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question on RAC configuration [message #304575] Wed, 05 March 2008 12:52 Go to next message
pavan27
Messages: 50
Registered: December 2006
Location: bangalore
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Michel and Mahesh ,

how are you. i got so many answers form you. thank you very much for help.
Now i am trying to learn Oracle RAC. i am following this link to understand concept. please find the link http://download-uk.oracle.com/docs/cd/B19306_01/rac.102/b14197/admcon.htm#CJHGEJGJ

i have some doubts in the clusterware architecture and clusterware processing. According to document clusterware has two components. those are 1) voting disk and 2) OCR

my questions are:

what is voting disk? what kind of information voting disk maintains.

2)what king of information that OCR holds?
3) what is the specific reason for interconnected private network?

i am very keen to learn RAC and i want to become RAC specialist as soon as possible.

could you please help to get big picture on above topics.
Re: question on RAC configuration [message #304576 is a reply to message #304575] Wed, 05 March 2008 13:03 Go to previous messageGo to next message
Mahesh Rajendran
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Registered: March 2002
Location: oracleDocoVille
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All your questions are answered in the same document/section you have already referenced
For 1 and 2
http://download-uk.oracle.com/docs/cd/B19306_01/rac.102/b14197/admcon.htm#CJHECEEH

For 3rd question:
Quoting the same document
Quote:
Oracle RAC uses the private interconnect for inter-instance communication and block transfers.
Re: question on RAC configuration [message #304584 is a reply to message #304576] Wed, 05 March 2008 13:30 Go to previous messageGo to next message
pavan27
Messages: 50
Registered: December 2006
Location: bangalore
Member
Mahesh,

Thanks for your reply. i need one more clarification. in the document i found that "all Oracle processes are under the control of the Oracle clusterware".

oracle process means all background process like ( SMON, PMON, MMON, ckpt, dbwr, lgwr ....)
all these process are under control of clusterware.

am i correct? i just want to make sure these things.

one more thing is in RAC how many clusters can access the same database. means

cluster means group of nodes. is it possible that 3 clusters can access same database.

Regards,
Pavan

[Updated on: Wed, 05 March 2008 13:48]

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Re: question on RAC configuration [message #304715 is a reply to message #304584] Thu, 06 March 2008 05:56 Go to previous message
Mahesh Rajendran
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Registered: March 2002
Location: oracleDocoVille
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Quote:
cluster means group of nodes. is it possible that 3 clusters can access same database.

You are confusing yourself with the above statement.
If 1 (one) cluster has 3 (three) nodes, then all three can access the same database with each having separate instance.
>>is it possible that 3 clusters can access same database
But 3 Different clusters cannot access the same database. Makes no point. If you need so, just put all nodes in 3 clusters (3 nodes per cluster , total 9 nodes) in the same cluster.

>>one more thing is in RAC how many clusters can access the same database.
I do not know. It depends on version. I believe in 10gR2 it is around 100. I may be wrong.

[Updated on: Thu, 06 March 2008 05:57]

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