5 posts

Reassign Isilon node IP addresses; go OCD!

A while ago I installed two new Isilon H400 clusters. With any IT infrastructure, consistency and predictability is key to a trouble-free experience in the years to come. Cables should be neatly installed, labeled and predictable. Wiring in the internal network cables, it helps if the nodes 1 through 4 are connected to switch ports 1 through 4 in order, instead of 1,4,2,3. While some might consider this OCD, it’s the attention to detail that makes later troubleshooting easier and faster. Like a colleague said: “If someone pays enough attention to the little details, I can rest assured that he definitely pays attention to the big, important things!”.

So I installed the cluster, configured it, then ran an isi status to verify everything. Imagine my delight when I saw this:

Isilon nodes before reassigning node IPs


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Isilon node loses network connectivity after reboot

Isilon H400 chassis with serial cable attachedIn my previous post I described how to reformat an Isilon node if for some reason the cluster creation is defective. After we got our new Gen 6 clusters up and running, we ran into another peculiar issue: the Isilon nodes lose network connectivity after a reboot. If we would then unplug the network cable and move it to a different port on the Isilon node, the network would come online again. Move the cable back to the original port: connectivity OK. Reboot the node: “no carrier” on the interface, and no connectivity.

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Data Domain DD3300: Bye LACP, Hello DDBoost Interface Groups!

DD3300I recently deployed a  new 32TB Data Domain DD3300 system. The initial configuration is easy and familiar enough. Connect to the system via the serial cable, setup iDRAC, and run the initial configuration wizard. Afterwards the rest of the configuration can be performed via SSH and/or the GUI.

While continuing with the configuration, I noticed I could not create an aggregate Ethernet interface. No LACP or Etherchannel! So what if my Ethernet interface goes down, for whatever reason?

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VNX Unified standby data mover interface suspended after Cisco NX-OS upgrade

We’re in the midst of a VCE vBlock 340 software upgrade. Part of this upgrade process is upgrading the Cisco Nexus 5K switches that connect the blades and storage to the customer network. After upgrading the switch we suddenly noticed on the switch that the VNX Unified standby data mover (server_3) interface suspended with a “no LACP PDUs” error message. A quick check on the switch that wasn’t upgraded yet showed that interface to be online. So what’s up with that?

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Implementation Day 2 – Start the Isilon

You should see something like this after you start the isilonYesterday we racked and stacked the EMC Isilon systems, prepared most of the cabling and pretty much prepared to start the Isilon systems. Which is pretty uneventful if you consider we’ve been dragging along hundreds of kilograms of equipment all day yesterday… The whole process can be pretty much split in four parts: configure the cluster and initial node, join the remaining nodes, configure the network, configure the rest.

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