Curtis,
what you said it's partially true...
The new generation TS1120 gen 2 have that specification
Native data rates                 104 MBps
Adaptive data rates             104, 85, 70, 55, 41 and 35 MBps

What you described it's not exactly shoeshining.
It's true that if I have a fileserver backup the don't full fill the data 
buffer of the tapes (LTO - SDLT - Magstar) ,maybe for LAN backup or for the 
tipically fileserver file type (hundreds - small file) the problem will be 
for each tape technologies... BUT the Virtual Backhitch of the TS1120 will 
help you and for some tests that we made it's really true... If you backup 
Big database 10 TB(ORACLE with RMAN and 8 allocate channel) we reach 140 
GB/h  one drives... (with 4 drives parallell 140*4!!!)...

Regards!!


>From: "Curtis Preston" <cpreston at glasshouse.com>
>To: "Peter Marelas" <peter_marelas at symantec.com>
>CC: veritas-bu at mailman.eng.auburn.edu
>Subject: Re: [Veritas-bu] Shoe shining
>Date: Thu, 14 Dec 2006 04:36:00 -0500
>
>I've been a fan of this for a while.  Too bad only one vendor supports it 
>in their tape library (Qualstar).
>
>---
>W. Curtis Preston
>Author of O'Reilly's Backup & Recovery and Using SANs and NAS
>VP Data Protection
>GlassHouse Technologies
>
>
>-----Original Message-----
>From: Peter Marelas [mailto:peter_marelas at symantec.com]
>Sent: Thursday, December 14, 2006 12:37 AM
>To: Curtis Preston; marco chiapusso; Greg.Hindle at constellation.com
>Cc: veritas-bu at mailman.eng.auburn.edu
>Subject: RE: [Veritas-bu] Shoe shining
>
>This will solve your shoe-shining problem.
>
>HDD in a tape cartridge and tape drive emulator.
>
>http://www.imation.com/products/ulysses/index.html
>
>Regards
>Peter Marelas
>
>-----Original Message-----
>From: veritas-bu-bounces at mailman.eng.auburn.edu 
>[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Curtis 
>Preston
>Sent: Thursday, 14 December 2006 5:32 PM
>To: marco chiapusso; Greg.Hindle at constellation.com
>Cc: veritas-bu at mailman.eng.auburn.edu
>Subject: Re: [Veritas-bu] Shoe shining
>
>I hate to say it, but your IBM sales rep is either lieing or doesn't know 
>what he/she's talking about if he/she told you that their drives don't 
>suffer shoeshining. (Don't worry; he/she is not alone.)
>
>The TS1120 is still a streaming tape drive and streaming tape drives have a 
>minimum speed.  The TS1120's minimum speed is 40 MB/s times your 
>compression ratio (avg 1.5:1), which makes it about a 60 MB/s minimum speed 
>tape drive.  If you're not sending significantly less than 60 MB/s to that 
>drive, it is shoe-shining.  The same is true for the T10000 from STK and 
>LTO-3.  LTO-3's minimum speed is 27 MB/s, T10000's is 50 IIRC.  Not sure of 
>the minimum speed for SDLT.
>
>Here's an article I wrote about this problem:
>http://tinyurl.com/ym2sap
>
>
>
>---
>W. Curtis Preston
>Author of O'Reilly's Backup & Recovery and Using SANs and NAS VP Data 
>Protection GlassHouse Technologies
>
>-----Original Message-----
>From: netbackup-bounces at backupcentral.com 
>[mailto:netbackup-bounces at backupcentral.com] On Behalf Of marco chiapusso
>Sent: Wednesday, December 13, 2006 7:53 AM
>To: Greg.Hindle at constellation.com
>Cc: veritas-bu at mailman.eng.auburn.edu
>Subject: Re: [Veritas-bu] Shoe shining
>
>Yes sure,
>the only one that I know that are not affected of that problem are the IBM 
>Magastar tape (TS1120)
>
>Bye
>
> >From: "Hindle, Greg" <Greg.Hindle at constellation.com>
> >To: "NB List Mail" <veritas-bu at mailman.eng.auburn.edu>
> >Subject: [Veritas-bu] Shoe shining
> >Date: Wed, 13 Dec 2006 09:41:46 -0500
> >
> >How can I tell if my SDLT and LTO3 drives are show shining?
> >
> >
> >Greg
> > >>> This e-mail and any attachments are confidential, may contain
> > >>> legal,
> >professional or other privileged information, and are intended solely
> >for the addressee.  If you are not the intended recipient, do not use
> >the information in this e-mail in any way, delete this e-mail and
> >notify the sender.
> >CEG-IP2
>
>
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