We upgraded 2 Spark 1530 clusters, and experienced the same behavior on both clusters.
What did we do :
We upgraded the Standby firewall FW2 from R81.10.00 to R81.10.07. After rebooting, FW2 had the outgoing policy and after a policy push, the correct policy was installed and firewall was in STANDBY state.
So far so good.
cluster 1 :
We upgraded FW1, firewall was constantly rebooting, responded to ping and SSH for 10 seconds before rebooting, console output :
INIT: version 2.88 booting
INIT: Entering runlevel: 3
Booting CRASH kernel...
after factory reset and upgrade, cluster was back online.
cluster 2 :
We initiated a failover to FW2 with the cluster down script, and FW2 became the active firewall. At this moment, FW1 crashed and rebooted, over and over again. In the 10 second window it was reachable, I managed to log in and do a "fw unloadlocal".
This prevented the crashing and I was able to upgrade the device. After the upgrade and policy install, cluster was OK again.
Do we do something wrong here, did anybody experienced the same behavior, known issue ?
We have 30 more cluster to upgrade !