- Community Home
- >
- Storage
- >
- Data Protection and Retention
- >
- StoreEver Tape Storage
- >
- Re: Can a DDS1 tape written in a DDS2 tape drive r...
Categories
Company
Local Language
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
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
Community
Resources
Forums
Blogs
- 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
тАО08-31-2004 07:48 AM
тАО08-31-2004 07:48 AM
Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
If not, how can I make it so?
Thanks!
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 08:03 AM
тАО08-31-2004 08:03 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
You can not read a tape written in DDS2 drive in DDS1 drive.
That said, if you write a DDS1 tape in DDS2 drive in DDS1 format, you can read in DDS1 and DDS2 drives.
How do you prepare a DDS1 special file??
man mksf
mksf -d tape -H "hardware_address" -b DDS1 /dev/rmt/DDS1
lssf /dev/rmt/DDS1 -- > to check it.
Now for writing a tape on DDS@ drive with DDS1 format use this device
tar -cvf /dev/rmt/DDS1 /tmp/your_file
Anil
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 08:17 AM
тАО08-31-2004 08:17 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
Think downward compatibility. DDS4 will write/read DDS3, DDS3 write/read DDS2, etc...
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 08:18 AM
тАО08-31-2004 08:18 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
Thanks for your answer. What happens when you use DDS1 tape using default device file /dev/rmt/0mn using a DDS2 Tape drive? Can DDS1 Tape drive read this?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 08:18 AM
тАО08-31-2004 08:18 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
Hope this helps.
Regds
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 08:21 AM
тАО08-31-2004 08:21 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
(DDS2 tape drive) This is best density DDS2 drive speical file. So you cant read this tape in DDS1 drive.
Anil
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 08:29 AM
тАО08-31-2004 08:29 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 08:32 AM
тАО08-31-2004 08:32 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
SAM --> Peripheral Devices --> Tape Drives
Select the device
Actions --> Create Device Files --> Create Custom Device File...
Select [Density] --> DDS1
This will create a file /dev/rmt/c#t#d#DDS1C
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 08:35 AM
тАО08-31-2004 08:35 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
shouldn't the best density device file contain the string "BEST" in the filename?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-31-2004 09:00 AM
тАО08-31-2004 09:00 AM
Re: Can a DDS1 tape written in a DDS2 tape drive readable in a DDS1 tape drive?
DDS-1 was enhanced with the 90 meter tape but compression was not available. Later, there were DDS-1 DC (Data Compression)drives that used both 60 and 90 meter tapes. At the same time, a media recognition system was developed using holes in the leader. This was mandatory because new DDS standards used thinner tapes that easily wrapped around the tape path in older drives. MRS tape drives will reject (pop out) incompatible tapes (ie, DDS-3 tape into a DDS-2 drive). However, early DDS1 and DAT tapes had no MRS holes so DDS2 (and higher) would treat such tapes as READ-ONLY, the reason is that the error rate is too high to be used in a data application.
So after all that, the most important key is that an official DDS-1 tape be used (90 meters) and do NOT use the *BEST* density since the target tape drive may not understand compressed tapes. DDS-1 is not a very reliable format and with all the special rules (MRS, DAT vs DDS, 60 vs. 90 meters, compressed/uncompresed) so you would be much better off looking for a DDS2 drive to replace your aging DDS1 drive.
Bill Hassell, sysadmin