Date: Wed, 10 Jul 2002 05:24:04 +0800 From: "aaron g" <click46@operamail.com> To: <cliftonr@lava.net> Cc: freebsd-cluster@freebsd.org Subject: Re: SPREAD clusters Message-ID: <20020709212404.16403.qmail@operamail.com>
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From my limited knowledge of the project I beleive this is
not out of the question. Infact it may have been Andy
himself who made reference to the VMS like clustering
technology. I'm not really in a place to give a definitive
answer but I too am interested in a solution for the
situation you describe.
- aarong
----- Original Message -----
From: Clifton Royston <cliftonr@lava.net>
Date: Tue, 9 Jul 2002 09:51:32 -1000
To: Andy Sporner <sporner@nentec.de>
Subject: Re: SPREAD clusters
>
> Is there a document explaining the scope of the project, what kinds
> of problems it's intended to address, and the overall outline or
> roadmap? I'm having a hard time getting that from the URL you posted.
> (I'm also new to this list, obviously.)
>
> Is the current project aimed at application failover and load-balancing
> for specific applications, i.e. providing the software equivalent of a
> "layer 4" or load balancing Ethernet switch?
>
> Or does it generically instantiate all network applications into the
> same failover and load-balancing environment?
>
> Or is it more like Mosix, in which servers join a kind of "hive mind"
> where any processor can vfork() a process onto a different server with
> more RAM/CPU available, but processes have to remain on the original
> machine to do device I/O?
>
> Or is it like Digital (R.I.P.s) Vax VMS or "TrueUNIX" clustering,
> where for most purposes the clustered servers behaved like a single
> machine, with shared storage, unified access to file systems and
> devices, etc.?
>
> My main practical interest is in the nitty-gritty of building
> practical highly reliable and highly scalable mail server clusters,
> both for mail delivery (SMTP,LMTP) and mail retrieval (POP, IMAP.) The
> main challenge in doing this right now is dealing with the need for all
> servers to have a coherent common view of the file systems where mail
> is stored. This means the cluster solution needs to include shared
> storage, either via NFS or via some better mechanism which provides
> reliable sharing of file systems between multiple servers and allows
> for server failure without interruption of data access.
>
> Is this kind of question outside the scope of the current project?
>
> -- Clifton
>
> --
> Clifton Royston -- LavaNet Systems Architect -- cliftonr@lava.net
> "What do we need to make our world come alive?
> What does it take to make us sing?
> While we're waiting for the next one to arrive..." - Sisters of Mercy
>
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>
--
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