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тАО11-20-2006 03:05 AM
тАО11-20-2006 03:05 AM
Compression on DAT72
I am using a C7438A DAT72 tape drive (firmware V601) with Veritas Backup Exec 10.0., on a Windows SBS 2003. It seems to me that I am not able to activate hardware compression. The Veritas App detects a DDS4 instead of a DAT72 drive (with its own driver). When I try to install an HP original driver I am also not able to choose compression in the setup window. In the tape tools support log hardwarecompression is disabled, but the drive passed the compression test.
Do someone know a solution of my problem????
roman
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тАО11-20-2006 09:12 AM
тАО11-20-2006 09:12 AM
Re: Compression on DAT72
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тАО11-22-2006 09:14 AM
тАО11-22-2006 09:14 AM
Re: Compression on DAT72
I tried to install the hp driver again and in the driver settings the value for compression capable is true but the value for compression enabled is false and I am not able to change these settings.
Normaly you have to configure compression via dip-switches but the switches are configured for compression enabled.
It seems to me that the driver settings and the hardware settings do not fit together; but I am not able to see the problem!
roman
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тАО11-22-2006 04:07 PM
тАО11-22-2006 04:07 PM
Re: Compression on DAT72
Note: Before running LTT ensure all backup services are stopped.
Download L&TT from,
http://h18006.www1.hp.com/products/storageworks/ltt/index.html
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тАО11-22-2006 04:10 PM
тАО11-22-2006 04:10 PM
Re: Compression on DAT72
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тАО01-03-2007 07:31 AM
тАО01-03-2007 07:31 AM
Re: Compression on DAT72
i try the tape tools but still backup exec stops at 35 GB coudl anybody fix it?
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тАО01-17-2007 09:38 AM
тАО01-17-2007 09:38 AM
Re: Compression on DAT72
Veritas don't supply drivers for USB drives and say it's up to the tape drive to do the compression.
Can anyone shed any light on this?
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тАО01-29-2007 10:42 AM
тАО01-29-2007 10:42 AM
Re: Compression on DAT72
So - can I conclusively identify hardware compression as working using L&TT so I can go back to Symantec (I'm on 10D) and get their assistance? HP moderators - please lend some assistance here (more specific than has already been offered?)
Like others in this thread, it seems this model drive and certain versions of BE are a "bad mix" at the moment...and this issue is unresolved.
Robin
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тАО02-09-2007 05:43 PM
тАО02-09-2007 05:43 PM
Re: Compression on DAT72
Here is the solution to the problem, atleast it was for me. I've had a couple techinicans work on this problem for one of our customers and they couldn't get compression enabled with this device and Backup Exec.
I removed all Symantec Drivers.
Rebooted the machine
Reinstalled the latest drivers for the device.
( THIS MIGHT NOT BE REQUIRED ) Perform the following tasks below for a potentially quicker answer...
Log into BENT
Click Devices.
Drill down to your tape drop, properties.
Configuration tab
Click DEFAULT.
Uncheck single block read/write
Make sure passthrough read/write is unchecked.
Change Block size to 64k
Change Buffer to 1024.
Run a erase.
Run a relabel.
Run a quick test back of a large ( 150mg ) test file to make sure it is working.
With a 105mg test file, it gave me 10.6:1 compression.
Side note. I know my device in the back up job is configuration for Hardware, software if not available for compression.
Have a good day, hope this helps.
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тАО02-12-2007 09:58 AM
тАО02-12-2007 09:58 AM
Re: Compression on DAT72
Robin