We're going to start the Hsphere upgrade on the cl-1 mail5 server which is only left during the earlier upgrade process for some reasons.
During the upgrade there'll a downtime of mail service of 10-15 min. approx.
Mysql server restored completely and mysql service is running fine on it from last 30 min.
In case you'll face any issues with mysql then please come on live and raise support ticket.
Mysql-8 is giving read-only file system, we're trying run file system check once again to repair it and see if that helps.
On the other side, we're in process of preparing a new server with restoring all dbs'.
web1 server is up and all services are running fine on it.
All web servers in cluster-1 has been upgraded with os level updates. :)
In case any user will face issue then please come on live chat or raise a support ticket.