Re: Can NetBSD cgd be used for encrypted backup?

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Mon, Jun 12, 2017 at 02:55:48PM +0200, Kamil Rytarowski wrote:
> On 12.06.2017 14:45, Thor Lancelot Simon wrote:
> > On Sun, Jun 11, 2017 at 06:41:56PM +0200, Kamil Rytarowski wrote:
> >>
> >> You would need to push large part image of an encrypted volume for every
> >> change to files.
> > 
> > That doesn't make sense to me.  Why would you need to push more blocks
> > than actually changed?
> > 
> 
> Cloud hosting would require partial updates of files. But I think we can
> agree that using cgd raw image is not the best tool for this task.

I still don't understand what you're getting at.  Are you suggesting backing
the image with S3 or something?  If so, I don't actually see why the write
amplification problem is any worse for block-based or file-based storage,
though it's bad for a small-write workload either way.

-- 
  Thor Lancelot Simon	                                     tls%panix.com@localhost

  "We cannot usually in social life pursue a single value or a single moral
   aim, untroubled by the need to compromise with others."      - H.L.A. Hart