User's Guide

27
By default, the fan units are of the N+1 redundancy with the specified number of mounted devices. For
example, when 16 CPU blades are mounted, the specified number of mounted fan units are eight. Even
when one of the fan units is faulty and seven other are normal, the normal, continuous operation is
available. When two of the fan units are in faulty, however, CPU blades and switch modules may detect
temperature anomaly and may halt.
* When, for example, mounting only one NEC Express5800/12Bb-M6, this device occupies the
CPU blade slots 1 and 2. Although there is nothing mounted in the CPU blade slot nine, six
fan units are required, as the status of CPU blade slot 2 is preferred.
* Mount the fan units in the proper positions according to the criteria described on the previous
page.
* For information on the number of slots used by blade products, see "Installable CPU blades" a
nd user's guides of blades.