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RE: 10g - ASM

From: Bobak, Mark <Mark.Bobak_at_il.proquest.com>
Date: Mon, 10 May 2004 14:19:55 -0400
Message-ID: <4C9B6FDA0B06FE4DAF5918BBF0AD82CFECFCC8@bosmail00.bos.il.pqe>


Lisa,

I'm not a SAN, Unix, or Windoze expert either. Having said that, and adding that I have exactly ZERO experience with ASM thus far, I would interpret that to mean that Oracle wants to handle all=20 the disk slicing, dicing and striping as part of it's ASM strategy.

That is, you hand it raw disks, create one "LUN" (or whatever it is that provides access through the OS to Oracle) per physical disk (or mirrored disk pair). Then, ASM can determine how to slice, dice, and stripe the data across all the raw disks you give it.

That's how I interpret it. Differing opinions, authoritative confirmations or denials, are all welcomed.

-Mark

-----Original Message-----
From: Koivu, Lisa [mailto:Lisa.Koivu_at_Cendant-TRG.com] Sent: Monday, May 10, 2004 12:32 PM
To: oracle-l_at_freelists.org
Subject: 10g - ASM

Hello all,=3D20

I'm currently installing 10g on Windows 2003. Anyone using Automatic Storage Management? =3D20

I read this in the ASM documentation (below), and I'm concerned because a LUN is a logical volume. I wonder if implementing ASM is just an unnecessary pain for a SAN environment, especially considering the enormous SAN cache. =3D20

Way back when I didn't have grey hair and I worked on Unix, all my devices were logical volumes. That was standard in every Unix shop I worked in. I get the feeling I'm missing something or misinterpreting this paragraph below. It sounds like it wants direct access to disks, period.

I am not a SAN, Unix or Windoze expert. Comments, anyone? =3D20

Thanks

With Automatic Storage Management, the definition of the logical volumes of a storage array is critical to database performance. Automatic Storage Management cannot optimize database data placement when the storage array disks are subdivided or aggregated. Aggregating and subdividing the physical volumes of an array into logical volumes can hide the physical disk boundaries from Automatic Storage Management. Consequently, careful consideration of storage array configuration is required.

Lisa Koivu
Sr. Monkey
Orlando, FL, USA

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Received on Mon May 10 2004 - 13:40:26 CDT

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