Re: How RBD tcp connection works

[fengyd <fengyd81@xxxxxxxxx>]

I collected the lsof at different time and found that: 

The total number of open FD is stable at a fixed value, and some of tcp connection are changed.

On Mon, 19 Aug 2019 at 16:42, fengyd <fengyd81@xxxxxxxxx> wrote:

-how long do you monitor after r/w finish? 

More than 900 seconds.

I executed the following command last Saturday and today, the output was same.

sudo lsof -p 5509 | wc -l

And the result from /proc:

ls -ltr /proc/5509/fd | grep socket | grep "Aug 13" | wc -l
134

 sudo ls -ltr /proc/5509/fd | grep socket | grep "Aug 19" | wc -l
0

In which configuration file can I find ms_connection_idle_timeout? 

On Mon, 19 Aug 2019 at 16:26, huang jun <hjwsm1989@xxxxxxxxx> wrote:

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
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

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