[Systems] migrating to beam rider

[Tomeu Vizoso]

On Tue, Oct 20, 2009 at 07:04, Bernie Innocenti <bernie at codewiz.org> wrote:
> El Mon, 19-10-2009 a las 22:01 -0500, David Farning escribió:
>
>> If this is hard, we can post pone it until later and just copy the
>> directories.  The advantage of setting up the common mount point now
>> is that we can share a common database instance, memcache instance,
>> and file directories.  By doing this, we can point activities2.sl.o at
>> beamrider for testing.  From a user pov a.sl.o and a2.sl.o will be
>> exactly the same.  To go live we just need to flip a switch to point
>> a.sl.o from sunjammer to beam rider.
>
> We can do it, but truly scalable and fault-tolerant architectures
> are supposed to be "shared nothing". Or "share as little as required
> for consistency". Perhaps we could get along with sharing just the
> database.

What I remember from the code, is that there was a local read-only db
instance per machine, and a read-write instance that was shared by
all.

Regards,

Tomeu

-- 
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