[OpenAFS] OpenAFS for Windows cache options

[Jeffrey Altman]

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John Perkins wrote:
> Some questions that have come up at our site recently after some review
> of our OpenAFS client setup.  We're running Windows XP with OpenAFS 
> 1.5.52 or 1.5.30-36 clients.
> 
> 1.  Is there a general recommendation for cache size these days?  We had
> been setting the cache size to 1GB if there was what we thought to be 
> enough memory on the host.  Recently that has caused problems on some 
> computers, so we've reduced that to 512MB.  Still, this is much larger 
> than the 98MB default.

You should examine the afsd_service.exe process on the two machines
to determine what DLLs are being loaded on the one machine vs the other
or which is being installed at a conflicting location.  The
SysInternal's Process Explorer is a good tool for this purpose.

> 2.  Is there a recommendation toward using or not using the 
> "NonPersistentCaching" (virtual-memory cache or "normal" file cache)?

Do not use it NonPersistentCaching.  It doesn't provide you more
caching space and limits the ability of your system to page other
applications.

> 3.  Whether or not the NonPersistentCaching option is in use, 
> the following command:
> 	cmdebug -server <hostname> -cache
> returns the following as part of its output:
> 	Cache type:    memory

In both cases a paging file backed memory cache is being used.

> afsd_init.log shows cache type FILE or VIRTUAL as expected; it's just 
> cmdebug that appears to be confused about this.

cmdebug is not confused.  It is a cross platform debugging tool.

Jeffrey Altman


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