[Veritas-bu] Shoe shining
2006-12-14 04:36:00
Subject: |
[Veritas-bu] Shoe shining |
From: |
cpreston at glasshouse.com (Curtis Preston) |
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,
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>CEG-IP2
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