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SAP Planning: Best Practices in Implementation by George W. Anderson

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Single Points of Failure Inherent in the OS

When it comes to the operating system running on a server, HA often equates to

  • An ability to software-mirror critical volumes or partitions, for example, through HP’s MirrorDisk/UX or Windows Disk Administrator (though the latter is not normally seen much nor recommended for production systems)

  • A highly available file system that supports redundant file allocation tables or similar structures

  • An ability to apply changes or patches “on the fly” or in another manner that minimizes downtime

  • Protecting the NFS server, in the case of UNIX-based solutions, where the NFS server represents a single point of failure. Therefore, the UNIX OS must support a high-availability option like clustering the NFS server. ...

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