Disorders before upgrading a cluster

Imagine a vSphere cluster 5 constituted by the 5.0.0.x ESXI hosts.

Update Manager is configured and download updates every hour.

The servers are never updated.

  • What is advised to do before watching the update for the first time, in order to avoid potential problems?
  • In order to update ESXi hosts, is it possible to update a single host every time and wait to see if everything is ok?
  • In this case, the members of the cluster would go ESXi different versions for a while: can it be a problem?
  • How long the update should update itself a generic ESXi host? I know that the answer cannot be provided unless specifying HW configuration, but it will take minutes, hours or days?
  • Is there another suggestion to prevent possible unrest?

Concerning

Marius

What is advised to do before watching the update for the first time, in order to avoid potential problems?

First, when you talk about "update hosts", are you referring to the bundles of regular for 5.0 patches/updates or upgrade from 5.0 to 5.1?

I assume you mean the former, but the points apply generally to the latter too.

In order to update ESXi hosts, is it possible to update a single host every time and wait to see if everything is ok?

Yes, you can update only one host at a time and wait for days, or even weeks without having to patch the other hosts, while loading one patched with loads of regular work and checking all the problems (it generally won't be any notable those minor patches).

In this case, the members of the cluster would go ESXi different versions for a while: can it be a problem?

This isn't a problem at all. You can even mix different major versions of ESXi in a single Cluster (HA won't work between 4.x and 5.x however hosts).

How long the update should update itself a generic ESXi host? I know that the answer cannot be provided unless specifying HW configuration, but it will take minutes, hours or days?

Days for updating a generic ESXi host? You are about 5-7 clicks in the vSphere Client/Update Manager GUI, enter maintenance mode, waiting for the virtual machines to migrate out of the host, wait for the patches to install and the system restarted, exit maintenance mode. The whole process takes not much longer than 20 minutes for a host and is automated after clicks.

If you don't have a vMotion (which I guess is not the case, that you referred to clusters), it might be a little more complex because you must stop/power VMs manually for the restart of the host.

Is there another suggestion to prevent possible unrest?

The general practice for major updates and releases of "Update" (where the versions of VMware ESXi and vCenter updates at the same time) is to update vCenter, Manager Update and other components of the management first before moving the ESXi hosts.

Then use vCenter Update Manager to update the hosts

For more information, see:

http://KB.VMware.com/kb/2020972

http://pubs.VMware.com/vSphere-50/index.jsp?topic=%2Fcom.VMware.vSphere.vcenterhost.doc_50%2FGUID-3B5AF2B1-C534-4426-B97A-D14019A8010F.html

Tags: VMware

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