Generally Physical hard disks are used as storage devices.
these physical devices are directly mapped and data is stored on those physical addresses directly.
but when it comes to storage virtualization
SAN etc are used and the storage destination is Logical (or virtual)
storage mapping is done with logical objects
benefits of storage virtualization
Less cost
easy administration (include backup etc)
easy migration of data
Linux administration , Unix administration , Vmware Vsphere administration , Oracle DBA ,apache, backup, dhcp, dns, kvm, xen, kernel, ldap, kvm, monitoring, ticketing, networking, Mail servers, SAN,troubleshooting
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