I have prepared new vc 5.1 and configured new cluster using 8 esxi 4.1 host, multiple vms are running on these 8 host, and showing utilization till 80%..have few concerns..
1.Please advice best approach to upgrade host one by one to avoid any failure/outage for my running prod environment ?
2.And also confirm how vmware tools and hardware version should be upgraded for different vms-after host upgrade with min downtime ?
3.In case any failure during host upgrade,is there any back out plan we can preserver before upgrading host?
4.Can we go for vmfs upgrade after upgrading complete cluster [all host in cluster] or have to upgrade vms first with updated h/w version/vmware tools ?
5.Is it require to upgrade all host first(in cluster/datacenter/vc) which are connected to specific datastore before we go for vmfs upgrade?