A beginner project

[Shane Adams]

I've thought about geom snapshots, which I take it you would do at a block layer similarly to how snapshots are implemented in FFS.  I couldnt figure out a way to do it effeciently.  I've found the FFS snapshots do not work well with large disk sets, there is a noticable lag and almost a freeze-up on my computer.  

Seems you'd need to do it at the filesystem layer, and as a side effect change the format of inodes at cylinder groups in order to track changes.

Is there any publish literature on the subject?

Oh - by snapshot I mean something that can be mounted simlultaniously with the original filesystem.

Cheers,
  Shane




----- Original Message ----
From: Eric Anderson <anderson at centtech.com>
To: Soeren Straarup <xride at x12.dk>
Cc: freebsd-geom at freebsd.org
Sent: Sunday, January 21, 2007 10:16:22 PM
Subject: Re: A beginner project

On 01/20/07 01:31, Soeren Straarup wrote:
> What would be a beignner project within geom?
> 
> Something is acutally going to be used by atleat some.
> 
> I have briefly looked at:
> http://www.freebsd.org/projects/ideas/#p-psched
> 
> But are there already someone out there that is working on it?
> 
> /Soeren
> 

Make a 'geom taste' function?

Other ideas:
- geom snapshots (harder!)
- gnop additional options (add latency, etc, to mimic real devices)


Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
An undefined problem has an infinite number of solutions.
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