DiRT restore will only restore to the SAME version that you backed up. It cannot be used for upgrading Unity. Unity 3.1 still uses the USB dongle so to install 3.1 on new servers would require a demo/temporary USB. You can get this from your account team. Have you considered upgrading your current box to 4.2 (unless you are running on a non-supported platform for that version). That would allow you to perform the upgrade and move into FlexLM without the dongle first. Then you could install a demo version of Unity 4.2 on the new server, using demo license CiscoUnity4.0.lic which comes on the DVD and move your users with DiRT backup to the new server. This method also allows you to test the new server with a couple of test users beforehand.
Thanks for the response. I was hoping to leave the production system alone until I had the replacement ready - and made sure everything was in order. I will need to re-think the strategy....or get one of the dongles
I'm going to bring up this bug because it is currently biting me in the a%&. Check out bug CSCec63309. It causes the secondary of a failover pair to fail, if the primary was upgraded from 3.1(x) to 4.0(x). I would try and find out if this bug affects upgrades to 4.2 as well, so you might be ready to do a full reinstall immediately after you do your upgrade.
CSCec63309 was marked un-reproducable and the internal comments refrence the defect below as addressing the issue in Cisco Unity 188.8.131.52 which was pre 4.0(4). So the issue was resolved with the release of Cisco Unity 4.0(4)
Failover - Problems when one server upgraded and other new install
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