Re: How RBD tcp connection works

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how long do you monitor after r/w finish?
there is a configure item named 'ms_connection_idle_timeout' which
default value is 900

fengyd <fengyd81@xxxxxxxxx> 于2019年8月19日周一 下午4:10写道:
>
> Hi,
>
> I have a question about tcp connection.
> In the test environment, openstack uses ceph RBD as backend storage.
> I created a VM and attache a volume/image to the VM.
> I monitored how many fd was used by Qemu process.
> I used the command dd to fill the whole volume/image.
> I found that the FD count was increased, and stable at a fixed value after some time.
>
> I think when reading/writing to volume/image, tcp connection needs to be established which needs FD, then the FD count may increase.
> But after reading/writing, why the FD count doesn't descrease?
>
> Thanks in advance.
> BR.
> Yafeng
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