10-15-2010 12:24 AM
Using backup exec 12.5 SP5 on Win2003 server with HP Ultrium 3 SCSI tape device.
Our LTO3 tapes only get half used but indicate full. Tried software compression on/off - no difference. Tape drive doesn't support H/W compression.
10-15-2010 12:27 AM
I'd suggest the following:
1. Use HP Library and Tape Tools (HP LTT) to update the firmware on your tape drive.
2. Get the latest drivers (and maybe any available updates too!) for Backup Exec 12.x and install them. Once done, run the Device Configuration Wizard and install the latest Symantec drivers. Try a backup job again, and post the results here...
10-15-2010 12:59 AM
When I see the screenshot it looks like there is not used any compression.
What kind of data are you trying to backup? Maybe it is uncompressable data?
10-15-2010 01:30 AM
If data is not compressed, it is 1:1 which means that the tapes would fill up as much as possible...not stop at 50%.
10-15-2010 01:32 AM
Used capacity is 390GB, so that is the uncompressed media size.
10-15-2010 04:53 AM
LTO3 drives have on-board compression - Compression on a software level, increases server overheard.
ZeRoC00L is right on the money - depends on the data - Vote +1
so is CraigV - update tape firmware - Vote +1 - have your vendor do this if still in warranty.
10-15-2010 07:38 AM
Compression is irrelevant.... you should ALWAYS be able to get the native capacity of the media. Michael should be able to get AT LEAST 390 GB on that tape. He is only getting 243 GB and the tape is reporting that it is full.
Michael, has it always been this way or did this isse develop recently? Have you contacted HP?
10-16-2010 12:36 AM
390GB is the native capacity of the tape. When you format the tape and write to it, there are going to be overheads, so you would not get 390GB of uncompressed data onto the tape. This situation is like buying a 500GB harddisk and then seeing only 400+Gb after formatting it.
10-17-2010 03:18 AM
Have you tried to (quick) erase a tape and then tried to make a backup ?
10-17-2010 11:38 PM
Have you tried to get the same tape from your supplier and go step-by-step with the setup?Maybe it is fault by manufacturing.
10-17-2010 11:40 PM
Could be true. BTW, how (physically and logically) LTO is being formatted?
10-18-2010 11:18 AM
I suggest contacting HP tech support for an analysis of your drive and media.
1. After installing L&TT, open the utility to scan the bus
2. Once the drive is found under the 'Drives' hive, select it
a. If the drive is not found, stop any application(s) that may have it locked
b. Eject any media from the drive
3. Select the 'support' icon from across the top of the screen
4. Select the 'Extract Device Data' option and wait for the process to complete
5. Select the 'Save Support Ticket' option and chose a location to store the log
11-21-2010 06:09 AM
Any news on whether or not this is sorted out?
11-21-2010 01:35 PM
Did you try cleaning the HP device, and maybe downloading some testing tool from HP.
I recently had same problem with Quantum LTO3 drive, it was writing less data then tape capacity. I noticed that the number of soft write errors was huge(about 300 000).
And it was a HW problem with the drive.
11-21-2010 04:02 PM
Have you tried with other tapes to see if this is could be the cause of drive head error or tape bad sector ?
01-25-2022 10:27 AM
I have the same issue the backup written is only Half. If I go back to the old tapes its fine.