SCI and RSM for Oracle 9i RAC

Hi gurus,
Could you please confirm if we can configure 2 or more SCI interconnects (for Private Interconnects) on a E15K cluster ?
This is for a High Availability requirement for Oracle 9i RAC. What i need to know is that,
Assume that i have configured 3 SCI Cards on NODE 1 and 3 SCI Cards on NODE 2. Sun Cluster 3.1 is configured on both nodes.
1) If i activate all the cluster interconnects on NODE 1 and NODE 2, will Oracle 9i RAC based traffic flow on all the 3 cards for EACH Node, thereby providing 3 gbps of bandwidth ?
2) What if there is a failure in one of the cards? will the other 2 continue to function, if failover mechanism is configured?
3) Do i need to do something special for Oracle to be enable to recognise that 1 card has failed and it needs to start transfering packets using the other 2 surviving cards?
These questions are assuming that it is an SCI card using RSM protocol.
Will this also be applicable for a Gigabit Ethernet Card running UDP? I have heard that SCI and RSM is a very good combination and just behind the Sun Fireplane interconnects which also uses RSM.
Is that true?
Thanks a lot folks.
Regards
Spockaris

Could you please confirm if we can configure 2 or more
SCI interconnects (for Private Interconnects) on a
E15K cluster ?This is being tested now. More below...
This is for a High Availability requirement for Oracle
9i RAC. What i need to know is that,
Assume that i have configured 3 SCI Cards on NODE 1
and 3 SCI Cards on NODE 2. Sun Cluster 3.1 is
configured on both nodes.
1) If i activate all the cluster interconnects on NODE
1 and NODE 2, will Oracle 9i RAC based traffic flow on
all the 3 cards for EACH Node, thereby providing 3
gbps of bandwidth ?Bandwidth does not seem to be a problem for RAC.
Latency is a problem, but adding interconnects won't
solve the latency problem unless bandwidth was also
the problem. I haven't been able to find any customers
who have interconnect bandwidth problems on any
Sun Cluster, let alone RAC. If you know of any, please
let me know.
2) What if there is a failure in one of the cards?
will the other 2 continue to function, if failover
mechanism is configured?Yes, that is how it works today for interconnects.
3) Do i need to do something special for Oracle to be
enable to recognise that 1 card has failed and it
needs to start transfering packets using the other 2
surviving cards?No, under Sun Cluster, this is managed for Oracle.
These questions are assuming that it is an SCI card
using RSM protocol.
Will this also be applicable for a Gigabit Ethernet
Card running UDP? I have heard that SCI and RSM is a
very good combination and just behind the Sun
Fireplane interconnects which also uses RSM.
Is that true?It is true that low latency networks help performance of
RAC clusters. However, there does not seem to be a
direct correlation between interconnect latency and
performance. There are a number of studies completed
and in progress on this topic. We can generally say that
for the same RAC configuration for the same workload,
the lower latency interconnects will perform better. But
beyond that, the problem gets complex quickly and YMMV.
-- richard

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