Merlin, On 10/25/06 8:38 AM, "Merlin Moncure" <mmoncure@xxxxxxxxx> wrote: > in theory, with 10 10k disks in raid 10, you should be able to keep > your 2fc link saturated all the time unless your i/o is extremely > random. random i/o is the wild card here, ideally you should see at > least 2000 seeks in bonnie...lets see what comes up. The 2000 seeks/sec are irrelevant to Postgres with one user doing COPY. Because the I/O is single threaded, you will get one disk worth of seeks for one user, roughly 150/second on a 10K RPM drive. I suspect the problem here is the sequential I/O rate - let's wait and see what the dd test results look like. - Luke
