[OpenAFS] Tips for usin on LAN

Jeffrey Altman jaltman@secure-endpoints.com
Sun, 02 Aug 2009 07:39:03 -0400

Please read the release notes for the Windows client
and tune it for your environment using the options
described in Appendix A.  The default cache is 96MB.
That is much to small for most Windows working sets.

The Windows client defaults to requiring encryption
for all communications.  Encrypted sessions have a
significant impact on the overall throughput.

The Windows client feeds its data to the Windows
file system through the Microsoft SMB Redirector
driver.  There have been bugs in the SMB Redirector
that negatively impact OpenAFS.  Hot fixes for
XP and 2003 have been issued and are linked from
the www.openafs.org/windows.html page.  The same
fixes have been incorporated into Vista/2008 SP2
and Windows 7.

The file server parameters must be tuned.  The
default values are insufficient for more than a
handful of client machines.  I refer you to the
slides from the live troubleshooting session of
the 2009 AFS / Kerberos Best Practices Workshop.


The following is an reasonable starting configuration for 200 clients.

/usr/afs/bin/fileserver -L -udpsize 131071 -sendsize 131071
   -rxpck 700 -b 600 -cb 3000000

Finally, the 1.4.7 OpenAFS servers are old.  The
current version is 1.4.11.  There have been many
improvements between those two versions.

Jeffrey Altman

admin@tbb.sk wrote:
> Windows client is 1-5-60, kfw 3-2-2.
> Debian server Lenny OpenAFS 1.4.7 built 2009-04-07.
> I have installed only basic system Kerberos5b and OpenAFS.
> Between server and client is not any firewall. On windows machine is
> only windows firewall, antivirus NOD32 and Spybot search and destroy.
> It seems that vesrsion AFS is old. I try update.
> Thanks
> Roman Valuch
> *Jason Edgecombe <jason@rampaginggeek.com>*
> Odeslal: openafs-info-admin@openafs.org
> 01.08.2009 23:27
> Komu
> 	admin@tbb.sk
> Kopie
> 	openafs-info@openafs.org
> Předmět
> 	Re: [OpenAFS] Tips for usin on LAN
> admin@tbb.sk wrote:
>> Hallo,
>>  I try using OpenAFS on LAN as fileserver. I want ask for any tips. We
>> have at about 200 Windows and Mac clients  and 1TB data.
>> I have two problems.
>> The first problem is speed on LAN. It is 5x slower as Novell Netware 6.5
>> or 4.12.
>> The seccond problem is cache call back. How to set properties of files
>> (for example XLS, Doc files ) when files modifying multiple users.
>> It is possible  lock file on the server when the first user open file
> with
>> RW  permissions ?
>> Is AFS + Object storage solution for me ? Does anybody know any good
> guide
>> for object storage or docu ? I have read AFS+ Object storage
>> from  Hartmut Reuter.
> Hi Roman,
> 5x slower than Novell sounds wrong. Are there any firewalls between the
> fileserver and clients? Are there any firewalls on the clients or servers?
> What versions of openafs are you running on the clients and server?
> Locking should work for MS Office documents on windows clients with
> recent OpenAFS clients and servers.
> Object storage is an advanced AFS topic. I recommend getting a normal
> OpenAFS cell working well and getting some experience before adding
> object storage to the mix.
> Jason
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