Need to upgrade the zabbix environment to 2.2 from 2.0 .

• Having to 2 zabbix servers which are configured as cluster to each other. and with one proxy servers .

• 2 zabbix servers are having clustered Maria Db database .

Need a suggestion from your end , how come we can upgrade the environment , by reducing the Downtime .

shall we start upgrading the 1st server by keeping working the Second one or have to go with both at a time .

Thank you