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Only one node seeing shared disk at a time

EXPERT RESPONSE FROM: Brian Peasland

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QUESTION POSED ON: 22 April 2003
I am trying to set up Oracle on a two-node cluster with one shared disk. I cannot use Oracle Real Application clusters because the shared disk was assigned as a primary partition from a SAN and cannot be reassigned as an extended partition or logical partition. I will install the binaries on each node and store the datafiles on the shared disk. The problem is only one node sees the shared disk at a time.

When you start an Oracle database, the instance places locks on each datafile. This prevents other instances from opening those datafiles. This is most likely your problem you are experiencing. The only solution around this is to implement Real Application Clusters (RAC). RAC is the only approved solution for letting multiple instances use the same shared disk files.

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