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
to understanding clustering, I can highly recommend Pfister's In Search of
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?
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