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ASM AND RAID [message #427153] Wed, 21 October 2009 06:12 Go to next message
maoro
Messages: 310
Registered: May 2005
Senior Member
hello we have the below scenario for HA, your help is appreciated
Hardware:
- 2 identical servers in primary & secondary mode (Node1 and Node2)
- Each node having 2 CPUs
- One 2TB SAN storage with 10*200GB HDs + 2 redundant FC switches

Sofware:
- Oracle 10gR2 sofware and instance to be installed and created locally on
native HD of each node with 1:1 RAID mirroring with another identical local
HD
- Nodes in a RAC configuration.
- Storage disk arrays managed using ASM.

HA to be implemented as follows:

- 1:1 Storage redundancy (Disks 1-5 as G1 primary ASM group; Disks 6-10 as G2 secondary ASM group) -- Allowing for storage redundancy
- Both are active at any given point in time. Each node takes over the complete load in case of failover -- Allowing for server redundancy.

Clarifications needed are:

- Is this scenario possible? Does this require any additional configuration or software? Is there anything missing?

- Does the SAN need to be confgured with RAID5? Without RAID, 1TB is effectively usable at any point in time with the other 1TB used up as an ASM

mirror. Is this correct?

is RAID needed since ASM does the SAME ( STRIPE AND MIRROR EVERYTHING)
thanks
Re: ASM AND RAID [message #427200 is a reply to message #427153] Wed, 21 October 2009 09:32 Go to previous messageGo to next message
Mahesh Rajendran
Messages: 10671
Registered: March 2002
Location: oracleDocoVille
Senior Member
Account Moderator
If you use external redundancy, You relieve ASM from RAID related responsibilities.
Else ASM will take care of volume management.

[Updated on: Wed, 21 October 2009 09:37]

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Re: ASM AND RAID [message #427382 is a reply to message #427153] Thu, 22 October 2009 05:38 Go to previous messageGo to next message
maoro
Messages: 310
Registered: May 2005
Senior Member
so does this means that if i have RAID i should not use ASM ?
or i can use ASM for dynamically adding disk and rebalance operations?
Re: ASM AND RAID [message #427419 is a reply to message #427382] Thu, 22 October 2009 09:04 Go to previous message
Mahesh Rajendran
Messages: 10671
Registered: March 2002
Location: oracleDocoVille
Senior Member
Account Moderator
Time to read documentation.
http://download.oracle.com/docs/cd/B19306_01/server.102/b25159/configbp.htm#sthref94
>>so does this means that if i have RAID i should not use ASM ?
I never said that.
You can either rely on ASM for redundancy or use ASM with external redundancy (OS level).

[Updated on: Thu, 22 October 2009 09:06]

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