[OpenAFS] no cache size in cacheinfo, 100% of space

[Paul Blackburn]

Joerg Sommer wrote:

>Hi,
>
>how can I say afsd that it should use the whole partition? And can afsd
>determine itself the partition size?
>
>Joerg.
>_______________________________________________
>OpenAFS-info mailing list
>OpenAFS-info@openafs.org
>https://lists.openafs.org/mailman/listinfo/openafs-info
>  
>
afsd is not able to use 100% of the disk cache partition.

There is some explanation in the Transarc AFS documentation here:
http://www.transarc.ibm.com/Library/documentation/afs/3.6/unix/en_US/HTML/QkBegin/auqbg007.htm#HDRWQ146


If you look at the disk cache (eg /usr/vice/cache in Transarc AFS) just
after you install and start the AFS Cache Manager and before you start
accessing files in /afs, you will find lots of files used by the Cache 
Manager.

The "rule of thumb" for computing the cache size from the disk cache
local filesystem size (eg /usr/vice/cache) is 80% for AIX.

I wrote some scripts to automate installation of AFS on AIX
( http://www.angelfire.com/hi/plutonic/afs_install.html ).

This ksh snippet from afs_install's mk-afs-cli script shows the calculation:

> # Compute a value for the cache size to save in /usr/vice/etc/cacheinfo
> # For AIX 3.2 the size should be 80% of the filesystem size.
> #
> # In /usr/vice/cacheinfo, the cachesize is expressed in kilobytes.
> # From qhost, afscache_sizeMB is in MB, there are 1024 KB in a MB:
>
> let cachesize=\(\(${afscache_sizeMB}\*1024\)\*80\)/100
>
> doit "echo /afs:${afscachename}:${cachesize} >/usr/vice/etc/cacheinfo"

--
cheers
paul                        http://acm.org/~mp