On 01/06/12 11:30, Wolfgang Denk wrote:
> Hello,
> 
> I know that this is not exactly related to Bacula, but maybe some
> other user has seen similar behaviour.
> 
> I have problems when trying to enable support for jumbo frames on  the
> network.  All NICs and switches are supposed to support that, however
> on some systems the communication of the FD to the SD stops as soon as
> I change on the FD the MTU from the default of 1500 to a higher value
> (9000).  The MTU on the DIR and SD can be set to 9000 without visible
> impact on bacula.
> 
> Funny thing is that this happens not on all systems.
> 
> Does this ring a bell somewhere?
> 
> Thanks in advance.
> 
> Best regards,
> 
> Wolfgang Denk
> 

Hi Wolfgang

I have only seen issues like this when some device along the path is not
properly supporting jumbo frames.

Sometimes a device will require a reboot to make the jumbo frames setting take
affect. I have seen this with DELL switches, for instance.

A quick (non-bacula) way to test is to ssh from one machine to the other and
run a find / command or something that will generate similar amount of output.
 If jumbo frames are not enabled on the whole path, then this output will
appear to "just hang" and you will no longer have connectivity to the system.

It is also possible that some of the NICs in your servers are not properly
supporting the higher MTU that you are setting.

Hope this helps.

-- 
Bill Arlofski
Reverse Polarity, LLC

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