[CALUG] Gigabit Ethernet

Rajiv Gunja opn.src.rocks at gmail.com
Wed Oct 19 12:30:11 CDT 2005

This might not be a solution you are looking for, but here is what I did
with a similar situation.

3 IBM AIX servers
2 are in HA ( HACMP)
1 is a standalone.

The HA cluster has 4 network cards each (2 100Mbps, 2 gig eth lan)
1 100 Mbps link to local LAN
1 100 Mbps link to heart beat to the other cluster (since we did not want to
use a switch which would see any other server heartbeats, I used a cross
over cable)
1 gig eth link I have the NFS mounts over cross over cable to the cluster
partner. Since they are connected directly, I have no issues of packet size
or worrying about switch compatibility or bridging.

The standalone has 2 network cards (1 100 Mbps, 1 gig eth lan)
1 100 Mbps link to local LAN
1 gig eth link going directly to the cluster primary node over cross over
cable for NFS traffic.

Since this is a test environment, I am allowed to do this. Also, the DB2
database size is over 524 GB each, so we needed this high speed link. You
guessed it, we are running a DB2 enterprise cluster. I had to arrive at this
design after a lot of FS tuning and hardware tuning.

If I had to do the same in production, I would have gone with CxFS or VxFS
sharing, avoiding NFS.


Rajiv G Gunja
System Analyst / Engg
SUN / AIX / HPUX / Linux Admin
IM: AOL / Yahoo / MSN : ggvrsn

On 10/19/05, Ray Lischner <linux at tempest-sw.com> wrote:
> On Tuesday 18 October 2005 07:00 am, you wrote:
> > Wouldn't PMTU discovery allow the sending host to retransmit at 1500
> > for anything not destined for the local LAN?
> Upon further reflection, I'm still faced with the problem that reports
> from the field say that jumbo doesn't work--even in a LAN (or is that
> especially?)--unless all hardware is jumbo-enabled.
> --
> Ray Lischner, Author of C++ in a Nutshell
> http://cpphelp.com
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