read-ahead" behavior on our product is
expected, right? If so, I will fix on the testcase side.

Thanks.