存储虚拟化课件.pptVIP

* * * * * * * * Storage virtualization typically comes in two configurations: In-Band and Out-of-Band. In an Out-of-Band configuration, the virtualized environment configuration is stored externally to the data path and typically allows the environment to process data at line speed, with only minimal latency added for translation of the virtual configuration to the physical storage. Data is not cached, beyond what would normally occur in a typical SAN configuration. Because the switches are hardware based and optimized for fiber channel communications, they can be scaled significantly. Also, because only the data is included in the solution, many of the existing array features and functions continue to be utilized, in addition to new features offered by the virtualization solution. An In-Band configuration is placed directly in the data path. This is typically done with general-purpose servers or appliances, which function as the translation engine from the virtual configuration to the physical storage. Because this is typically a software implementation, the performance levels are not as high as an out-of-band solution and there is generally additional latency injected into the environment. Data is often cached on the device and then forwarded as processing cycles allow. This results in state occurring with data existing in the network for some time before being committed to disk, as opposed to an out-of-band solution that writes to disk after passing through the virtualization device. * * * * VERITAS Confidential * * * * Increase Utilization - Adopt a holistic Storage Resource Management Solution The first step in enabling organizations to reduce storage costs is to provide end-to-end visibility into the storage stack. This requires a Storage Resource Management (SRM) solution that bridges the physical network and virtual resources with the logical data (applications and file data), providing a single, holistic view into the storage environment regardles