2.2. Determining the required number of disks and controllers
In the previous section, we covered the process of measuring, or estimating, the number of database disk reads and writes generated by an application per second. In this section, we'll cover the formula used to estimate the number of disks required to design a storage system capable of handling the expected application I/O load.
Note that the calculations presented in this section are geared toward direct-attached storage (DAS) solutions using traditional RAID storage. Configuring SAN-based Virtualized RAID (V-RAID) storage is a specialist skill, and one that differs among various SAN solutions and vendors. Therefore, use the calculations presented here as a rough guideline only. ...
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