[OpenAFS] Re: File creation delays

John W. Sopko Jr. sopko@cs.unc.edu
Thu, 18 Mar 2010 07:51:03 -0400

Jeffrey Altman wrote, On 3/17/2010 3:35 PM:
> On 3/17/2010 3:10 PM, John W. Sopko Jr. wrote:
>> Hmmm, is my Windows 7 desktop, I use an ssh Secure CRT
>> client to ssh from to the various linux servers like
>> I am running the OpenAFS Windows client on my W7
>> desktop and it seems to work fine, copy, create, delete files. So
>> I assumed the firewall was open, I just did
>> "rxdebug 7001 -version" from the file server and
>> it hung. I will look into opening the firewall.
> Which firewall product?  OpenAFS knows how to register itself
> with the built-in Microsoft firewall.  It does not know how to
> detect and register with third-party firewalls.

We are using Only Windows 7 firewall. The problem is that
port 7001 was in the Domain and Public profiles but not
the Private profile. I enabled the Private profile for
port 7001 and that fixed. I need to work with our Windows
group to get our firewall rules straightened out.

Fixing the firewall issue fixed the problem.

>> I would think that this would not matter since I am ssh'ing from
>> my W7 machine to linux clients and they are having the
>> problem.
> If you access a directory from the Windows machine, the Windows
> machine will be issued a callback promise from the file server.
> The file server guarantees that for the next N seconds, if anyone
> else attempts to modify the contents of the directory (or file)
> the file server will contact the Windows machine to notify it that
> the contents of the cache may no longer be valid.
> Callbacks are sent for other operations such as dropping file
> locks, changing ACLs, etc.
> If the file server cannot deliver the promised cache invalidation,
> then it will try for a while before it gives up.  This is the
> mechanism that AFS uses to preserve cache coherency.
>> I just logged into my linux desktop and did a
>> mkdirt and got the delay problem, it is running openafs 1.4.12. From the
>> file server that I am accessing to the client having issues
>> rxdebug shows port 7001 is open:
> Delays will be seen from any system that attempts to perform
> an operation that requires a callback if the callback cannot
> be delivered.
> Jeffrey Altman

John W. Sopko Jr.               University of North Carolina
email: sopko AT cs.unc.edu      Computer Science Dept., CB 3175
Phone: 919-962-1844             Fred Brooks Building; Room 140
Fax:   919-962-1799             Chapel Hill, NC 27599-3175