[kwlug-disc] Disk longevity ...

[Chris Frey]

Thanks Bob!

My specific interest was how you did the upgrade.  Say for example you
had a root LV named /dev/mapper/volumegroup-debian10 and you were upgrading
to debian11.

Would you create a new LV and copy volumegroup-debian10 into it as a backup,
then upgrade in-place to debian11?   Or would you install something
fresh on a brand new LV?

The first I can kinda figure.  The second is a new tactic to me and I
want to understand it. :-)

- Chris


On Wed, Feb 16, 2022 at 01:08:36AM -0500, Bob Jonkman wrote:
> On current OSes the LVM stuff seems to be installed as part of the base
> operating system; I can see LVs with lsblk and I can just mount the LVs as
> either /dev/mapper/volumegroup-lvname or /dev/volumegroup/lvname  For some
> reason I almost always use the /dev/mapper/volumegroup-lvname syntax...
> 
> On older versions of Debian or Ubuntu (2012?) it might be necessary to
> install the lvm2 package. But I've found that the package installation makes
> sure all the needed OS components are in place, and then the LVs are
> available with the above syntax. There' no extra effort for the SysAdmin.
> 
> Older GRUB couldn't boot directly from LVs, but for the last five years or
> so GRUB recognizes LVM, so I no longer create a separate /boot partition
> outside the LVs. The only time I create a separate /boot partition now is
> for encrypted drives.
> 
> --Bob.
> 
> 
> On 2022-02-15 19:04, Chris Frey wrote:
> > On Tue, Feb 15, 2022 at 05:57:49PM -0500, Bob Jonkman wrote:
> > > When I set up new servers I create a few extra LVs each 15 GB in size for
> > > "spare" and "backupOS" which I use for a clean install of a new OS, install
> > > the packages (with dpkg --set-selections), and then point the new fstab to
> > > the old LVs for /home, /srv, /opt, /var/lib/mysql or /var/lib/postgresql,
> > > and /usr/local, and copy the necessary config files from the former root
> > > LV's /etc (yes, salt or ansible would be useful here).
> > 
> > What do you use to get the new LVs started?  Do you run the usual
> > installer and just tell it the new LVs to use?
> > 
> > Thanks,
> > - Chris
> > 
> > 
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> -- 
> Bob Jonkman <bjonkman at sobac.com>          Phone: +1-519-635-9413
> SOBAC Microcomputer Services             http://sobac.com/sobac/
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