The slight mismatch in hardware is allowed on OneFS.  The NL400 and NL410s have a compatibility matrix and you can do some mixing of nodes presuming they have the same capacity disks and similar RAM.  NL410s do have "issues" when running a version of OneFS earlier than 8.0.0.4 or 7.2.1.5.  When we did a tech refresh from NL400 -> NL410s we had nothing but problems on 7.2.1.3 and were forced to take emergency downtime to upgrade to 8.0.0.4 to restore proper operation of our cluster.
Hi All,  Recently we added two nodes, after adding the nodes I did not see clients falling over to those nodes. Though both the nodes were serving SMB requests, customer faced lots of issues after nodes were added like intermittent issues, backups not running on isilon  we have two pools, were in 1 pool uses X410 and the other uses NL400 and customer had ordered 1 X410 and the other NL410, while adding the nodes X410 got added automatically and NL410 was showing in un provisioned state   EMC some how got added the node by manually adding the drives, The strange thing was NL400 has dual core processor and the newly added 1 node NL410 has single processor  I suspended both the nodes the issues were resolved.Any one has faced similar issue?  How to get those Nodes working again as support is also unable to identify the issue  Could it be compatibility issue, EMC already had confirmed it that NL410 is compatible or is there any bug with 7.2.1.2 version  we are planning to upgrade our cluster to 8.0.0.4 soon
Intermittent issue after adding 2 nodes 7.2.1.2