Re: RAC Interconnect

Corrigendum

"10g RAC CRS may allow load-balancing over the VIP".

not talking of VIP here, typo error. load balancing is definitely possible in 10g RAC. pls ignore the VIP comment.

also, i've got a whiff of the rumour that LLT could be de-supported by Oracle, so in any case, you are better off with UDP in terms of performance and reliability.

thanks
anand

On 24/11/06, Anand Rao <panandrao_at_gmail.com> wrote:
>
> Alex,
>
> It would not a good idea to recommend a single interconnect based on just
> the user count.
>
> i could have 5000 users, each generating only 10K of inter-node traffic.
> so, that about 50MB/s. so, user count is not the correct yardstick.
>
> you have to measure the interconnect traffic generated by each database
> (from the application) and then decide. for testing, don't run both the
> databases together, you won't see a "per application usage".
>
> measure the traffic generated from each database with the application
> going full throttle. if you cannot simulate that, then you have no choice
> but to run the production system with both databases and then measure.
>
> so, you could do with just 1 or maybe 2 but load-balancing between them
> will be a Veritas/Solaris responsibility. 10g RAC CRS may allow
> load-balancing over the VIP, not sure.
> Gopal?
>
> guess you are on Solaris 10, so the netstat command should help to capture
> the interconnect traffic. i guess there is another command introduced in
> Solaris 10. I haven't used it, but i hope the Solaris Management Suite will
> provide some good graphical detail of interconnect traffic.
>
> you will get ~90-95 MB/s sustained, depending on the card and the latency.
> i don't know how good LLT is compared to UDP. i would suggest UDP (life is
> easier) with some good tuning of UDP buffers at the OS layer. You should
> also look at tuning the TCP buffers, though it is not directly related to
> the interconnect.
>
> hope this helps.
>
> thanks
> anand
>
>
> On 24/11/06, amonte < ax.mount_at_gmail.com> wrote:
> >
> > Hi
> >
> > As mentioned a few days ago I am installing a RAC with Verits SFRAC on
> > Solaris 10.
> >
> > I have to create 2 databases to for this RAC implementation. Both will
> > share a single Gigabit connection (using Veritas GAB/LLT). The databases
> > will be OLTP supporting around 400 users each. No chance to put them in same
> > database. I was wondering if a single interconnect would be enough?
> >
> > TIA
> >
> > Alex
> >
> >
>
>

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