On Fri, 19 Jun 2009, [email protected] wrote: > On Fri, 19 Jun 2009, Derek J. Balling wrote: > > remember that one significant performance bottleneck on current systems is > the rate at which the various portions of memory (cache) > _in_the_same_chip_ can propogate updates, and significant performance > improvements happen by people refactoring things so that it's not > nessasary to access the same memory from two different cores at the same > time. > > with vmware failover you not only need to go down through several layers > of cache out to the ram, you then need to go out the PCI buss to the > network card, over the network to the other machine. > > it's not _possible_ to replicate all memory writes in real time to another > machine with commodity hardware (or with anything close to the same > performance even on custom hardware)
You don't have to. As long as you have the memory state at the end of the last destructive I/O operation, you can just play everything forward from that point. -- Matt It's not what I know that counts. It's what I can remember in time to use. _______________________________________________ Discuss mailing list [email protected] http://lopsa.org/cgi-bin/mailman/listinfo/discuss This list provided by the League of Professional System Administrators http://lopsa.org/
