[systemd-devel] 'Offline System Updates' examination

[Tomasz Torcz]

On Thu, Jun 21, 2012 at 12:45:02PM +0200, Lennart Poettering wrote:
> On Thu, 21.06.12 12:31, Antonio Trande (anto.trande at gmail.com) wrote:
> 
> > > > BTRFS ? Will 'Offline Updates' be available only with BTRFS ?
> > >
> > > Nope. But on btrfs we'll make a snapshot of the old system state. On
> > > non-btrfs we won't.
> > >
> > 
> > Maybe BTRFS will be the default filesystem in Fedora 18, therefore all that
> > make sense.
> > If i use EXT4, are snapshots (that are a guarantee if update fails) not
> > available ? This automation of updates could be difficulty manageable.
> 
> Snapshots only make sense really on CoW filesystems such as btrfs, and
> they are not supported on ext4. That means the extra safety net that is
> a snapshot will only be available on btrfs, and not on ext4, but the
> snapshot is really just the cherry on top, not a must-have.

  yum-plugin-fs-snapshot has logic to do snapshots both on btrfs and on
LVM level.  btrfs is a better option, though.

-- 
Tomasz Torcz            There exists no separation between gods and men:
xmpp: zdzichubg at chrome.pl   one blends softly casual into the other.