On Oct 4, 2012, at 9:07 AM, Dan Swartzendruber <dswa...@druber.com> wrote:
> On 10/4/2012 11:48 AM, Richard Elling wrote: >> >> On Oct 4, 2012, at 8:35 AM, Dan Swartzendruber <dswa...@druber.com> wrote: >> >>> >>> This whole thread has been fascinating. I really wish we (OI) had the two >>> following things that freebsd supports: >>> >>> 1. HAST - provides a block-level driver that mirrors a local disk to a >>> network "disk" presenting the result as a block device using the GEOM API. >> >> This is called AVS in the Solaris world. >> >> In general, these systems suffer from a fatal design flaw: the authoritative >> view of the >> data is not also responsible for the replication. In other words, you can >> provide coherency >> but not consistency. Both are required to provide a single view of the data. > > Can you expand on this? I could, but I've already written a book on clustering. For a more general approach to understanding clustering, I can highly recommend Pfister's In Search of Clusters. http://www.amazon.com/In-Search-Clusters-2nd-Edition/dp/0138997098 NB, clustered storage is the same problem as clustered compute wrt state. >>> 2. CARP. >> >> This exists as part of the OHAC project. >> -- richard >> > > These are both freely available? Yes. -- richard -- richard.ell...@richardelling.com +1-760-896-4422
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