Hi,

1. Thanks, I will suggest to get support for our hosts.

2. Exactly. So, you recommand to install patches on master host before slave hosts ?
   What happen if the master host is more up to date than the slaves ?

After patches installation, we can't enable host cause XAPI restart everytime and the dbsync failed.

xensource.log : https://pastebin.com/Q84XvygZ

The host has XAPI interfaces but not PIF interfaces.

This host can't mount lvmoiscsi storage but can mount other storages.
If we try to mount the ISCSI storage we have the following error :

"code": "SR_BACKEND_FAILURE_97",
  "params": [
    "",
    "Unable to retrieve the host configuration ISCSI IQN parameter",
...

But from the master host, we can see the iscsi_iqn parameter with the command xe host-param-list uuid=HOST_UUID

It's the first time we have a problem after patches installation.

I think if we solve the ISCSI problem it will work, but I don't know how to troubleshoot this one.

Could you help us please ?