[OpenAFS] Maximum partition size limitation

[Hartmut Reuter]

Horst Birthelmer wrote:

>> A volume has a file size limit of X in OpenAFS 1.3 (2GB in 1.2), and a 
>> volume size limit of Y.  But also remember the AFS volumes are stored 
>> within a filesystem on the file server and that has its own limits 
>> depending on the version of the OS you're running.
>>
>> So what are the theoretical and known working values of X and Y?
>>
> 
> X would be the biggest 64 Bits number on Linux and AIX (AFAIK) 2GB on 
> the rest of them.
> Y can be anything up to your partition size as long as you didn't set 
> volume quotas. ;-)
> partition size is limited by your OS.

The number of blocks is stored in a afs_int32 in the volume-header. This 
gives a
limitation of  ~2 TB per volume in OpenAFS. In MR-AFS I was already forced
to change the field to afs_uint32 gaining another 2 TB. Here the largest 
volume
has 2951431739 blocks which, of course, are not resident on disk.

Hartmut

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Hartmut Reuter                           e-mail reuter@rzg.mpg.de
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Computing Center of the Max-Planck-Gesellschaft (MPG) and the
Institut fuer Plasmaphysik (IPP)
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