Re: SAN Reservation Contention problem

Bill, I see a few issues here:

1) Single point of failure with your Intel Pro MT. Public and private on the
same nic? That is not a best practice. Buy at least one more NIC.

2) After you buy a second NIC for the private, team the Public (on two
different NIC's if possible) using Fault Tolerance and not Load Balancing.
Teaming the Public is another best practice.

3) Hardcode the Public to 1000 and not auto. If you can't do this, it's
because you are not running the correct/latest Intel drivers. Go to Intel
and download them.

4) None of the above have anything to do with your SAN issue. Check out the
firmware, bios, and drives for the HBA's, I am beating the are not the
latest.

5) As for your suggestions below don't do any of them, since they won't
help, only my number 4 will. My 1-3 are best practices, but they won't help
your SAN.

Cheers,

Rodney R. Fournier

MVP - Windows Server - Clustering
http://www.nw-america.com - Clustering Website
http://www.msmvps.com/clustering - Blog
http://www.clusterhelp.com - Cluster Training
ClusterHelp.com is a Microsoft Certified Gold Partner


"Bill Bradley" <wdbradley3@xxxxxxxxxxx> wrote in message
news:ObpOyl63GHA.512@xxxxxxxxxxxxxxxxxxxxxxx
I have two, two-node, Active/Active, Server 2003 w/SP1 clusters, with
shared disks on a XioTech Magnitude 3D 3000e connected via a pair of McData
4400 fibre switches. The Public and Private networks are the two ports on
an Intel Pro/1000 MT dual-port card, with the Public at 1 Gb Auto, and the
Private using crossover cables at 100/Full. The HAB's are QLogic 2310F.

I had been having some problems with the backup system (CommVault), where
tape drives or the library were dropping offline, so, had incidents open
with both XioTech and CommVault.

XioTech tells me that I have a serious problem with reservation
contentions on the SAN's disks, and, that this is NOT a SAN or zoning
problem, but a Microsoft Cluster problem.

I don't know what to adjust on my clusters. I've verified all the
settings, and, they all seem correct with the best tips and tricks. I
also don't see a LOT of errors on the Windows side, like they say they are
seeing on the SAN side (hundreds per minute).

They say this is likely a communications problem, and, I'm looking at
changing three things:

1. Private to 10 Mb/Half.
2. Under the Network Name parameters, remove Enable Kerberos
Authentication.
3. Under the Network Name parameters, remove DNS registration must
succeed.
4. Disable multicast on the cluster (even though it's only two nodes).

I don't particularly see that I NEED to do this, but...can't see anything
else to do.

Any ideas on this?

Thanks!



.

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