Expert Oracle Exadata - Parent Directory

CHAPTER 8 CONFIGURING EXADATA Note: The way OneCommand assigns IP addresses sequentially from a base address can be problematic whenadding compute nodes and storage cells to your configuration. We’ll talk more about this later in the chapter whenwe look at upgrading Exadata.Disk Type: This field is presented as a drop-down list. Exadata X2 models comein two flavors, High Capacity Disks and High Performance Disks. High-capacitydisks have a capacity of 2 terabytes, while high performance disks have acapacity of 600 gigabytes. This information is used to calculate cell disk and griddisk sizes for the installation.Workload Type: Several settings from the configuration worksheet are used tocreate a starter database during the installation process. These parameters areused to create a database template that is in turn used by the DatabaseConfiguration Assistant (dbca) at the end of the installation process. Theworkload type you specify determines whether your default database isoptimized for OLTP or DW workloads. Instance parameters such as SGA_TARGETand PGA_TARGET are sized based on the Workload Type you specified for yourdatabase.Backup Method: This setting determines how your disk groups are sized duringthe installation process. Disk space is allocated to the DATA and RECO disk groupsas follows:Backups Internal to Exadata: If you plan to use the Fast Recovery Area(FRA) to store online database backups, choose Backups Internal toOracle. When this allocation scheme is selected, disk space for the DATAand RECO disk groups will be allocated as follows:DATA: 40%RECO: 60%Backups External to Exadata: If you are planning to back up yourdatabases directly to tape, NFS, or some other storage external toExadata, choose Backups External to Exadata. When this allocationscheme is chosen, disk space will be allocated to the DATA and RECO diskgroups as follows:DATA: 80%RECO: 20%Protection Level: This determines what level of redundancy will be configuredfor your ASM disk groups, DATA and RECO. Similar to the Type of System field,this field is presented as a drop-down list from which you can choose theredundancy for your disk groups. Keep in mind that normal redundancy halvesthe usable space in your disk groups. Normal redundancy is the minimumallowable redundancy level. High redundancy provides the best protectionfrom disk and storage cell failures, but it does so at the cost of reducingavailable space by two thirds. The following combinations are supported:245