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HP StorageWorks Autoloader 1-8 Ultrium and compression

Joseph L. Casale
Regular Advisor

HP StorageWorks Autoloader 1-8 Ultrium and compression

I am running this device under Windows 2003 sp2 using rsm and ntbackup with scripts.

This is functional and working most of the time except for odd variations in tape capacity. Sometimes the tape drive will have disabled compression on its own and thus requires rsm to be stopped, tape tools to be launched and used to reconfigure the drive.

Is there a reason why this might be happening? Also, is there any way to produce some detailed logging about tape capacity/compression rates when using rsm and ntbackup? I am open to using a different solution if required.

Thanks!
5 REPLIES
TapeDrive Killer
Trusted Contributor

Re: HP StorageWorks Autoloader 1-8 Ultrium and compression

Hi Ritmo2k there are some files that are already compressed so the hardware compression wont go any further. Why don't you try performing the LTT compression test then also try installing DPX that software will tell you what compresion you achived.Try the job with your backup soft then with DPX.

Drivers
ftp://ftp.hp.com/pub/tape/SmartComp/HPStorageWorksTapeDrivers.zip

DPX 3.5 sp2
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=12169&prodSeriesId=1144272&prodNameId=1144275&swEnvOID=1114&swLang=13&mode=2&taskId=135&swItem=co-55597-1

Pablo Alvarado
Tape Storage/DPX
One drink away from sleeping on the pavement
Joseph L. Casale
Regular Advisor

Re: HP StorageWorks Autoloader 1-8 Ultrium and compression

Pablo,
There is no uncertainty in the hardware compression being turned off constantly. The very same data spans twice as many tapes when this happens, and the driver explicitly reports it being off. I need to use Tape Tools to re-enable it.
TapeDrive Killer
Trusted Contributor

Re: HP StorageWorks Autoloader 1-8 Ultrium and compression

What Tape Drive do you have ?
One drink away from sleeping on the pavement
Joseph L. Casale
Regular Advisor

Re: HP StorageWorks Autoloader 1-8 Ultrium and compression

Pablo,
It is the 8 tape LTO-2 autoloader.
Thanks!
TapeDrive Killer
Trusted Contributor

Re: HP StorageWorks Autoloader 1-8 Ultrium and compression

Im not 100% sure but I think ntbackup doesnot control the hardware compression. Here is the information about ntbackup there is nothing about compression.

http://download.microsoft.com/download/b/d/8/bd8e1a40-d202-429a-8eb7-26300d62bcc9/BKU_BkupRstr.doc#_Toc139375348

Try using DPX

Pablo Alvarado
Tape Storage/DPX
One drink away from sleeping on the pavement