On Tue, Feb 15, 2011 at 7:03 AM, Roberto Spadim <roberto@xxxxxxxxxxxxx> wrote: > disks are good for sequencial access > for non-sequencial ssd are better (the sequencial access rate for a > ssd is the same for a non sequencial access rate) I have a more general question: say I have an ultra simple NAS system, with exactly one disk, and an infinitely fast network connection. Now, with exactly one client, I should be able to do a sequential read that is exactly the speed of that single drive in the NAS box (assume network protocol overhead is negligible to keep it simple). What happens if there are exactly two clients simultaneously requesting different large files? From the client's perspective, this is a sequential read, but from the drive's perspective, it's obviously not. And likewise, what if there are three clients, or four clients, ..., all requesting different but large files simultaneously? How does one calculate the drive's throughput in these cases? And, clearly, there are two throughputs, one from the clients' perspectives, and one from the drive's perspective. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
