We are constructing a new networking infrastructure to replace out 1GbE backbone and have decided upon using 4x Dell PowerConnect 8024F's as our "core" switches.
As per the diagram below we have 2x 8024's upstairs and 2x downstairs providing links over MMF fiber for redundancy. Data being transferred is a mixture (70/30) of iSCSI/LAN on separate VLANs.
How can we best configure these switches to allow for redundancy and throughput, 2x stacks of 2 8024's or 1x stack of 4 switches and where should LAG be employed?