Tag Archives: OLR

Wanna clone Oracle, just copy it

Hey. Hypothetical situation. You have freshly installed OS Linux, and you wanna install Oracle GRID+RDBMS there. But you have another server with has already installed Oracle. All you need it’s just copy Oracle homes, and do couple steps.

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Chicken-and-egg problem

You might wonder how CSSD, which is required to start the clustered ASM instance, can be started if voting disks are stored in ASM? This sound like a chicken-and-egg problem. Without access to the voting disks there is no CSS, hence the node can’t join the cluster. But without begin part of the cluster, CSSD can’t start the ASM instance. To solve this problem the ASM disk headers have metadata since 11.2. You can use kfed to read the headers of ASM disks containing a voting disk. The kfdhdb.vfstart and kfdhdb.vfend fields tell CSS where to find the voting file. This does not require the ASM instance to be up. Once the voting disks are located, CSS can access them and joins the cluster.