ZCS upgrade process
I have 4 zcs servers, 2 in Taiwan(LDAP in 1, MTA/Mailbox in 1), 2 in the US(LDAP Replica in 1, MTA/Mailbox in 1). The zcs version are all 7.1.1, and I want to upgrade it to 7.1.4.
Due to non stop email working requirement from my boss, I want to upgrade LDAP to 7.1.4 first and upgrade the other servers 1 day after.
That means LDAP server is 7.1.4, the other zcs servers are 7.1.1.
Does that may cause operation problem?
Release notes said I have to stop all the servers before upgrading.
That means our email service will stop for 1hr before my servers(4 servers) are totally upgraded.
Can I upgrade only 1 server on each day? I don't want my email service stop so long.
"Multi-Server Environment Upgrade Steps
Before you begin, stop all the servers in your ZCS environment. To do this, on
each server, as zimbra type zmcontrol stop.
Important: Upgrade the servers in the following order: LDAP server, MTA
server, and then mail store server. The LDAP master server should be running
as you upgrade the other servers.