Veritas-bu

[Veritas-bu] Shoe shining

2006-12-14 01:32:07
Subject: [Veritas-bu] Shoe shining
From: cpreston at glasshouse.com (Curtis Preston)
Date: Thu, 14 Dec 2006 01:32:07 -0500
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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