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From Niklas Edmundsson <ni...@acc.umu.se>
Subject Re: [PATCH] mod_disk_cache working LFS (filecopy)
Date Tue, 26 Sep 2006 10:50:13 GMT
On Tue, 26 Sep 2006, Issac Goldstand wrote:

> Forgive me for missing the obvious, but why not just use mod_file_cache for 
> this? I recall you mentioning that your use of mod_cache was for locally 
> caching very large remote files, so don't see how this would help that in any 
> case since the file doesn't exist locally when being stored, and if the file 
> is otherwise known to be on the file system, there's no reason to keep it in 
> mod_disk_cache's cache area (in any case, it wouldn't improve performance - 
> only mod_file_cache would).  So what am I missing?

Apache Module mod_file_cache
Description:	Caches a static list of files in memory

This has little to do with setup like ours (ftp.acc.umu.se):
* NFS backend with lots of storage (multiple TB), not lots of
   bandwidth/performance.
* Multiple frontends with (relatively) fast cache storage.
* A working set of a couple of hundred GB which changes daily.

By using caching frontends we can easily fill our available 2Gbit even 
though the backend can only do about 300-400Mbit. This is possible 
because of a cache hit rate of about 90%.

/Nikke
-- 
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  Niklas Edmundsson, Admin @ {acc,hpc2n}.umu.se      |     nikke@acc.umu.se
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  One family builds a wall, two families enjoy it.
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