We need to update firmware of existing Isilon to 9.7.1.x to add new Isilon nodes as recommended by support. Before we do that, we need to confirm about NDMP backup with Isilon. Because we have NDMP backup of Isilon by NetWorker, NetWorker upgrade to 19.11 from 19.10.0.4 is required. After NetWorker upgrade in Feb, some of the NDMP backups failed with error message "Hostname resolution failed ". Multiple retries will work. However, it is very annoying.
After working with support, there is new change to NetWorker in 19.11. See kb NetWorker: server upgraded to 19.11, backup fails reporting "Hostname resolution failed" | Dell US
None of the workaround in the kb above will fix the issue on Isilon. The forward DNS lookup for Isilon are actually forwarded to Smartconnect SIP from DNS server. Only option is to add a reverse entries to the DNS server for all the Isilon nodes that handle NDMP backup. Refer to link SmartConnect and Reverse DNS | Dell PowerScale: Network Design Considerations | Dell Technologies Info Hub.
So, pointer records for all Isilon nodes handling NDMP backup will be created on the DNS server for the NDMP zone name. Once that is done, all backup is fine. Keep in mind there is no change on the forward lookup which is still handled by Smartconnect SIP. Not sure if there is a fix now.
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