Tag Archives | storage

When to Create a New LUN (The hp way!)

I know it’s not meant as a definitive technical guide but I had a good laugh when I came across this flow chart in hp’s LeftHand SAN / VMWare vSphere 4 guide.

 

Or in engineering speak: “Tighten it up ’til it breaks then back it off half a turn!”

 

Sorry if you dropped by with a legitimate question on LUN management! Actually the question in the chart about snapshots and remote copy is very valid and the very first thing you must consider when designing your LUN layout.

 

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Cheatsheet: Add HP Lefthand Storage Nodes

Here are the quick high level steps for adding new storage nodes (P4000, P5400 etc) to your HP Lefthand iSCSI SAN (AKA StorageWorks P4000).

  1. Install and cable the units
  2. Check the HP site for firmware updates and apply ONLY the recommended updates
  3. Configure iLO so you don’t have to spend so much time in the cold room (optional)
  4. At the console on each unit give the first NIC an IP address. You can leave the other one disabled for now.
  5. Download and install the latest SAN/iQ Centralized Management Console on your workstation or management server
  6. In the CMC add the new nodes by going “Find Systems” and entering the IP addresses you assigned to the nodes
  7. Under “Available devices” go to the TCP/IP settings of each node and create a bond so the two NICs become one and choose a load balancing type.
  8. Go to http://webware.hp.com/ and generate your license keys. Each unit comes with an entitlement certificate. You’ll need to provide the Feature Key (MAC Address) which can be found in the CMC under “Feature Registration” for each node.  When you get the key replace the one that’s in there by default.
  9. Right click the units and add them to an existing management group (or create a new one)
  10. Now that You have the units in the management group add them to an existing cluster (or create a new one)

Nodes must be of equal or greater capacity to existing nodes in a cluster.  If they are of greater capacity then only the capacity of the smallest node in the cluster will be usable – Maybe time to create a new cluster?

I’ll let you fill in the detail but that’s basically it.

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