Re: clustering and high availability?

From: Michael Austin <maustin_at_firstdbasource.com>
Date: Mon, 14 Jun 2004 16:00:43 GMT
Message-ID: <LYjzc.6210$Pn5.2533@newssvr22.news.prodigy.com>

Thomas Kyte wrote:
> "Howard J. Rogers" <hjr_at_dizwell.com> wrote in message news:<40cd533a$0$11521$afc38c87_at_news.optusnet.com.au>...
>

>>"Daniel Morgan" <damorgan_at_x.washington.edu> wrote in message
>>news:1087195407.21563_at_yasure...
>>

>
>

>>But let's ask him: Tom, did you really mean to say that RAC was a clustering
>>topology in its own right? Or were you using clustering topology language
>>because RAC (usually) runs on top of such a topology, and therefore the two
>>could at a stretch be encompassed with the same terminology? Perhaps Tom
>>will help us out with a clarification. Then we can discuss whether he's
>>right or wrong based on that clarification (and, incidentally Daniel, just
>>because Tom is a VP at Oracle doesn't mean he turns water into wine, or
>>falsities into facts... so cut the appeal to authority, because it won't
>>wash).
>>

>
>
> I was using clustering topology language as an analogy -- and took it
> too far.
>
> We run in a "shared disk" (which I guess in my database state of mind
> i liberally extended to shared everything for in the database state of
> mind, the disk is everything :) as opposed to "do not share disks,
> partition" mode.
>
> I'll be more precise in the future. I've used it as a generalization/
> characterization over time.
>
> It would technically be about shared disk, which I over generalized to
> be a "shared everything".
>
> About that water into wine thing -- I'm still working on that. It
> could save me huge amounts of money.
>
> I totally agree with authority thingy, just because I (or *anyone*)
> said it doesn't make it true. My favorite slide in a technology
> presentation is entitled "Question Authority". Everyone can (does?)
> make over generalizations, push analogies past their limits of
> believability, jump to incorrect conclusions. I know I have -- it is
> good to have it pointed out over time (makes us all look less stupid
> since we don't keep repeating it). Precision of words is important --
> especially in technology.
>
> Clarifications appreciated

Although, Tom, if you were referring to RAC in an OpenVMS Galaxy, you would be a lot closer to "shared everything" as CPU's can be moved from one OS instance to another - even if one of those systems is Itanium - dymanically. :) (reference the HP GS1280/RX2600 Galaxy Cluster with Oracle 9iRAC demo)

Michael Austin. Received on Mon Jun 14 2004 - 11:00:43 CDT