[Samba] howto optimize samba/kerberos for 20k requests per minute - help needed

Stefan Bauer stefan.bauer at cubewerk.de
Tue Jul 20 05:56:49 UTC 2021


it is kopano. They state on their website¹:



Please note that due to performance problems in Samba 4, Samba 4 is not 
supported as a user source for setups larger than 50 users.


And that is indeed what i notice. The high amount of kerberos-requests 
between samba-DC and kopano server is causing a very high io-load on the 
samba system - renders the system unstable. Also the time an 
authentication request takes, is between 200-400ms.

As Kopano is doing an authentication every time a user clicks a single 
mail and no caching is possible, it is hitting the samba system too hard.



On 19.07.21 11:27, Rowland Penny via samba wrote:
> On Mon, 2021-07-19 at 11:13 +0200, Stefan Bauer via samba wrote:
>> Hi and thank you for your time.
>> We got now the confirmation that samba 4 is not supported by our
>> software-vendor.
> If I might ask, who is your software vendor and what is the software ?
> In most cases, when a supplier says they do not support Samba 4, they
> do support AD.

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