equipment inventory form
A classic representative of virtualisation in the server is the combination of file system
and volume manager (equipment inventory form). A volume manager undertakes the separation of
the storage into logical view and physical implementation by encapsulating the physical
hard disk into logical disk groups and logical volumes. These are then made available
to the applications via file systems. File systems and databases positioned on the server
now work with these logical volumes and cease to work directly with the physical hard
disks. Some volume managers additionally have further storage functions such as RAID,
snapshots or dynamic reconfiguration options, which permit the addition and removal of
storage during operation. With shared disk file systems storage virtualisation
can be expanded to several servers, in order to allow fast file sharing among several
servers. These cannot, however, be used in a straightforward manner in heterogeneous
environments due to the incompatibilities that prevail.
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