Archive for the ‘HA Clustering’ Category

Static ARP on a Juniper EX4200

February 15, 2011 Leave a comment

Had a requirement from a customer to add in a static ARP address for a Exchange 2010 Cas Array (Multicast NLB) I had put in.


A bit (read:lot) of digging got me to the following;


set interfaces vlan.100 family inet address arp multicast-mac 03:bf:0a:01:1f:06</DIV< div>


Where vlan.100 is the vlan ID, family inet address the “Default Gateway” for that VLAN, is the NLB address and 03:bf:0a… is the MAC address of the NLB.


You can find this by opening the NLB configuration tool and selecting properties on any node, and selecting “Cluster Parameters” 🙂


Cluster Firewall issue – An item with the same key has already been added.

January 29, 2010 1 comment

When running a HA cluster verification you may get the following;

An error occurred while executing the test.
There was an error verifying the firewall configuration.
An item with the same key has already been added.

This is typically because the NIC GUID is duplicated between cluster nodes.

This could be because servers were deployed from an image, or cloned. Personally I had this with a VMware deployed server from a Template.

Remove and re-add a new NIC (add the new one first to be sure) and re-validate 🙂

Verify cluster gives Failed to prepare storage for testing on node X status 87

January 29, 2010 5 comments

Interesting one here – if you get a Status 87 verifying a cluster’s storage, you will require to add a drive to the “hidden” 100mb partition (boot partition).


Doing so will allow you to pass, but why fail in the first place!!!

NetApp SnapDrive and creating MSCS LUN’s

January 29, 2010 2 comments

When creating a LUN for a new MSCS, here is the methodology;


  1. Create the Volume (and Qtree if required)
  2. Create the LUN from one potential node.
  3. Create a new cluster and add all nodes (failing to do so will not allow you to add the LUN’s with the following err0r;)
  4. Connect the disk and voila! (All additional disks can be created now the Cluster is up)