The 9840 will get better compression if you have software compression
turned off in your NBU 

-----Original Message-----
From: scott.kendall AT abbott DOT com [mailto:scott.kendall AT abbott DOT com]
Sent: June 21, 2002 7:32 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Compression on STK9840 tapes



... and although STK loves to claim 4:1 compression (and with native
capacities like 20 GB and 60 GB, depending on drive, I don't blame them) if
you read the "fine print" wherever they post this, it will always state
something like...

4:1 compression on mainframe
2:1 compression on Open Systems

The first time I noticed this I got a good laugh.  They always plaster 4:1
everywhere and hide this at the bottom where it's not seen (if it's even
listed).


- Scott



 

                    Johnny Oestergaard

                    <joe AT joe DOT net>                        To:     Paul
Windsor <windsorpj AT lmtas.lmco DOT com>,                          
                    Sent by:
veritas-bu AT mailman.eng.auburn DOT edu                                        
 
                    veritas-bu-admin AT mailman DOT eng.        cc:

                    auburn.edu                           Subject:     Re:
[Veritas-bu] Compression on STK9840 tapes                
 

 

                    06/20/2002 03:54 PM

 

 





It's depending on your data.
I think StorageTek told us in general they see:
1:1,5 or better in NT/WIN2K env.
1:2,5 in Unix env.
1:3 - 1:4 in OS/390

We only use NT/WIN2K and we see from 1:1,5 to 1:2 on STK 9940 (should be
the same as STK 9840)
There are some DataBase backups that have a better compression.

Again, it depends on your data.

/johnny

At 12:21 20-06-2002 -0500, Paul Windsor wrote:
>We recently installed STK 9840 drives as replacements for the soon-to-be
>end-of-life STK SD-3 (REDWOOD). We expected to see better than 2:1
>compression ( according to the blurbs) but are getting much less. We are
>using NetBackup 3.4 on an SGI 3200 with IRIX 6.5.13.    Is anyone else
>seeing better ???
>
>
>Thanks for any help,
>
>paul
>
>
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