Re: [PLUG] Lost gigabytes?

[JP Vossen <jp@jpsdomain.org>]

Rich, thanks for your comments.


> Date: Sat, 10 Dec 2011 03:30:43 -0000 (GMT)
> From: "Lee H. Marzke"<lee@marzke.net>

<snip>
> The terminology between normal partitions,  LVM,  and ZFS is a bit
> confusing.
>
> POD                       LVM                      ZFS
> xxx                     Physical Volume            vDev
> Disk                   Volume Group (VG)          Pool
> Fixed Partition      Logical Volume (LV)          Folder
<snip>

Wow.  I was vaguely aware of all of the above, but I couldn't have laid 
it out like this.  And I didn't know of the rest of the details.

Great stuff, thanks Lee!


<snip>
> The other issue with LVM is that you can't revert to the snapshot.
> So you can only use LVM for helping with freezing data for a backup
> and not preserving the system to back out a bad patch.

Yes.  I always forget to clarify this point because I learned it this 
way, so reverting to a snapshot was never an option, so I forget to 
point that out.  But as Lee always reminds me, lots of people expect to 
be able to revert to a snapshot, and that fact that you can't on LVM is 
important to know.

Later,
JP
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