Storage

114 posts

Data Domain migration and retaining your system name and IP addresses

DD3300Several of our Data Domains are end-of-life and need to be replaced with new hardware. In most of the cases it’s a small site with a small Data Domain that only holds roughly 1 month of backups. In these cases we just install a new Data Domain next to it, reconfigure our our backup software, and that’s it. After a month, the old backups have expired and you can switch off the old Data Domain.

For the slightly larger sites, there’s more than one backup client/server writing to the Data Domain. There are Oracle RMAN backups, SQL dumps, etc. Plus the retention of backups on the Data Domain is much, much longer. In these cases you want to perform a proper Data Domain migration which retains the name and IP address of the old Data Domain, so you don’t have to touch all the clients. Here’s how you do that, and a DDBoost gotcha you should be aware of!

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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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Reformat an Isilon node and try again!

Isilon H400 chassis with serial cable attachedWhile installing a new Dell EMC Isilon H400 cluster, I noticed node 1 in the chassis was acting up a bit. It allowed me to go through the initial cluster creation wizard, but didn’t run through all the steps and scripts afterwards. I left the node in that state while I installed another cluster, but after two hours or so, nothing had changed. With no other options, I pressed Ctrl + C: the screen became responsive again and eventually the node rebooted. However, it would never finish that boot, instead halting at “/ifs not found”. Eventually, it would need a reformat before it would function properly again…

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PSA: Unity VMware VMFS replication limit hit at 64 sessions

Our company recently replaced a lot of VNX storage by new Dell EMC Unity all-flash arrays. Since we are/were primarily a VMware hypervisor house, we decided to go ahead and create the new LUNs as VMware VMFS (Block) LUNs/datastores. This however resulted hitting us a weird and unexpected replication limit at 64 sessions.

 

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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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