[ale] LVM snapshot backups

[Jim Kinney]

Yes. These two forms are backwards of each other. Lvm snapshot starts empty
and fills up. VM snapshot starts full and the continued-use section begins
to fill but it's the new part.
On Jan 23, 2016 3:09 PM, "DJ-Pfulio" <djpfulio at jdpfu.com> wrote:

> Ah ... must have confused LVM snapshots with some other sort, perhaps QCOW2
> snapshots?
> http://wiki.qemu.org/Documentation/CreateSnapshot  Yep. Sorry.  Different
> use-case completely, hence the different results.
>
>
>
> On 01/23/2016 02:09 PM, Jim Kinney wrote:
> > The new data is written to the ORIGINAL lvm. At that point, the old data
> is
> > written to the snapshot lvm.  The snapshot lvm is initially of zero real
> > size, no disk space is used. Only when blocks need to be written to in
> the
> > original lvm are blocks written to in the snapshot. Thus drive space used
> > is double the size of the new data: one write to archive the old data in
> > the snapshot and a second write to store the new data in the original
> lvm.
> > Its a performance hit but an overall time saver. Think of the snapshot as
> > nothing but hard links to physical extents until an extent changes.
> > On Jan 23, 2016 12:42 PM, "DJ-Pfulio" <djpfulio at jdpfu.com> wrote:
> >
> >> Concerning LVM backups.
> >>
> >> If all the change data is being written to the snapshot area, how does
> >> that get
> >> merged back into the main storage and main DB after we are done with
> >> backups?
> >>
> >>
> >>
> >>
> >> On 01/22/2016 02:40 PM, Jim Kinney wrote:
> >>> Slide deck is live on ale.org in meeting announcement page.
> >>> On Fri, 2016-01-22 at 10:54 -0500, DJ-Pfulio wrote:
> >>>> Are there notes, the presentation, and/or video from last night?
> >>>> Sounds like the presentation and some notes could really be helpful
> >>>> based on the
> >>>> comments.
> >>>>
> >>>> Sorry I missed it!
> >> _________________________
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