[OpenAFS] Re: File creation delays

[Jeffrey Altman]

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On 3/17/2010 3:10 PM, John W. Sopko Jr. wrote:
> Hmmm, 152.2.140.115 is my Windows 7 desktop, I use an ssh Secure CRT
> client to ssh from 152.2.140.115 to the various linux servers like
> 152.2.140.200. 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 152.2.140.115 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.

> I would think that this would not matter since I am ssh'ing from
> my 152.2.140.115 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 152.2.140.200 and did a
> mkdirt and got the delay problem, it is running openafs 1.4.12. From th=
e
> 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


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