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can anyone explain me about ocr, voting disks in oracle

Posted on 2009-04-25
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can anyone explain me about ocr, voting disks in oracle . Thank you. please also provide  me about good links where i can get to know more about these...
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Question by:saravanan_k
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k_murli_krishna earned 600 total points
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by:sventhan
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The OCR is a file on the shared cluster filesystem or a shared raw device file (not on ASM). The Oracle Cluster Registry (OCR) contains cluster and database configuration information for Cluster Ready Services (CRS), including the list of nodes in the cluster database, the CRS application, resource profiles, and the authorizations for
the Event Manager (EVM).
SVRCTL commands affects the state information
in this Registry.
 
The Voting Disk File is a file on the shared cluster filesystem or a shared raw device file (not on ASM). Voting disk is akin to the quorum disk, which helps to avoid the split-brain syndrome. The voting disk records node membership information. A node must be able to access more than half of the voting disks at any time.
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by:garysadler
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The voting disk and quorum disk are one and the same.  The voting disk was called the "quorum" disk in Oracle9i RAC.  I don't get why Oracle like to change the names of things, but I suppose we can think of it as job security.  :-)

sventhan:  I'm not sure what you mean by "A node must be able to access mor ethan half of the voting disks at any time".  There is one voting disk per cluster, although it is typically mirrored for the sake of redundancy.  

One important thing to note is that the OCR is backed up automatically but the voting disk is not.  It is necessary to implement a separate script to backup the voting disk on a regular basis.
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by:sventhan
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Oracle 10gR1 supports only one voting disk, but R2 supports upto 32 voting disks. By having muliple voting disks elimiates the voting disk as a single point of failure and eliminates the need to mirror them outside oracle.
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by:garysadler
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Well, to be precise, R2 supports up to 32 *copies* of *the* voting disk.  The same thing can be accomplished outside of Oracle by mirroring the shared storage.
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