On Thu, 2006-02-23 at 11:41 +0100, Johann Eggers wrote:
> Silviu Marin-Caea wrote:
>
> >On Thursday 23 February 2006 10:23, Silviu Marin-Caea wrote:
> >
> >
> >Question:
> >
> >Can we use an 100 Mbit switch for interconnect?
> >
> >
> >But: can we use 100 Mbit switch for Oracle RAC interconnect? 10gR2 DB RAC,
> >10gR2 Clusterware.
> >
> >Thank you.
> >
> >
> From my understanding using only a 100 Mbit interconnect link is too slow!
> The CacheFusion technology of RAC makes heavy use of the interconnect.
> In all presentations and conversations about RAC,1 Gbit for the
> interconnect running over a switch in a seperate VLAN is recommended.

 You seriously need to think of the interconnect link
as something more along the lines of an iSCSI or another fibre
channel connection. The whole point of cache fusion is to
effectively make your cluster nodes into solid state storage
devices.

 Inter-node block transfers can easily equal your
datafile disk IO.

[deletia]


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