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IBM z13s Technical Guide by Martin Soellig, John P. Troy, Jin J. Yang, Franco Pinto, Ewerson Palacio, Edzard Hoogerbrug, Cecilia A. De Leon, Barbara Sannerud, Octavian Lascu

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Reliability, availability, and serviceability
This chapter describes the reliability, availability, and serviceability (RAS) features of z13s servers.
The z13s design is focused on providing higher availability by reducing planned and unplanned outages. RAS can be accomplished with improved concurrent replace, repair, and upgrade functions for processors, memory, drawers, and I/O. RAS also extends to the nondisruptive capability for installing Licensed Internal Code (LIC) updates. In most cases, a capacity upgrade can be concurrent without a system ...

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