The minimum to connect to an MD3000 is A03, but A04 is the latest and has been out for about 3 years now, so if you bought your enclosure this year, it came with A04 already and the MD1000 itself shouldn't need any upgrades (the drives in the MD1000 is a different story, but you cannot determine their firmware till you connect it to the MD3000).
  I am also confused as to whether I am connecting our new MD1000 to our exisiting MD3000 in unified mode or in split mode. Our existing MD3000 has 2 host controllers in the back of it. Our new MD1000 has one primary EMM and one secondary EMM. From what I can make out I will be connecting the MD1000 to the MD3000 in Split Mode by running one cable from the "in" port on the primary EMM on the MD1000 to the available port in the first host controller on the MD3000 (slot 0) and then running a second cable from the "in" port on the secondary EMM on the MD1000 to the available port on the second host controller on the MD3000 (slot 1).   Can you confirm that the above is what I need to do?   Also looking at the pre-requisites for adding the MD1000 it mentions that I need to have the following in place:   "Expanding an Existing MD3000 Enclosure with a New MD1000 EnclosurePerform the following steps to attach a new MD1000 expansion enclosure to an existing MD3000enclosure.NOTICE: The mode selector switch must be in the "joined" mode position for the MD1000 enclosure to functionwith the MD3000 enclosure.1 On the MD3000 enclosure, upgrade the controller software to A01 or later.2 On both the host server(s) and the MD3000 enclosure, follow these steps (in order) to upgradecomponents:a Upgrade the SAS 5/E adapter driver and firmware. For Windows hosts, use the update package.For Linux hosts, use the DKMS package.b Upgrade the Modular Disk Storage Manager on each host server. (The latest version is availablefrom support.dell.com.) Refer to the PowerVault MD3000 Installation Guide for detailedinformation.c Upgrade the multipath drivers on each host server. The multipath drivers are bundled with theModular Disk (MD) Storage Manager installation package.On Windows hosts, the drivers are installed automatically when you install MD Storage Managerin Full or Host mode. On Linux hosts, you must install multipath drivers manually.NOTICE: If prompted, reboot the host server(s) during the upgrade process.3 Once all components have been upgraded, shut down the host(s), then shut down the MD3000enclosure.4 Attach the MD1000 expansion enclosure to the MD3000 enclosure, following the steps given in theDell PowerVault Compatibility Matrix (available from support.dell.com)."   Is there any documentation in place that explains how to perform the firmware updates on both the MD3000 and the MD1000? Thanks.   Doug                 
Joining a new MD1000 to an existing MD3000 query