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|Oracle Solaris ZFS Administration Guide Oracle Solaris 10 8/11 Information Library|
As described in ZFS Pooled Storage, ZFS eliminates the need for a separate volume manager. ZFS operates on raw devices, so it is possible to create a storage pool comprised of logical volumes, either software or hardware. This configuration is not recommended, as ZFS works best when it uses raw physical devices. Using logical volumes might sacrifice performance, reliability, or both, and should be avoided.