Re: Best fs for Oracle RAC

From: DA Morgan <damorgan_at_psoug.org>
Date: Tue, 25 Sep 2007 22:21:59 -0700
Message-ID: <1190784109.485582@bubbleator.drizzle.com>

hjr.pythian_at_gmail.com wrote:
> On Sep 26, 1:24 am, DA Morgan <damor..._at_psoug.org> wrote:

>> hjr.pyth..._at_gmail.com wrote:
>>> On Sep 25, 3:16 am, Steve Howard <stevedhow..._at_gmail.com> wrote:
>>>> I agree with this.  To provide an actual real-life specific example,
>>>> we switched from IBM FAStT storage to EMC by adding the EMC disks to
>>>> the existing diskgroup (originally with only FAStT storage).  Once the
>>>> rebalance to include the EMC disks had completed, we dropped the FAStT
>>>> disks from the diskgroup.  Clean and easy.
>>>> Regards,
>>>> Steve
>>> As a fan of ASM, it's always nice to see the good stories. But what
>>> you've described is not a "migration" in my book. If I had to pick a
>>> word, it's a "transition" from one storage vendor to another. No less
>>> a powerful demonstration of ASM's capabilities for all that, of
>>> course... but not (I suspect) what the OP and Bob were originally
>>> talking about.
>> Technically you are correct but neither of us writes the docs or
>> defines the words bandied about by storage vendors.
>>
>> Whether that was the point of the original question requires either
>> the OP or Bob to respond. But it again points out the likelihood of
>> misunderstandings when terms are not well defined.
>> --
>> Daniel A. Morgan
>> University of Washington
>> damor..._at_x.washington.edu (replace x with u to respond)
>> Puget Sound Oracle Users Groupwww.psoug.org

>
> Which was precisely my point: in your rush to denounce Bob as
> obviously ignorant, you neglected to identify what you thought he was
> ignorant about.
>
> Now you concede that he might not have been ignorant at all, but just
> using a word ("migration") with a different meaning than what you had
> **assumed** it should mean.
>
> How about clarifying meaning BEFORE rushing to judgement? That way,
> you won't leave OP's seeking actual insight stranded in a sea of
> rhetorical denunciation.

Were it not for a substantial history, available for your review, I would agree. Unfortunately Bob just got off a rant telling Jonathan Lewis and Richard Foote they didn't know anything about BHCR and treating Connor's classic work like it was unworthy of note. Coming from that background I think it reasonable to assume, as I did, that Bob's only purpose was to be negative toward an Oracle technology of which he was totally and equally ignorant.

Here in the US we commonly discuss using ASM for migration. And Bob is here in the US. So his usage, if he knew anything of the topic, should have been that usage.

Failing that one could go to tahiti.oracle.com and look up "ASM" and "migration" and find page after page of docs discussing the value of ASM with respect to migration. Not one of which, that I can find, discusses using ASM to change operating systems.

So were it another situation or another thread I would agree. In this case I believe my assumptions reasonable.

BTW: Bob's name isn't Bob. Read his BHCR posts and remember back a few years to some phony Amazon reviews.

-- 
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu (replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org

Received on Wed Sep 26 2007 - 00:21:59 CDT