- Community Home
- >
- Storage
- >
- Data Protection and Retention
- >
- StoreEver Tape Storage
- >
- Compression on Surestore DLT 40
StoreEver Tape Storage
1753713
Members
4812
Online
108799
Solutions
Forums
Categories
Company
Local Language
юдл
back
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Forums
Discussions
юдл
back
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Blogs
Information
Community
Resources
Community Language
Language
Forums
Blogs
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО01-04-2002 01:33 PM
тАО01-04-2002 01:33 PM
Compression on Surestore DLT 40
I am unable to achieve more than 26.9 GB of data on one tape. I have loaded the newest driver and firmware, but my backups still stop around 26 GB. This particular drive is backing up several Novell servers and 2 databases. There are compressed files on the Novell servers.
I have my backup software configured to use hardware compression, but I have yet to see a backup over 30 GB. Is this normal? If not, what else is left to do?
I have my backup software configured to use hardware compression, but I have yet to see a backup over 30 GB. Is this normal? If not, what else is left to do?
3 REPLIES 3
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО01-05-2002 09:23 AM
тАО01-05-2002 09:23 AM
Re: Compression on Surestore DLT 40
How much compression you acheive depends on the data you are compressing. An average is 2 - 1, YMMV. There are some good treatises in these forums on the subject, suggest you conduct a search.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО01-09-2002 01:14 PM
тАО01-09-2002 01:14 PM
Re: Compression on Surestore DLT 40
Hello Robin,
There are a couple of reasosn why you may not be getting the storage capacity as advertised.
- Nature of you data: if you data is already compressed (zip/mp3/cab/etc) the drive will have a hard time compressing this data again. The amount of data stored on tape will be more than the amount of data you are storing. Try a test backup with hardware compression disabled and see how much data now fits on a tape.
- Performance: slow performing systems may cause a bit of capacity loss on tape. Make sure the drive runs at about 3 MB/sec native speed (without HW compression) by tweaking the backup software.
- Dirty drive and/or worn media: In this case the drive may have problems writing data to tape and possibly relocate data blocks on tape which will cause capacity loss. Clean the drive and test with a new tape and see if this helps.
There are more possbillities of course, but the above 3 steps are the most common ones.
br,
Cal.
There are a couple of reasosn why you may not be getting the storage capacity as advertised.
- Nature of you data: if you data is already compressed (zip/mp3/cab/etc) the drive will have a hard time compressing this data again. The amount of data stored on tape will be more than the amount of data you are storing. Try a test backup with hardware compression disabled and see how much data now fits on a tape.
- Performance: slow performing systems may cause a bit of capacity loss on tape. Make sure the drive runs at about 3 MB/sec native speed (without HW compression) by tweaking the backup software.
- Dirty drive and/or worn media: In this case the drive may have problems writing data to tape and possibly relocate data blocks on tape which will cause capacity loss. Clean the drive and test with a new tape and see if this helps.
There are more possbillities of course, but the above 3 steps are the most common ones.
br,
Cal.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО01-09-2002 01:42 PM
тАО01-09-2002 01:42 PM
Re: Compression on Surestore DLT 40
Robin,
Paul hit it on the head. A DLT 40 means you can store 20 GB of data, 40GB if it compresses normally. Which, unfortunately doesn't happen if the data is compressed already, and it can actually cause the storage requirements to be more. If you had a report file in ascii text, you'd probably get away with more than 40 GB on the DLT 40 (with at least 70% compression).
live free or die
harry
Paul hit it on the head. A DLT 40 means you can store 20 GB of data, 40GB if it compresses normally. Which, unfortunately doesn't happen if the data is compressed already, and it can actually cause the storage requirements to be more. If you had a report file in ascii text, you'd probably get away with more than 40 GB on the DLT 40 (with at least 70% compression).
live free or die
harry
Live Free or Die
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
News and Events
Support
© Copyright 2024 Hewlett Packard Enterprise Development LP