Correct. I didn't mean to imply what I erroneously implied!
I can share another tidbit/caveat with de-dup that we recently learned:
Exchange online defragmentation severely hurt de-duplication in our
environment. For some reason, we do it nightly here; our Exchange group
believes that it helps with performance (although I have other ideas).
What happens each night, is that white-space is re-arranged on the disk,
which in turn, changes the nature of the data that is backed up.
Curtis Preston wrote:
That is not a DD-specific thing, that's a de-dupe thing. You can't
dedupe encrypted data. As to whether it can dedupe digital imagery,
it will if you're backing up multiple copies of the same image (e.g.
repeated fulls of a directory with images in it), but if you're
constantly storing new data (e.g. seismic data, telemetry data) and
only backing up the new data, it won't dedupe. (This is also true of
any dedupe solution.)
---
W. Curtis Preston
Backup Blog @ www.backupcentral.com <http://www.backupcentral.com>
VP Data Protection, GlassHouse Technologies
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] *On Behalf Of
*Steven L. Sesar
*Sent:* Friday, January 04, 2008 7:30 AM
*To:* Ed Wilts
*Cc:* veritas-bu@mailman.eng.auburn.edu
*Subject:* Re: [Veritas-bu] Backup Strategy
Oh, absolutely! If you store digital imagery, for instance, DD becomes
very, very expensive! Encrypted data is another example.
Ed Wilts wrote:
On 1/4/08, *Steven L. Sesar* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
I second Data Domain as a disk target for backups!
We evaluated them here and they don't work with a darn in our
environment. For small parts of our environment (replicating remote
sites back here), a PureDisk solution is working well but for our main
data store, the DD stuff doesn't justify itself.
DataDomain is a good tool, but not necessarily the right tool for
every job.
.../Ed
--
Ed Wilts, Mounds View, MN, USA
mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
------------------------------------------------------------------------
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--
===================================
Steven L. Sesar
Lead Operating Systems Programmer/Analyst
UNIX Application Services R101
The MITRE Corporation
202 Burlington Road - MS K101
Bedford, MA 01730
tel: (781) 271-7702
fax: (781) 271-2600
mobile: (617) 519-8933
email: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
===================================
--
===================================
Steven L. Sesar
Lead Operating Systems Programmer/Analyst
UNIX Application Services R101
The MITRE Corporation
202 Burlington Road - MS K101
Bedford, MA 01730
tel: (781) 271-7702
fax: (781) 271-2600
mobile: (617) 519-8933
email: [EMAIL PROTECTED]
===================================
_______________________________________________
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