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контекст вместо аскера добавляет старик Гугл. http://met-networks.com/documents/extreme/SummitX450.pdf
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Protected Data and OS for Availability
The Summit X450 series is built with Error Checking and Correcting (ECC) RAM to protect routing tables and continue operation in spite of potentially disruptive
memory events. Furthermore, the system is designed with enough durable flash memory to contain dual OS images as well as two copies of configuration files as an added layer of precaution against potential crippling disruption. перевод - Защищенность данных и ОС для высокой доступности.
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