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RMAN Backup on a cluster [message #360560] Fri, 21 November 2008 06:40 Go to next message
rsreddy28
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Registered: May 2007
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Hello ,

what is RMAN MULTI NODE BACKUP IN CLUSTER ENVIRONTMENT?

Can somebody help me on this .

Regards,
Raj
Re: RMAN Backup on a cluster [message #360564 is a reply to message #360560] Fri, 21 November 2008 07:02 Go to previous messageGo to next message
Mahesh Rajendran
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You mean , How to backup in multiple nodes environment in RAC using RMAN?

You need to connect to one of nodes and perform backup.
Each node/participating instance will have its own archived log destination.
Backup all the archived logs.
If you are new to RAC, start with Oracle 9i RAC administration guide.
Things are presented much simple in that version of documentation.
A lot changed now, but the basic concept is same. Update yourself with current version later.

[Updated on: Fri, 21 November 2008 07:12]

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Re: RMAN Backup on a cluster [message #360568 is a reply to message #360564] Fri, 21 November 2008 07:12 Go to previous messageGo to next message
rsreddy28
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No, I want to know what is the concept of RMAN MULTI NODE BACKUP IN CLUSTER ENVIRONTMENT

is it like configuring all the archivelogs and the RMAN backups of all the instances on the shared storage?

--Raj
Re: RMAN Backup on a cluster [message #360570 is a reply to message #360568] Fri, 21 November 2008 07:15 Go to previous messageGo to next message
Mahesh Rajendran
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>> RMAN MULTI NODE BACKUP IN CLUSTER ENVIRONTMENT
It seems like a tech jargon.
Where did you find it? Post a reference. I could not find a reference for it in Oracle Docs.
Re: RMAN Backup on a cluster [message #360571 is a reply to message #360568] Fri, 21 November 2008 07:17 Go to previous messageGo to next message
Michel Cadot
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For Oracle search:
Your search term RMAN MULTI NODE BACKUP IN CLUSTER ENVIRONTMENT did not match any topics.

So check Google:
http://www.google.com/search?hl=en&q=RMAN+MULTI+NODE+BACKUP+IN+CLUSTER+ENVIRONMENT
or explain us what you mean

Regards
Michel

[Updated on: Fri, 21 November 2008 07:17]

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Re: RMAN Backup on a cluster [message #360574 is a reply to message #360571] Fri, 21 November 2008 07:38 Go to previous messageGo to next message
rsreddy28
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Registered: May 2007
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we have a 4 node cluster and we are taking the RMAN backups directly to the tape, even though it's slower.

I want to know what is the advantage of taking the RMAN backup to the tape over the shared storage.
Re: RMAN Backup on a cluster [message #360578 is a reply to message #360574] Fri, 21 November 2008 08:03 Go to previous messageGo to next message
Mahesh Rajendran
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>>we are taking the RMAN backups directly to the tape, even though it's slower.
It is not always that tapes are faster and disks are slower.
It depends on how you have configured your MML, backup settings etc.
Backing up to disks that are attached with fiber connections are much faster.
>>I want to know what is the advantage of taking the RMAN backup to the tape over the shared storage.
if you can afford a separate shared storage, go for it.
Just make sure, you are not backing to same SAN your datafiles are also existing.
If your need is to keep the rman backupsets for extended period in disks (most useful if you are duplicating very frequently), restores can be made faster.
Direct tape backups eliminate the need to backup do disk and then to tape.
Re: RMAN Backup on a cluster [message #360767 is a reply to message #360578] Mon, 24 November 2008 00:16 Go to previous messageGo to next message
rsreddy28
Messages: 295
Registered: May 2007
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Hi Mahesh,

My doubt is can we use a Tape device inplace of a shared storage, something like common Tape device which can be accessed by all the nodes in the cluster. Can we configure something like that .

Please help me out .

--Raj
Re: RMAN Backup on a cluster [message #360983 is a reply to message #360767] Mon, 24 November 2008 09:20 Go to previous message
Mahesh Rajendran
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Usually it is the other way around.
Since the "shared storage" is visible from all nodes, the Tape library can see all the "shared stuff" from one node.
There is no point in making the tape device to be "shared".

It also depends on how you define your "shared storage".
In some cases, NDMP tape backup is better.
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