Quote:
the SCSI to SATA controller we're considering is this one from Areca which sits in this case from Chenbro. Do you know if it supports multiple slave nodes on the bus? I would have thought that in the arrangement you described, the passive node simply takes over the whole bus.
However, the way the system was described to us was that both servers were active. Was their description wrong?
Thanks for your help here btw!


Simultaneaous multiple controllers on the same bus isn't a problem, as the others who know far more about SCSI than I have explained. There is no concept of active/active or active/passive nodes on the SCSI bus, that's a higher level application thing.

I've only glanced at the parts you mention. If you don't trust your consultants to reccomend the right parts you have other, larger problems.

As the controller is a SCSI-SATA device, it should be clear that the individual disks aren't on the SCSI bus that is connected to the servers. The SCSI device (SCSI side of the controller) in your array is going to be an abstract block device -- logical disks --, and not individual disks. The SATA side is going to manage the indvidual -- physical -- disks, and there's non-trivial logic in between the two that will "translate" between the two.

--Nathan