RE: block chg tracking

From: John Hallas <>
Date: Thu, 12 Feb 2015 07:58:00 +0000
Message-ID: <>

I find backup with de-duplication technology, like Commvault Simpana, far preferable to incremental backups. And yes, I do work for Commvault Systems.

Why are the 2 not compatible Mladen?

BCT reduces the use of CPU and disk I/O as it knows which blocks have changed. Yes there is an overhead in writing that information and on a massively performant system such as trading system that overhead might be too much, however small it is, however on most systems it is not really noticeable. The benefits when running the backups are a very significant trade-off though And yes, we use Commvault

Wm Morrison Supermarkets Plc is registered in England with number 358949. The registered office of the company is situated at Gain Lane, Bradford, West Yorkshire BD3 7DL. This email and any attachments are intended for the addressee(s) only and may be confidential.

If you are not the intended recipient, please inform the sender by replying to the email that you have received in error and then destroy the email. If you are not the intended recipient, you must not use, disclose, copy or rely on the email or its attachments in any way.

This email does not constitute a contract in writing for the purposes of the Law of Property (Miscellaneous Provisions) Act 1989.

Our Standard Terms and Conditions of Purchase, as may be amended from time to time, apply to any contract that we enter into. The current version of our Standard Terms and Conditions of Purchase is available at:

Although we have taken steps to ensure the email and its attachments are virus-free, we cannot guarantee this or accept any responsibility, and it is the responsibility of recipients to carry out their own virus checks.

i0zX+n{+i^ Received on Thu Feb 12 2015 - 08:58:00 CET

Original text of this message