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Configure ASM Disk Group [message #332501] Tue, 08 July 2008 14:07 Go to next message
Messages: 1
Registered: May 2008
Junior Member
Hello Experts,

We are planning to convert our production database to 11g RAC. The size of the database is about 250GB.

For a database of this size, what will be a good practice for setting up its ASM disk group(s)?

Your input and views are greatly appreciated!

Thanks in advance.
Re: Configure ASM Disk Group [message #332789 is a reply to message #332501] Wed, 09 July 2008 13:32 Go to previous messageGo to next message
Messages: 5
Registered: July 2008
Location: Denver, Colorado
Junior Member
Really it is up to you and your SAN admin/SA. Here are a few basic practices:

1. Luns should be a consistent size if at all possible and you need to decide whether you want external redundancy (OS/SAN level) or normal/high redundancy (ASM level), the latter will take up 2 or 3 times (respectively) the disk space as the external option.

2. All luns should be the same speed or IO rate unless they are to be used for separate disk groups.

3. Determine a growth pattern to decide how much "extra" diskspace (luns) to allocate now and in the future.

250g is not a large database by todays standards, for ones that size that grow by, say 50g per year, I would start with six or seven 50g luns at external redundancy.


Jay Caviness

[Updated on: Wed, 09 July 2008 13:49] by Moderator

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Re: Configure ASM Disk Group [message #337411 is a reply to message #332789] Wed, 30 July 2008 17:11 Go to previous message
Messages: 506
Registered: March 2005
Senior Member
Having ASM is good.

ASM is the standard as per oracle.
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