- Community Home
- >
- Storage
- >
- Data Protection and Retention
- >
- StoreEver Tape Storage
- >
- Re: Compression on T9940A FC tape drives
StoreEver Tape Storage
1753720
Members
4939
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
тАО04-11-2002 01:42 AM
тАО04-11-2002 01:42 AM
Compression on T9940A FC tape drives
I am getting no compression when writing to T9940A FC drives from HP Superdomes, whether using 0mnb or 0nb devices. I have already trawled through the forums and knowledge bases, also I've spoken to HP themselves. The only comment I've seen was in a reply to a forum message that implied that not all capabilities of the T9940A drives were supported by HP yet. However I can't find the same message again.
Even a definite response such as "You cannot get compression on these drives from HP servers" would give me "closure" on this problem.
The backup software is Veritas NetBackup DataCenter 3.4 with a Sun master server and a mix of HP and Sun Media Managers. The Sun Media Managers DO get compression. I am convinced it is a driver issue rather than a NetBackup configuration problem.
Thanks.
Nick Clifton
Even a definite response such as "You cannot get compression on these drives from HP servers" would give me "closure" on this problem.
The backup software is Veritas NetBackup DataCenter 3.4 with a Sun master server and a mix of HP and Sun Media Managers. The Sun Media Managers DO get compression. I am convinced it is a driver issue rather than a NetBackup configuration problem.
Thanks.
Nick Clifton
If it's not broke ... doesn't mean it can't be improved!
3 REPLIES 3
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО04-11-2002 04:22 AM
тАО04-11-2002 04:22 AM
Re: Compression on T9940A FC tape drives
What are you using to determine wether you are getting compression or not?
live free or die
harry
live free or die
harry
Live Free or Die
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО04-11-2002 01:00 PM
тАО04-11-2002 01:00 PM
Re: Compression on T9940A FC tape drives
The T9940A drive is not officially supported with the stape driver. Can you configure the drive to work in 9840 emulation mode? The driver actually tries to identify the device's identifiaction to decide what operation is most appropriate. Also, in the mean time you can try creating this device file with the following mksf command:
mksf -d stape -I -u -n -b D9840C
This will create a device file asking the driver to set the drive to the 9840 density with compression on.
To verify this setting, run the following command:
mt -f status
You should see whether compression is set there.
mksf -d stape -I
This will create a device file asking the driver to set the drive to the 9840 density with compression on.
To verify this setting, run the following command:
mt -f
You should see whether compression is set there.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО04-12-2002 01:27 AM
тАО04-12-2002 01:27 AM
Re: Compression on T9940A FC tape drives
Harry,
Sorry for the delay, the God of Documentation is looming over me!
Using the NetBackup available.media script I have checked the sizes of the FULL tapes. Also my colleague, who is a whizz at interpreting the NetBackup logs, was the person that highlighted this problem.
HP tapes vary from 56.39Gb to 56.66Gb
Sun tapes vary from 85.11Gb to 131.42Gb
Hope this is of some help.
Doug,
Thanks for the suggestion, as luck would have it there is a StorageTek engineer on site at present, he is checking the drive settings. It may take some time to test this as I need to get any changes authorised by many people.
Can I just check your suggestion about the mksf, do you mean this may work even if the drive is NOT set to emulate 9840?
Thanks for the help so far.
Sorry for the delay, the God of Documentation is looming over me!
Using the NetBackup available.media script I have checked the sizes of the FULL tapes. Also my colleague, who is a whizz at interpreting the NetBackup logs, was the person that highlighted this problem.
HP tapes vary from 56.39Gb to 56.66Gb
Sun tapes vary from 85.11Gb to 131.42Gb
Hope this is of some help.
Doug,
Thanks for the suggestion, as luck would have it there is a StorageTek engineer on site at present, he is checking the drive settings. It may take some time to test this as I need to get any changes authorised by many people.
Can I just check your suggestion about the mksf, do you mean this may work even if the drive is NOT set to emulate 9840?
Thanks for the help so far.
If it's not broke ... doesn't mean it can't be improved!
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