Also, snapshots are a full atomic copy operation while checkpoints return 
almost instantly and have a copy-on-write behavior thereafter. The result at 
least appears to be instantaneous.

--Buddy

-----Original Message-----
From: Roger B.A. Klorese [mailto:rogerk AT QueerNet DOT ORG]
Sent: Tuesday, July 03, 2001 5:26 PM
To: James Mello
Cc: Lumpkin, Buddy; veritas-vx AT mailman.eng.auburn DOT edu;
veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] RE: [Veritas-vx] Help with Veritas products?


On Tue, 3 Jul 2001, James Mello wrote:
> So how is this different that snapshots? Why do you have to license it
> seperately if you could do this with VxFS natively? Is there something
> obvious that I'm missing?

Snapshots require a separate container for storage; checkpoints live in
the same device as the parent.

Snapshots are read-only; checkpoints can be read-only or read-write.

Snapshots are transient; checkpoints are persistent.

Snapshots are disposed of at unmount; checkpoints can be committed or
rolled back to, so any of the branches can be the new "main" data.

Snapshots are one-level -- though more than one can be in effect at a
time, all are based on a single parent for the file system; checkpoints
can have other checkpoints as parents.
-- 
ROGER B.A. KLORESE                                          rogerk AT QueerNet 
DOT ORG
PO Box 14309                                            San Francisco, CA 94114
"Go without hate. But not without rage. Heal the world."        -- Paul Monette