Attached disks rely on the Azure Blob storage service. Each standard disk is capable of a theoretical maximum of approximately 500 input/output operations per second (IOPS). Our premium disk offering is preferred for high-performance database workloads and can achieve up to 5000 IOps per disk. You can use a single disk if that meets your performance needs. However, you can improve the effective IOPS performance if you use multiple attached disks, spread database data across them, and then use Oracle Automatic Storage Management (ASM). See [Oracle Automatic Storage overview](https://www.oracle.com/technetwork/database/index-100339.html) for more Oracle ASM specific information. For an example of how to install and configure Oracle ASM on a Linux Azure VM, see the [Installing and Configuring Oracle Automated Storage Management](configure-oracle-asm.md) tutorial.
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