UCS – Change the Bootable LUN

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I recently ran into an issue in UCS Manager where I had multiple local LUNs configured and it was setting the wrong LUN as bootable. I finally ended up opening a support case as I didn’t see anywhere to change the bootable LUN.

Change Bootable LUN

The bootable LUN is controlled by the boot policy. The steps below walk you through finding the name of your local LUN and setting the boot policy to boot from that LUN.

  • Login to UCS Manager
  • Browse to the Storage Section and look at the Storage Profile
  • Within the Storage Profile you should have a list of Local LUNs. In the example below I have 1 Local LUN named OS.

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Cisco HyperFlex – Change NTP Server After Deployment

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Recently I was in the process of deploying a HyperFlex cluster and one of the NTP servers came back as invalid due to a missing firewall rule on the network. I wanted to proceed as I still had one valid NTP server but I wasn’t sure how difficult it would be to reconfigure NTP after the HyperFlex installation. Luckily it’s pretty easy and this page can walk you through the process.

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UCS – Change Fabric Interconnect (FI) IP Addresses and/or Host Names

ucs-manager-logoInfo

Recently I ran into a situation where I was required to reconfigure the Fabric Interconnects to use a different IP address and host name. Initially, I was worried that this could be fairly complex as it might be deeply ingrained in the UCS configuration. I’m happy to report that it’s one of the easiest changes I’ve ever made. I only saw it partially documented on a single blog so I wanted to create another post in case someone else is in my same situation.

Pre-Requisites

  1. Serial connection to both FI-A and FI-B
  2. New IP addresses for FI-A, FI-B and the cluster
  3. A new root host name

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Set-Realm UCS Errors During Firmware Upgrade

 

exclamation_warningHelp! I’m in the middle of upgrading the firmware on my UCS fabric interconnects and after I upgraded the first fabric interconnect I received these set-realm errors in UCS Manager:

  • set-realm-peer-failed
  • set-realm-local-failed

If you googled around you probably found a handful of completely useless Cisco articles that suggested you Google more or call support 🙁

Good news! According to Cisco support these errors can be caused by having mismatched firmware on the fabric interconnects. To verify everything is still working properly simply login with both an LDAP account and a local account. If you can, you are safe to proceed!