Re: Garbage Collection Schemes

["Gergely Gábor" <elentirmo.gilgalad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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On Mon, 26 Nov 2007 15:12:10 -0800
John Andersen <jsa-MJZuZBXGww0Jmq/UkTHWNaxOck334EZe@public.gmane.org> wrote:

> I am new to NILFS, so bear with me.
> 
> I would like to ask, (without reading the entire archive of messages) if
> any thought to other garbage collection schemes has been contemplated.
> 
> For instance: This file system looks like it might be very useful for 
> certain types of environments where N sequential revisions of documents
> must be maintained, regardless of the  age or how any given document relates
> to other documents.
> 
> Checkpoints do not seem to do this.
> 
> I would like to see garbage collection options that allow (for example)
> 10 copies retained (of EACH file), each bearing different dates.  
> 
> Garbage collection would erase the 11th (oldest copy) if, (and only if) the 
> other 10 all had different dates.  This prevents the situation where one user 
> (or rogue process) re-saving a document 15 times a day wipes out all prior 
> copies.
> 
> An option might be garbage collection not based on a NUMBER of iterations
> but rather a period of time (3 years, 7 years, etc, while still purging same 
> date (or same hour, minute, etc) copies.
> 

AFAIK there is a protection interval in which GC wont clean up a checkpoint. (maybe i remember badly... and some other LFS fs was that...)

> This type of garbage collection is found almost nowhere, and this
> file system seems to be the closest possible candidate to do this.
> 
> There are applications, where a consistent representation of all 
> files at a specific point in time (snapshot or checkpoint) is LESS
> important than the ability to roll back individual documents to 
> a number of prior iterations or a number of years.
> 
> Legal documents, financial records, code version archiving, etc, all
> have these requirements.
> 
> 
> -- 
> __________________________
> John Andersen	
> Screenio.com
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BTW: does/will nilfs support named snapshots?

Best Regards: Gergely Gábor

-- 
Gergely Gábor <elentirmo.gilgalad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

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