FAQ
Response from Matt.

-----Original Message-----
From: Zito, Matthew
Sent: Wednesday, March 28, 2012 1:58 PM
To: Hameed, Amir
Subject: RE: Using multiple NICs for Oracle dNFS

If you could forward my response to the list, I'd appreciate it, as
somehow my posting to the list is broken.

The short answer is that they can be in the same VLAN, but different
*logical* networks, or different VLANs and different networks.

The longer answer is that you need something like

Nic0 - 10.1.1.5/24
Nic1 - 10.1.2.5/24

And on the filer:

Nic0 - 10.1.1.6/24
Nic1 - 10.1.2.6/24

You can have them on the same VLAN or different, it doesn't really
matter at this point. If they're on the same network, so, for example:
10.1.1.5/24 is nic0 and 10.1.1.4/24 is nic1, the box will not properly
load balance traffic between the two networks.

When you say traceroute, what does the output look like? If you're
expecting to get 10gb speeds, you really need to make sure that there
are no routers in between your filers/NAS heads and your database
machines.

Matt

--
Matthew Zito
Product Development Architect
BMC Software

-----Original Message-----
From: oracle-l-bounce@freelists.org
On Behalf Of Hameed, Amir
Sent: Wednesday, March 28, 2012 1:52 PM
To: oracle-l@freelists.org
Subject: Using multiple NICs for Oracle dNFS

Folks,
When configuring multiple NICs (two in our case) for dNFS per RAC
server, do all NICs need to be in the same VLAN (assuming that private
dedicated VLANs are used) or does each NIC need to be in its own private
VLAN?

We have configured two 10GbE NICs in a private VLAN on each RAC node.
However, when I run trace-route (these are Solaris boxes) from the dNFS
NIC IPs to the NAS IP, trace-route works fine on one NIC and not on the
other and this behavior is consistent on all RAC nodes where trace-route
is working fine on one of the NICs and not on the other. Our networking
people are not able to figure out what is causing it. Our Unix people
believe that if multiple NICs are part of the same VLAN then the traffic
will go out (to NAS) only from one NIC but will be received by both NICs
(from NAS). I am not a networking expert and would appreciate if anyone
can provide some feedback.



Thanks

Amir




--
http://www.freelists.org/webpage/oracle-l


--
http://www.freelists.org/webpage/oracle-l

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  • D'Hooge Freek at Mar 28, 2012 at 6:24 pm
    To add to Matt's response:

    From 11.1.0.7 onwards you can add the "dontroute" parameter to the oranfstab file to allow the usage of multiple nics in the same subnet.
    I have however not done any tests to see how well this works.

    Also, in that case I think you can have a situation where the switch decides to use the same outgoing port for all traffic, even if the source (incoming) port is different.


    Kind regards,

    Freek D'Hooge
    Uptime
    Oracle Database Administrator
    email: freek.dhooge@uptime.be
    tel +32(0)3 451 23 82
    http://www.uptime.be
    disclaimer: www.uptime.be/disclaimer

    -----Original Message-----
    From: oracle-l-bounce@freelists.org On Behalf Of Hameed, Amir
    Sent: woensdag 28 maart 2012 20:05
    To: oracle-l@freelists.org
    Subject: FW: Using multiple NICs for Oracle dNFS

    Response from Matt.

    -----Original Message-----
    From: Zito, Matthew
    Sent: Wednesday, March 28, 2012 1:58 PM
    To: Hameed, Amir
    Subject: RE: Using multiple NICs for Oracle dNFS

    If you could forward my response to the list, I'd appreciate it, as
    somehow my posting to the list is broken.

    The short answer is that they can be in the same VLAN, but different
    *logical* networks, or different VLANs and different networks.

    The longer answer is that you need something like

    Nic0 - 10.1.1.5/24
    Nic1 - 10.1.2.5/24

    And on the filer:

    Nic0 - 10.1.1.6/24
    Nic1 - 10.1.2.6/24

    You can have them on the same VLAN or different, it doesn't really
    matter at this point. If they're on the same network, so, for example:
    10.1.1.5/24 is nic0 and 10.1.1.4/24 is nic1, the box will not properly
    load balance traffic between the two networks.

    When you say traceroute, what does the output look like? If you're
    expecting to get 10gb speeds, you really need to make sure that there
    are no routers in between your filers/NAS heads and your database
    machines.

    Matt

    --
    Matthew Zito
    Product Development Architect
    BMC Software

    --
    http://www.freelists.org/webpage/oracle-l

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