Storage virtualization is the pooling of physical storage from multiple network storage devices into what appears to be a single storage device that is managed from a central console
2. STORAGE VIRTUALIZATION
• Storage virtualization is the pooling of physical storage from multiple
network storage devices into what appears to be a single storage device
that is managed from a central console.
• Storage virtualization helps the storage administrator perform the tasks of
backup, archiving, and recovery more easily -- and in less time -- by
disguising the actual complexity of a storage area network.
• Administrators can implement virtualization with software applications or
by using hardware and software hybrid appliances.
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3. TYPES OF STORAGE VIRTUALIZATION
• Basically there are 3 levels in storage network where virtualization can be
performed:
• Storage virtualisation in the server
• Storage virtualisation in storage devices
• Storage virtualisation in the network
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4. STORAGE VIRTUALISATION IN STORAGE
DEVICES
• Storage virtualization is the process of presenting a logical view of the
physical storage resources to a host.
• This logical storage appears and behaves as physical storage directly
connected to the host.
• Throughout the evolution of storage technology, some form of storage
virtualization has been implemented.
• Some examples of storage virtualization are host-based volume
management, LUN creation, tape storage virtualization, and disk
addressing.
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6. ADVANTAGES
• The majority of the administration takes place directly upon the storage device,
which is currently perceived as easier and more reliable since it takes place
very close to the physical devices.
• Advanced storage functions such as RAID and instant copies are realised
directly at the physical storage resources, meaning that servers and I/O buses
are not loaded.
• The uncoupling of the servers additionally eases the work in heterogeneous
environments since a storage device is able to make storage available to
various platforms.
• The servers are not placed under additional load by virtualisation operations.
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7. DISADVANTAGES
• Configuration and implementation of virtualisation are manufacturer-
specific and may thus become a proprietary solution in the event of certain
incompatibilities with other storage devices.
• It is very difficult – and sometimes even impossible – to get storage devices
from different manufacturers to work together.
• Here too, virtualisation takes place only within a storage system and
cannot effectively be expanded to include several such storage devices
without additional server software.
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