Compression confusion


Compression confusion
Craig Konas

There are two types of compression available for your backups - hardware and software. The hardware compression is usually enabled and disabled by either a DIPswitch or jumper on the tape drive. Please consult the tape drive manual to verify this. The software compression is enabled and disabled through the backup options within the software. It is recommended that you disable the software compression option if the tape device supports hardware compression. Hardware compression is far superior in speed and compression than the software counterpart.

It is not recommended to enable both hardware and software compression. This will cause the size of the data set written to the tape to increase in size; usually taking more space than the original data. The reason for this is because the software first compresses the data, adding header information for the software compression, and then the tape drive tries to compress the data. Unable to compress the information further, the tape drive still writes header information to the data set, thereby increasing the file size written to the tape cartridge.

About the author: Craig Konas is a senior member of NovaStor Corporation's Technical Support group. Craig has assisted thousands of customers with backup and disaster recovery during each of his 5 years with NovaStor. NovaStor technical

Requires Free Membership to View

support is a free service to customers.

This was first published in January 2002

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:

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.