|
Re: [Veritas-bu] NBU7 / De-Dupe?
2010-04-02 10:56:41
Nice thing about DDs are they can give you
a daily email with that kind of detail.
From:
veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Mike Andres
Sent: Friday, April 02, 2010 10:49
AM
To: Ed Wilts; David Stanaway
Cc:
veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] NBU7 /
De-Dupe?
Another thing to note
as with many of these types of devices (VTL’s, intelligent disk, dedup
applications, etc.) using OS specific tools such as df to determine used space
will not give accurate numbers. You’ll want to measure used space
from the tools provided in the application or device. There are many
things to consider such as expired images that have not been cleaned up,
housekeeping and garbage collection processes that return occupied blocks to
the free pool, etc. The base OS is never aware of these types of
things.
From:
veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Ed Wilts
Sent: Friday, April 02, 2010 9:41
AM
To: David Stanaway
Cc:
veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] NBU7 /
De-Dupe?
On Fri, Apr 2, 2010 at 8:29 AM, David Stanaway <david AT stanaway DOT net> wrote:
These number aren't that hot compared to DataDomain from my use of it.
We are seeing 86TB of backup images occupying 4.4TB of phys disk.
It all depends on the data streams and how many generations you keep. If
you keep a year's worth of weekly full copies of the same data, you're going to
have 52:1 de-dupe. If you need to only keep 1 copy and the data doesn't
have duplicate blocks (e.g. TIFF images), you're going to have no de-dupe at
all.
This is all VERY customer-specific. The only way to know if a de-dupe
appliance (or the software) is worth the price is to evaluate it. You may
even find, like we did, that it's suitable and justifiable for some of your
data but not others.
.../Ed
Proud partner. Susan G. Komen for the Cure.
Please consider our environment before printing this e-mail or attachments.
----------------------------------
CONFIDENTIALITY NOTICE: This e-mail may contain privileged or confidential information and is for the sole use of the intended recipient(s). If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
----------------------------------
|
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
|
|
|
