importance of inventory management
In Chapter 2 we discussed how disk subsystems implement a whole range of measures to
increase their own fault-tolerance. Nevertheless, disk subsystems can sometimes fail, for
example in the event of physical impairments such as fire or water damage or due to faults
that should not happen at all according to the manufacturer. The only thing that helps in
the event of faults in the disk subsystem is to mirror the data on two disk subsystems.
Mirroring (RAID 1) is a form of virtualisation, for which various realisation locations
were discussed in importance of inventory management. In contrast to classical RAID 1 within the disk subsystem
for protection against its failure, the data is mirrored on two different disk subsystems,
which are wherever possible separated by a fire protection wall and connected to two
independent electric circuits. From the point of view of reducing the load on the server,
the realisation of the mirroring by the disk subsystem in the form of remote mirroring is
optimal.
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