CDP Quick Tip #3 – How to Balance Backup Compression

Posted by R1Soft on Feb 5, 2010 1:00:00 PM

Here’s a quick tip from the Head GEEK to help you balance backup compression so it doesn’t adversely affect backup time and performance.

R1Soft CDP Enterprise Edition for Windows and Linux uses two techniques to reduce the size of data archived in your recovery points.

1. The R1Soft Virtual Full Backup process only stores unique block-level deltas (changes since your last backup) one time across all of your archived recovery points.

2. Compression can be enabled to reduce the size of the deltas that are stored.

CDP Enterprise Edition uses the zlib software library for compressing deltas in your recovery points.  In addition to the savings that Virtual Full Backups provide, compression that can further reduce the backup data storage by as much as 50% (2:1 compression).  Compression does have a cost.  It slows down the backup and restore transfer rates.  Compression also consumes CPU cycles.  Compression is performed where the CDP Agent is installed before data is transmitted over the network so the CPU usage impacts your production servers.

Here is how to best use compression:
• For fastest backup and restore speeds use “No Compression”

• Compression is best for performing CDP backups over slower Wide-Area-Network links like 10 Mbit Ethernet or T-1s.

• If you do need compression, level 1 is usually best.  In most environments it will typically provide a 50% reduction in storage space.

• Try compression levels higher than 1 only if your production server has plenty of CPU cycles to spare and backup and restore performance is not as important as saving storage space on your CDP Server.

Tip KB article is here: http://wiki.r1soft.com/display/R1D/Disk+Safe+Compression

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Have questions about our High-Performance CDP products? Just email headgeek (at) r1soft (dot) com

Topics: CDP, windows, Backups, linux, R1Soft

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