On Fri, 2005年12月09日 at 12:31 +0100, Eugen Leitl wrote: > I'm personally not running a cluster, but if you look into the > Beowulf list archives, people are citing impressive numbers. Beowulf performance is _inversely_proportional_ to communication load. Applications scale far more linearly when the slower 10GbE are not used than the local, HyperTransport interconnects (assuming Opteron). From what I've seen, no one is getting anywhere close to 1GBps over layer-2 communication with 10GbE for clustering. I'm talking about when you're pushing enough service data around that you need local interconnect, because 1GBps won't cut it. Beowulf is not even applicable! Furthermore, the new, preferred solution is to use HTX (HyperTransport eXtension) Infinibind cards, which will give you about 1.8GBps real- world interconnect. Infiniband's protocol is far more efficient, plus (in raw transfer terms) it's faster than GbE. But even then, you don't use Beowulf for applications where you're taxiing the interconnect (database, file, etc...). > SoftRAID easily outperforms these 100ドル-300 controllers. And 1000ドル-1500 > buys you a couple of servers, or a large pile of SATA disks. > As a semi-hobbyist, it's a pretty simple decision to make. But not both -- I'm talking about when you are spending about 1,500ドル on the combination of server and disk, adding another 300ドル is a simple decision to make. If I just want a 2-disc mirror on a 750ドル-1,000 server, then 100ドル is also a simple decision to make. A 1,500ドル-2,000+, 300ドル is nothing. Potent I/O interconnect in a single-socket server -- with server-class 1GbE NIC(s), and a PCI-X or PCIe x4 or x8 slot for storage -- runs you about 750ドル. Using a desktop nForce4's PCI by hijacking it's video PCIe x16 or using its extra PCIe x1 is not server-class -- especially not its NIC. Adding a brainless 2-channel 3Ware Escalade 8506-2 adds maybe 125ドル. Less than 20%. If I'm looking at server-class dual-socket, then I'm looking more 1,500ドル for the system, maybe 2,000ドル+ after disks. Adding a 300ドル-400 storage controller is also going to be around 20% increase. Well worth it in my experience, especially after MD screw up after MD screw up, especially when it comes to clients supporting themselves. -- Bryan J. Smith mailto:b.j.smith@xxxxxxxx http://thebs413.blogspot.com ------------------------------------------ Some things (or athletes) money can't buy. For everything else there's "ManningCard." -- amd64-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/amd64-list