On Fri, Sep 4, 2009 at 5:36 AM, Marc Bevand <m.bev...@gmail.com> wrote:
> Marc Bevand <m.bevand <at> gmail.com> writes: > > > > So in conclusion, my SBNSWAG (scientific but not so wild-ass guess) > > is that the max I/O throughput when reading from all the disks on > > 1 of their storage pod is about 1000MB/s. > > Correction: the SiI3132 are on x1 (not x2) links, so my guess as to > the aggregate throughput when reading from all the disks is: > 3*150+100 = 550MB/s. > (150MB/s is 60% of the max theoretical 250MB/s bandwidth of an x1 link) > > And if they tuned MAX_PAYLOAD_SIZE to allow the 3 PCI-E SATA cards > to exploit closer to the max theoretical bandwidth of an x1 PCI-E > link, it would be: > 3*250+100 = 850MB/s. > > -mrb > > Whats the point of arguing what the back-end can do anyways? This is bulk data storage. Their MAX input is ~100MB/sec. The backend can more than satisfy that. Who cares at that point whether it can push 500MB/s or 5000MB/s? It's not a database processing transactions. It only needs to be able to push as fast as the front-end can go. --Tim
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