Ok then I will ask again. How do I tell the write speed to tape then? 



Greg 

-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Austin
Murphy
Sent: Tuesday, September 26, 2006 11:07 AM
To: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] LTO3 show shining

Keep in mind that the data rate that matters isn't the rate of data
going over the FibreChannel interface, but the rate at which the drive
writes the data to tape.   50MB/sec over FC could be as low as
20MB/sec at the tape, which would be slower than the minimum streaming
speed.

Austin

On 9/25/06, Hindle, Greg <Greg.Hindle at constellation.com> wrote:
> Ok good. Our NDMP backups are running 50-80mb/s, with spikes as high 
> as 100mb/s. But that is direct filer to drive by FC. I am more 
> concerned about going over our IP netbackup and making sure that 
> netbackup is setup correctly to achieve that fastest rates we can get 
> with little or no show shining.
>
>
>
> Greg
>
> -----Original Message-----
> From: Justin Piszcz [mailto:jpiszcz at lucidpixels.com]
> Sent: Monday, September 25, 2006 5:20 PM
> To: Hindle, Greg
> Cc: NB List Mail
> Subject: Re: [Veritas-bu] LTO3 show shining
>
> If your speeds are < 27MB/s, you get "Shoe Shining" - 27MB/s is the 
> minimum you are supposed to run an LTO3 drive at.
>
> Justin.
>
> On Mon, 25 Sep 2006, Hindle, Greg wrote:
>
> > Nb 5.0 mp6 Solaris 9
> >
> > Ok Maybe this has been said before but with all the talked about 
> > show shining LTO3 FC drives. Currently I have NDMP backups going to 
> > my LTO
> > 3 drives. Early next year when we buy more LTO3 drives we are 
> > changing
>
> > over our non-ndmp backups to go to LTO3 drives as well.  My 
> > questions are this:
> >
> > What settings need to be changed and to what to minimize LTO3 show 
> > shining?
> >
> > How can I tell if my drives are show shining? Where do I look, what 
> > commands do I need to run etc.?
> >
> >
> >
> >
> >
> > 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-IP1
> >
>
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu at mailman.eng.auburn.edu 
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
_______________________________________________
Veritas-bu maillist  -  Veritas-bu at mailman.eng.auburn.edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu