JP Vossen on 10 Dec 2011 10:43:45 -0800

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Re: [PLUG] Lost gigabytes?

Rich, thanks for your comments.

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

The terminology between normal partitions,  LVM,  and ZFS is a bit

POD                       LVM                      ZFS
xxx                     Physical Volume            vDev
Disk                   Volume Group (VG)          Pool
Fixed Partition      Logical Volume (LV)          Folder

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!

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.

JP Vossen, CISSP            |:::======|
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