[Samba] CTDB / Samba / GFS2 - Performance - with Picture Link

Vogel, Sven Sven.Vogel at kupper-computer.com
Tue Nov 27 08:50:40 MST 2012

Hi Volker,

thanks for the fast reply. So used the strace command. I am not so a strace specialist but is it possible that the problem are the many polls?`

12513 15:33:24.593065 poll([{fd=9, events=POLLIN|POLLHUP}, {fd=7, events=POLLIN|POLLHUP}, {fd=40, events=POLLIN|POLLHUP}, {fd=32, events=POLLIN|POLLHUP}, {fd=34, events=POLLIN|POLLHUP}], 5, 4436) = 1 ([{fd=32, revents=POLLIN}]) <0.002497>
12513 15:33:24.595615 read(32, "\0\0\0T", 4) = 4 <0.000017>

i added a link to the strace. I dont see which syscalls take long. There are such many syscalls in any second so i dont know whats normal. :-|


Did you have any idea?



-----Ursprüngliche Nachricht-----
Von: Volker Lendecke [mailto:Volker.Lendecke at SerNet.DE] 
Gesendet: Dienstag, 27. November 2012 14:06
An: Vogel, Sven
Cc: samba at lists.samba.org
Betreff: Re: [Samba] CTDB / Samba / GFS2 - Performance - with Picture Link

On Tue, Nov 27, 2012 at 01:00:49PM +0000, Vogel, Sven wrote:
> Hello,
> maybe there is someone they can help and answer a question why i get these network screen on my ctdb clusters. I have two ctdb clusters. One physical and one in a vmware enviroment.
> So when i transfer any files (copy) in a samba share so i get such network curves with performance breaks. I dont see that the transfer will stop but why is that so? can i change anything or does anybody know which ist he problem?
> http://dev.kupper-computer.com/intern/transfer_network.jpg

Do a

strace -ttT -f -o /tmp/smbd.strace -p <smbd-pid>

and see in /tmp/smbd.strace which syscalls take long.


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