Skepticism about deduplication to tape remains

Deduplication to tape hasn’t seemed to catch on. Why?

Requires Free Membership to View

I have pretty strong opinions on deduplication products, but the basic theory of its use with a disk-based virtual tape library (VTL) is basically sound. Rather than storing seven full backups, you apply de-duplication so you only use disk to store the first full copy and change data. That uses less space.

The real issue with dedupe in the companies I visit is that it has never been tested in court. If you are publicly traded, the SEC requires that your financial data be disclosed in a full and unaltered form. Dedupe has never been subjected to scrutiny by the SEC or by the courts to decide whether it materially alters data. To many of my clients (especially those in financial services), it doesn’t matter if dedupe changes data or not. They don’t want to shoulder the burden of the court costs that would accrue to fighting a battle over the admissibility of their data if it is ever called into question.

Deduplication to tape (like encryption) introduces another hurdle I need to jump when I am trying to restore my applications under tight timeframes. I just don’t like the extra step and the issues, depending on the kind of dedupe you use, having to do with having the index or other structures required to “rehydrate” deduplicated data.

This was first published in March 2012

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: