MD3000i and LACP

Short answer, no. For the MD3000i each interface has it's own IP and multipathing (MPIO) is handled at the host level. With the MPIO driver define the policy (Round Robin, Least queue depth, weighted, etc ...)

What OS are you using ? Here's a couple of general links that might be helpful :

http://www.delltechcenter.com/page/MPIO+to+PowerVault+MD3000i+with+Microsoft+iSCSI+Initiator
http://www.delltechcenter.com/page/VMware+and+iSCSI
http://www.delltechcenter.com/page/A+%E2%80%9CMultivendor+Post%E2%80%9D+on+using+iSCSI+with+VMware+vSphere
http://www.delltechcenter.com/page/Optimizing+PowerVault+MD3000i+Performance

And this performance paper is quite helpful : http://www.dell.com/downloads/global/products/pvaul/en/pvault_md3000_whitepaper.pdf

Hope that helps.

I'm using two server with Win2008 CORE Hyper-V. On each server I has two NIC (that can be aggregate to LAG) for iSCSI, and i need get max bandwidth and reliability.

Do a google search on "mpio windows 2008 core" .. you'll get some good links... for example this one - http://geekswithblogs.net/cajunmcse/archive/2010/01/09/mpio-with-windows-2008-r2-server-core-and-iscsi.aspx