Its running ESXI 4.0 at the moment but from a single hard drive as none of the on-board controllers are supported by ESXI. I just don't want to buy the adaptec controller and find I need to buy SAS drives for ESXI to use in a RAID array.
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Adaptec 5405 is running fine with ESXi 4.0 in a RAID10 setup including booting from this controller. If you use the controller in a whitebox check that the controller chips are well aspirated since the controller is built for a high airflow 2U server. It's possible that you have to provide a extra fan for the controller chipset ...
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Yes it will, I have used the Adaptec 5405 with x4 Western Digital RE drives and also x4 Samsung 1TB drives.
I have played about with this card using ESXi 3.x/4x raid 1/5/10 works fine, no BBU though.
3Ware 9690sa-4i also works well but not as good as the Adaptec 5405