Hi Rob,
may I suggest to create a large snapshot (it depends on your scenario what
‚large‘ is, for my setup 10 GB is more than enough) and just watch it for a
while?
> watch lvs
You can run this in a screen session and get back to it every hour or so and
you’ll see how fast your snapshot gets filled up. There’s no risk at this
point, since the snapshot will get inactive even when it reaches 100% of the
assigned space but the originating volume will still be writable.
However, after you have enough usage information you should remove the snapshot
because it slows down the possible write speed to the originating volume.
Hope that helps,
Andreas
> Am 11.02.2015 um 17:56 schrieb Rob Owens <rowens AT ptd DOT net>:
>
> I am trying to set up LVM snapshots and I need to figure out how large of a
> space to allocate for the snapshot. Is there a tool I can use to monitor the
> changes to my filesystem over some period of time? In other words, I want to
> know how much changed data there is over a day, a week, etc.
>
> This would be helpful not only for calculating LVM snapshot space, but also
> storage pool space.
>
> Thanks for any advice you can provide.
>
> -Rob
>
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Dive into the World of Parallel Programming. The Go Parallel Website,
sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net/
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