Yes, I saw the release notes, but currently I am not concerned about the versions. I was just after whether it can be done or not.

We do not have support for DD. As DD are used by dev team. So whenever they want to test new build, they tell us, and we do Fresh via Avocent. So was just curious, if Fresh can be done via GUI or not.

Firstly, 5.1 and 5.2 are both old versions - I would urge you to look on support.emc.com for details on latest DDOS versions that are applicable to your environment.

In there you will also find details in the release notes about how to perform a DDOS upgrade and how many hops you might need to make from 5.1 to the latest releases (5.7 is the very latest but you may not need to go that high yet if you're on 5.1 - I assume it's an older system).

Short answer though is;

You can upload the new DDOS version via the DD GUI.

I recommend you reboot prior to performing an upgrade and check for any alerts.

My preference is to perform the DDOS upgrade from the CLI "system upgrade DDOS.version-whatever.rpm" - this is after you uploaded the RPM via the DD GUI and removed any old versions that are already applied.

You do not need a KVM, if that's what you're asking about in your query against 'Avocent'.

For a fresh install - please raise a support call, it's a different package/process to re-install DDOS completely - it's not something that is usually required but speak with support and they will advise you directly.

Regards, Jonathan

In other words, How to Do "Fresh Install" of DD OS "Remotely"?

It is kind of silly to state you don't have support and then ask for support :-D 

Anyway, update packages you can do via GUI/CLI on top of existing release and this is how it is designed to work for customers.  In very special case, when you need new release, you need something like USB installation of DDOS which you can get from support (in your case you can't).  The whole reboot with new version removes previous data so it is not clear to me why you even test this in the first place. 

Ok, so new installation has to be done by USB or PXE only. Actually I support local Dev/Test teams, who requests Fresh install because of the different build testing.

I need to second this post - we needed to a fresh install to correct several issues.  Support assisted us with backing up the licenses beforehand, but on the new code, we could not reinstall one of the capacity licenses.  It took our local sales team and Support a week to get new licenses working.  Be sure to backup your licenses - twice!  In two, different locations, if you're particularly paranoid.