Recently I saw an ESATA RAID tower advertised by NewEgg. It contains 4 SATA drives and connects to the system via a single ESATA port. (price was pretty nice). My question is this.
In a typical system the SATA controller will sit directly on the PCI bus. In this external RAID controller, it seems to me that the communication from the SATA controller would have to go through some sort of protocol conversion to get passed via another layer of SATA to get back to the system. In essence, serial to parallel, back to serial, then again to parallel. Is this thinking correct, or am I all wet on this? If I am correct, wouldn't that likely introduce added latency and degrade performance relative to a RAID controller right on the bus?
Thoughts on the matter welcomed.
In a typical system the SATA controller will sit directly on the PCI bus. In this external RAID controller, it seems to me that the communication from the SATA controller would have to go through some sort of protocol conversion to get passed via another layer of SATA to get back to the system. In essence, serial to parallel, back to serial, then again to parallel. Is this thinking correct, or am I all wet on this? If I am correct, wouldn't that likely introduce added latency and degrade performance relative to a RAID controller right on the bus?
Thoughts on the matter welcomed.