Exadata Storage Architecture

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 In this blog of the Exadata Storage Architecture is presented.  For ease of complexity this diagram represents an Exadata Quarter Rack.  The full Exadata 8 Node Rack has 14 Cells and 168 disks or 4x of what is shown in the diagram.   What is shown is the relationship between the compute nodes (database servers), InfiniBand switches, and storage servers.

 

Quarter Rack

Each storage server has physical disks that are configured for use by ASM.   The following shows the relationship between physical disks, cell disks, and grid disks


Next is a representation of what the cell disks look like when configured according to the default installation on Exadata.  This shows the first 3 disks, followed by disk “n” which represents the remaining disks




On each cell, the first 2 disks have approximately 30GB sectioned off for the operating system.  The corresponding space on the remaining disks is used to create the DBFS_DG grid disks.  Finally, a grid disk for DATA is created (starting from the outside tracks for the best performance), followed by the RECO grid disk

Database File System (DBFS)

Database File System (DBFS) is a filesystem stored in a database. Best practice is to use a dedicated DBFS database. DBFS can be shared between all Exadata compute nodes. DBFS cannot be exported via NFS.

You can learn in detail on Exadata from book Expert Oracle Exadata

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Please check our other blogs for Exadata. 

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