Hi,

What version were you upgrading from and to? It sounds like they were not disconnecting and reconnecting properly. https://dell.to/3pMAH4x

Hi - thanks for the reply

The upgrade being performed was node and disk firmware. Currently running OneFS 8.1.2 and planning an upgrade to 8.2.2. The customer is concerned that they may see more disruption during the planned OneFS upgrade

We performed a rolling reboot before the upgrade as the cluster had not been rebooted for a long time.

We then did the node firmware upgrade and then the disk firmware.

Hello paf23,

Here is a link to a couple of additional KB that maybe of assistance. https://dell.to/3qWg0V9

https://dell.to/2MqchA9

@paf23,

 Please open an SR to investigate further. Some possible KBs.

531354 : {ISILON} Intermittent disconnection to Isilon nodes' dynamic IPs during rolling reboot or rolling upgrade. https://support.emc.com/kb/531354

490729 : Clients disconnect after IP balance when Flooding Mode turned off on Cisco Nexus switches https://support.emc.com/kb/490729

Thanks everybody for the information. I am checking with my customer to see if the KB articles are relevant to their environment.

The customer has stated that they are not using ACI - both of the supplied KB articles seem to reference ACI on the Cisco side.

I will look at raising an SR.

ensure they put mount  as defined in /etc/fstab so a static rather than pool reference can be confirmed. I completed an isilon upgrade to 9.x with similar clients with no reboots encountered.

worst case, the nfs mount should hang while the node is being  rebooted, a client reboot is not expected behavior