Most certainly as the most lag time for a backup is not the compression,
but the actual time it physically takes to write to the media.  With
tape, compression also means there is less to write.  Speeding up the
tape process in general.  You can also assume this also works with
disk-to-disc backups.

Perhaps high compression will use up more CPU cycles, but that is a
different issue after all.

Tracy Johnson
Business Analyst
Measurement Specialties, Inc.
1000 Lucas Way
Hampton, VA 23666
Office 1-757-766-4318
[log in to unmask]
www.meas-spec.com
 

> -----Original Message-----
> From: HP-3000 Systems Discussion 
> [mailto:[log in to unmask]] On Behalf Of joseph dolliver
> Sent: Friday, August 21, 2009 10:33 AM
> To: [log in to unmask]
> Subject: [HP3000-L] QUESTION USING THE COMPRESS OPTION IN BACKUPS
> 
> is using the compress=high going to shave time off full backups?
> 
> My guess is it depends on the system. That said, I have a low end
> 500-100-140 and am using compress=low and my system has 3gb 
> memory and I am
> using DDS3
> 
> 
> one of my clients has a DLT4 or 7, not sure and is running an
> N-Class-100-750 and the compress=high shaved 20 % off the back up
> time...when changing it from LOW
> 
> 
> 
> Does this sound correct?
> 
> I am guessing that it depends on cpu size and the amount of 
> memory to come
> up with the best compress option..
> 
> 
> 
> Thanks,
> 
> Joe
> 
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