[Veritas-bu] RE: [Veritas-vx] Help with Veritas products?
2001-07-09 14:00:43
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
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