Is it possible to virtualize backup servers? Doesn't seem to be a popular approach; why is that?
Technically, there is nothing stopping someone from virtualizing a backup server, but doing so might not be the best idea. Backup servers typically require a great deal of network bandwidth and fast disk I/O performance. In a virtualized environment, the backup server may not receive adequate CPU and disk I/O resources, or it could rob other virtualized servers of these resources.
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If an organization does choose to virtualize backup servers, then it should use dedicated NICs for the backup servers, and it should make use of pass-through disks (or a virtual SAN) for the storage pool, instead of relying on virtual hard disks.
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