Do all the weblogic application servers need to share storage in order to implement high availability?

I would like to understand if a shared storage is required for all application servers that will run weblogic + oracle identity manager. I've been using the following oracle guides : http://docs.oracle.com/cd/E40329_01/doc.1112/e28391/iam.htm#BABEJGID and http://www.oracle.com/technetwork/database/availability/maa-deployment-blueprint-1735105.pdf and from my interpretation both talk about configuring all the application servers with access to a shared storage. From an architecture standpoint, does this mean all the application servers need access to an external hard disk? if shared storage is required what are the steps to implement it?
Thanks,
user12107187

You can do it and it will work. But Fusion Middleware products have EDG to provide guidelines to help you to implement high availability.
Having a shared storage will help you to recover from storage failure, otherwise this might be a point of failure.
Enterprise Deployment Overview
"An Oracle Fusion Middleware enterprise deployment:
Considers various business service level agreements (SLA) to make high-availability best practices as widely applicable as possible
Leverages database grid servers and storage grid with low-cost storage to provide highly resilient, lower cost infrastructure
Uses results from extensive performance impact studies for different configurations to ensure that the high-availability architecture is optimally configured to perform and scale to business needs
Enables control over the length of time to recover from an outage and the amount of acceptable data loss from a natural disaster
Evolves with each Oracle version and is completely independent of hardware and operating system "
Best Regards
Luz

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