| RAC & Redo logs [message #119012] |
Tue, 10 May 2005 05:11  |
hero
Messages: 5
Registered: May 2005
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Junior Member |
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As far as the docs say "Each instance has its own online redo log groups which are called an instance's
thread of online redo". My question is: can I put the redo logs of a given instance to local fs ( not
visible from other nodes ) , or at least can I put one member(multiplexed copy) of the group to local fs and the other members to cluster fs or asm ?
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| Re: RAC & Redo logs [message #119097 is a reply to message #119012] |
Tue, 10 May 2005 10:07  |
Frank Naude
Messages: 4581
Registered: April 1998
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Senior Member |
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Hi,
Although each instance must have its own thread of redo, they must still reside on share storage. If a node fails, an instance on another node should be able to access these logs to perform instance recovery.
So, put your redo logs on a clustered filesystem, shared raw volumes or shared ASM disks. You can mix and match between these to your heart's content, but don't use local filsystems!
Best regards.
Frank
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| Re: RAC & Redo logs [message #119101 is a reply to message #119097] |
Tue, 10 May 2005 10:25 |
hero
Messages: 5
Registered: May 2005
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Junior Member |
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ok, but if the redos are multiplexed and only one copy
is on local file system, would there be any problem during
instance recovery ? There will be at least one copy available
for recovery.
The reason why I'm asking is: we have one dual raid array,
but in case of its failure, I need to multiplex the
redos somewhere else. buying extra shared storage for this is
expensive.
I've also tried archiving redos using LGWR flag , they're
written on local disk continuously - but what a shame, they are
not usable for DB recovery - I wonder why .
[Updated on: Tue, 10 May 2005 10:31] Report message to a moderator |
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| Re: RAC & Redo logs [message #119242 is a reply to message #119101] |
Wed, 11 May 2005 08:01 |
Frank Naude
Messages: 4581
Registered: April 1998
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Senior Member |
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Theoretically it sounds like it might work. However, since your setup will be pretty unique, I suggest you setup a test environment to certify your config before going life.
Best regards.
Frank
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