networking

6 posts

Isilon SyncIQ uses incorrect interface: careful with mgmt DNS records!

I’ve installed quite a few new Isilon clusters in 2019. All of them are generation 6 clusters (H400, H500, A200), using the very cool 4-nodes-in-a-chassis hardware. Commonality among all these systems is an 1GbE management port next to the two 10GbE ports. While Isilon uses in-band management, we typically use those UTP ports for management: SRS, HTTP, etc. We assign those interfaces to subnet0:pool0 and make it a static SmartConnect pool. This assigns one IP address to each interface; if you do it right, these should be sequential.

Recent addition to my install procedure is to create some DNS A-records for those management ports. This makes it a bit more human friendly to connect your browser or SSH client to a specific node. In line with the Isilon naming convention, I followed the -# suffix format. So if the cluster is called cluster01, node 1 is cluster01-1, node 2 is cluster01-2, etc. However, it turns out this messes up your SyncIQ replication behavior!

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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

Aaargh!

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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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Speed up Isilon DR – SmartConnect zone alias

These Isilon nodes need a firmware upgrade!Isilon scale-out NAS systems lean heavily on DNS. DNS plays a vital role in the way the clients access the files on the Isilon cluster: clients are distributed across nodes and network interfaces based on what your DNS reports back to the clients. This is all done by the SmartConnect component in the Isilon which is configurable up to a certain extent. In this post I’ll explain what SmartConnect does and will also share a tip to speed up your Isilon DR procedure.

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