This is my first upgrade of Pulse secure SSl VPN device. Could you share your experience on it? As far as I understand I can upgrade it directly from 8.0R10 to 8.1R4. And there is should not be any issues. But anyway, I would like to hear your advice, for example what I should check before and whether I can use this approach https://www.pulsesecure.net/base/images/kb-images/kb-files/techpubs/software/ive/guides/howtos/How_To_Junos_Pulse_Secure_Access_Cluster_Upgrade.pdf
Re: Clauster upgrade of MAG4610 from 8.0R10 to 8.1R4
Upgrade should be easy enough however you can take following precautions,
1. Take backup of all the logs and delete them all from appliance. that will speed up the box to come back after reboot because all the logs are achieved before reboot. 2. Take system config, certificate etc backup just in case it does not come back after reboot.
Lastly, have patience because it sometimes take 15-20 mins to come back after reboot.
You can also refer the how-to guide for upgrade though upgrades are straight forward.