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тАО05-25-2010 11:55 PM
тАО05-25-2010 11:55 PM
DAT - Hardware compression DAT
It says: "Your tape drive is having problems writing data. No data has been lost but there has been a reduction in the capacity of the tape."
When I reduce the size of the set, the error does not appear. I dont use compressed partitions, hardware compression is ON at the drive and in TW advanced option and the Compression type is "System" so I would expect some significant headroom on top of the 36GB (uncompressed capacity) of the drive.
This appears not to be tha case. Can anyone please give me a hint on what is wrong?
Thanks for reading and replying.
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тАО05-26-2010 02:39 AM
тАО05-26-2010 02:39 AM
Re: DAT - Hardware compression DAT
http://www.hp.com/support/tapetools
Hope this helps!
Regards
Torsten.
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тАО05-26-2010 06:54 AM
тАО05-26-2010 06:54 AM
Re: DAT - Hardware compression DAT
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тАО05-26-2010 07:26 AM
тАО05-26-2010 07:26 AM
Re: DAT - Hardware compression DAT
During this test a compression factor of above 2 is found where the compression factor in the Drive Assessment Test report above is below one.
If these figures are correct I may be better served turning hardware compression off in daily use!
From my experiences with software compression tools much of the data - roughly 50% - can be compressed by a factor 4:1. So I expect the DAT72 drive to be able to store more than what I see here.
Thanks again, and hope someone can guide me to a solution.
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тАО05-26-2010 08:05 PM
тАО05-26-2010 08:05 PM
Re: DAT - Hardware compression DAT
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
__________________________________________________
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тАО05-26-2010 11:26 PM
тАО05-26-2010 11:26 PM
Re: DAT - Hardware compression DAT
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тАО05-26-2010 11:47 PM
тАО05-26-2010 11:47 PM
Re: DAT - Hardware compression DAT
Device Analysis : Failed
Serial EEPROM Data is not accessible on this drive
Write (last 8 tapes) : Good Margin (62.2 GB)
Read (last 7 tapes) : Good Margin (39 GB)
Load/unload life : Great margin, 97% life remaining
Write Compression Ratio : 1.2:1 (last 32.5 GB)
Read Compression Ratio : 1.2:1 (last 29.2 GB)
Power on time : 180 days, 9 hours, 0 minutes
Load/Unload cycles : 234 (2% of expected life)
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тАО05-27-2010 11:14 PM
тАО05-27-2010 11:14 PM
Re: DAT - Hardware compression DAT
DAT tapes are VERY fragile and(in my experience) prone to stretching. Also, tapes used in one drive was often found to be unreadable in another.
(Its over a decade since we scrapped our last DAT drive and went for DLT, then SDLT, and these days LTO4.)
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тАО05-28-2010 01:59 AM
тАО05-28-2010 01:59 AM
Re: DAT - Hardware compression DAT
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тАО05-28-2010 02:46 AM
тАО05-28-2010 02:46 AM
Re: DAT - Hardware compression DAT
50 times may be 'cutting it close' so to speak.
We used sets of 20 tapes back then, with a 4 week rotation, and occasionally swapping out a tape to store off-site as monthly, quarterly or yearly backup, and tapes that wasn't rotated generally got junked after 2 - 3 years at the max.
(Each tape was used 12 or 13 times/year, so... )
The problem is that the tape is so thin and narrow that it takes almost nothing to stretch it.
The 'almost nothing' in this case being the speed modern DAT drives use, combined with rapid spooling back and forth, particularly when doing a restore...
I think there was once systems that used VHS tapes, which were less reliable than DAT...
(8mm video tapes just about tied with DAT)