louyo wrote:
PMJI
>>on a 6G SATA port
Very important qualifier.
I am running an SSD drive on an older workstation and do not see those speeds (nowhere near "orders of magnitude") due to limitations of my SATA controller (add ons are available). I have 3 drives.
That has to do more with improvements in technology than actual bandwidth. 3GB SATA would be MORE than sufficient for modern SSD drives, that is over 400 MB of throughput.. maybe even 500.
NO desktop, workstation or even enterprise drive can reach speeds enough to saturate a 6GB SATA channel *NO DRIVE*. Not even SSD, besides SSD is about response time NOT throughput. Running multiple small files or even multiple SQL databases isn't the same thing as copying large files at the same time to SSD.
Your SATA is controlled by the CPU, that's where the bottleneck is the controller *NOT* the drive. Since all drive communication goes through a SINGLE controller, there is your bottleneck.
And since drives cannot attach to more than 1 concurrent controller, we are left with whatever throughput a controller has to offer.
One more thing to point out.. say you buy a really good motherboard... do you REALLY think they will put a controller on a built in motherboard that will be far better than enterprise class controllers? RAID controllers cost upwards of thousands, a $300.00 MB from newegg, is NOT going to compete with a $2000.00 RAID controller in an enterprise machine. So if an enterprise class controller can't even handle multiple requests to single SSD drives, you won't even come close to doing it with anything less.
SSD are capable of MUCH more than current controller/technology allows... but we can't get it until something changes.
You CAN run multiple VM on a single SSD, just dont' expect miracles when you need to copy multiple VM's at once, that's when you will run out of bandwidth.
