On Fri, 27 Jul 2007, Kevin Whittaker wrote:

> Recently I did quite a bit of benchmarking on restores with ORACLE RMAN
> multiplexing.
>
> We currently do 4 channels to 1 tape.
>
> Our test backup was taking 39 mins, with a full restore time of 2 hours.
> And we tested other channels, and it seems that the restore time is # of
> channels times the backup time.  So my restores are 4 times a long as
> the backup.
>
> Well, we also tested sending each channel to different tape drives.
> Well the same backup was restored in 38 mins!

How did you accomplish this?


>
> So, I am in the process of modifying my VTL to have enough tape drives
> so that we can un multiplex all of our backups.
>
> Also I will add vaulting a multiplex image takes longer than one that is
> not multiplex.  And yes, my vault profile is set to keep multiplexing.
>
> Kevin
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Justin
> Piszcz
> Sent: Friday, July 27, 2007 6:50 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Has anyone done benchmarking of any sort with..
>
> The delay on Multiplexed restores?
>
> Justin.
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