[OpenIndiana-discuss] Updates in OI

[Judah Richardson]

On Tue, May 4, 2021 at 8:51 AM Toomas Soome via openindiana-discuss <
openindiana-discuss at openindiana.org> wrote:

>
> > On 4. May 2021, at 16:27, Dave Miner <dave.miner at oracle.com> wrote:
> >
> > 
> >
> > On 5/4/2021 8:59 AM, Yassine Chaouche wrote:
> > > Le 5/4/21 à 1:43 PM, Stephan Althaus a écrit :
> > >>
> > >> Hello!
> > >>
> > >> We have "Boot environments"
> > >>
> > >> On every "pkg update" you get a new BE that will be used on next
> reboot.
> > >
> > > This is just
> > >
> > ...
> > > Is this done by issuing a ZFS snapshot of the whole root partition ? or
> > > is it more granular ?
> > >
> > > If this is done via snapshots, this means writing to an evergrowing
> file
> > > on disk until the snapshot is removed. So the longer you keep a
> snapshot,
> > > the bigger the file gets.
> > >
> >
> > Yes, boot environments in the OpenSolaris-derived OS's are implemented
> using ZFS snapshots/clones of the root datasets.  Combined with IPS's
> optimizations to only update objects that have changed between package
> versions, you may find that boot environments for an update may not be
> nearly as large as the initial installation; it all depends on how much has
> changed.  Reclaiming space is as simple as deleting older boot environments
> when they're no longer needed.  It's not at all unusual for a system to
> have a dozen or more boot environments; some of the more masochistic among
> us used to have systems with 100 or more.
> >
> > Dave
> >
>
> With old grub, the number is limited to 50 - 60 becsuse of memory setup.
> With loader, I did demo with 600, but since loader is using sliding window,
> the number of BE’s is not limited there.
>
Is there ever a situation in which the disk can run out of space due to too
many BEs? And if so, how does one go about automatically pruning
old/unwanted BEs?

>
> Rgds,
> Toomas
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