Re: RAC/how should i store oracle files on a SAN

From: DA Morgan <damorgan_at_psoug.org>
Date: Mon, 01 Aug 2005 22:16:05 -0700
Message-ID: <1122959749.198992@yasure>

Andreas Sheriff wrote:
> "DA Morgan" <damorgan_at_psoug.org> wrote in message
> news:1122953947.776480_at_yasure...
>

>>Andreas Sheriff wrote:
>>
>>>"Moe" <mwahidi_at_emanagelaw.com> wrote in message
>>>news:1122922686.586023.163080_at_g14g2000cwa.googlegroups.com...
>>>
>>>
>>>>The thing is that my SAN already have RAID  and RAID 10, so do you
>>>>think it's ok if i have ASM on top of the RAID?.
>>>>Im thinking of going with raw for the two CRS files and ASM for the
>>>>rest.
>>>>
>>>>Thanks
>>>>
>>>>Moe
>>>>
>>>
>>>
>>>Aren't ASM and raid redundant?
>>>
>>>Hardware based RAID's are ALWAYS better than software based RAID's

>
> because
>

>>>the hardware based RAID has its own CPU.
>>
>>Redundant? Not at all. It is important to remember that ASM does a lot
>>more than a simple LVM (Logical Volume Manager). Sure ASM creates disk
>>groups and failover groups but it also load balances when you add and
>>remove disks. RAID isn't going to do that.
>>
>>ASM will also let you move from one array to another by sequentially
>>adding disk from one and subtracting from the other. RAID won't do that
>>either.
>>-- 
>>Daniel A. Morgan
>>http://www.psoug.org
>>damorgan_at_x.washington.edu
>>(replace x with u to respond)

>
>
> Darn it. I'm still reading the 9i official documentation.
> My knowledge of 10g must have slipped since passing the 10g cert (not using
> it and all).
>
> 'Found some interesting things the the docs (and other places) that the OCP
> certification didn't cover, though.
>
> For the next person who asks about OCP, tell them it's a good place to
> start, but as always, as has been said, almost nothing beats experience.

Trying to sort of keep a sense of direction here's what I see:

Physician ... goes to medical school ... graduates DBA/developer ... takes and passes the OCP ... graduates

Physician ... takes a residency for practical experience DBA/developer ... finds a job and hacks at it until good enough or learns to say "do you want fries with that"

Physician ... passes a medical review board of his or her peers DBA/developer ... doesn't get fired, laid-off, or off-shored

The OCP has a place. It just is no substitute for the equivalent of a residency. And that is a program our profession desparately needs.

-- 
Daniel A. Morgan
http://www.psoug.org
damorgan_at_x.washington.edu
(replace x with u to respond)

Received on Tue Aug 02 2005 - 00:16:05 CDT