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Xsan 为Mac OS X量身定做的SAN文件系统
用 Xsan 这款绝对经济的企业级存储区域网络（SAN）解决方案来扩展你的网络。Xsan 允许多台计算机通过高速光纤通道同时访问 Xserve RAID 中存储的 TB 甚至 PB 容量数据。
高性能的存储网络
Xsan 充分利用了 Mac OS X v10.4 "Tiger" 中强大的 64 位文件系统，让你公司里的用户能共享 2PB 的文件容量。SAN 上的数十个系统可同时读写共享的存储内容，这点与其它限制容量的解决方案截然不同。更让人叫绝的是，SAN 可跨越多种 RAID 设备进行数据汇集，从而表现出更高的性能，所有用户都能访问这些集中后的数据，就好像与这些数据直接联络通信一样。由于直接将用户连接到高速光纤通道网络，Xsan 无需再通过使用以太网技术的网络进行缓慢的文件传输了。由于使用了多路光纤通道，即通过两条光纤通道将一台计算机连接到 SAN 的方式，从理论上来讲，每位 Xsan 用户可以获得高达 400MBps 的吞吐量，这对从事视频项目或计算机集群等对高速数据访问需求颇高的各行业编辑人员来说是完美的选择，这种方法能确保每个节点都以满负荷进行运作。
至关重要的冗余
Xsan 具有高度可及的特点，能够避免潜在的单点故障，因此可将这种高性能的存储网络用于企业网络合并及替换基于网络的存储（NAS）项目。Xsan使用一种叫作元数据控制器的系统与SAN相连接，以管理对共享存储区域的访问。如果控制器因故障运行失败，Xsan 会自动选择SAN上的另一台计算机来替代前者的角色。替换出错的元数据控制器，就能确保只要SAN上有一个活动的计算机系统，你就可以访问共享数据。当遇到电缆上没有任何活动计算机的情况时，Xsan 会通过双端口 Apple 光纤通道 HBA 上的第二根电缆以多路径的方式自动路由至系统。在执行关键的操作时，可以清除 SAN 上为方便其它系统使用 Xsan 带宽而保留的一条路径。
轻松组建、轻松管理
正如你对 Apple 服务器和存储产品的期望那样，Xsan 同样包含了方便可及的工具，让你可以在网络上的任何地方轻松管理SAN。 Xsan Admin 可帮助你从存储的资源中得到最多的信息，包括用户配额和组配额等，并实现让相关的文件、文件夹与特殊的存储级别互相关联。正如拥有 Xserve RAID 一样，你可以远程监管系统的性能，或让 Xsan 通过电子邮件或寻呼机通知你发生的新情况。
让网络称心如意
全新的 Xsan Tuner 应用软件可用于测试存储区域网络内的数据、视频传输能力及 Xsan 容量。Xsan Tuner 能够模拟标准的UNIX 读写及 Final Cut Pro 视频读写，可满足各种通用视频格式的需求。投入生产使用前，还可使用 Xsan Tuner 观察 SAN 是否能完成计划的工作负荷处理。下载 Xsan Tuning Guide，以进一步理解 Xsan Tuner 的强大功能，并查看有关SAN性能优化的建议。
可与多种系统和睦相处
在 Mac Pro 、Xserve 和 Xserve RAID 上， 你可以放心地使用大多数 Mac OS X和Mac OS X Server软件，包括苹果电脑公司的 Final Cut Studio等。 在配置Xsan时，你需要一个质量过硬的 第三方光纤通道交换机。此外，在包含 Windows、UNIX 和 Linux 的跨平台环境中亦可使用Xsan，只需安装 ADIC StorNext 文件系统即可，该系统与 Xsan 完全兼容。当然，Xsan 还可以同 ADIC 的 Scakar 系列磁带库及策略性的数据管理工具默契合作，这样就能大大减少信息生命周期的管理 成本。
绝无潜在费用
一项最优秀的特点，Xsan在提供这些卓越的性能、灵活性和使用简便性的同时，其价格毫不含糊。只需把Xsan安装到对其支持的计算机上，将其作为元数据控制器或文件系统用户添加到SAN上即可。与其它一些厂家不同，苹果电脑公司绝不会因为你向SAN中添加了更多的存储设备而收取额外的费用。只需插上另一个Xserve RAID或Apple驱动模块，就能立刻拥有更多的SAN存储空间。Xsan提供了先进的存储网络，而其价格仅为同类竞争者的一小部分。
Expand your network horizons with Xsan, an enterprise-class storage area network (SAN) solution that’s surprisingly affordable. Xsan lets multiple computers concurrently access terabytes — even petabytes — of storage on Xserve RAID over high-speed Fibre Channel. Order Xsan today for $999 per node.
High-performance storage networking
Xsan takes advantage of the 64-bit file system in Mac OS X v10.4 “Tiger” — so users in your organization can share files and volumes up to two petabytes (2PB) in size. Dozens of systems on the SAN can read and write to shared storage simultaneously, unlike other solutions which gate access at the volume level. Even better, using a SAN lets you pool data across multiple RAID devices for better performance, while each client can access this centralized data as if connected directly to it. And by connecting users directly to a high-speed Fibre Channel network, Xsan eliminates the need to transfer files over slower Ethernet-based networks. Using Fibre Channel multipathing, in which two Fibre Channel cables connect a computer to the SAN, an Xsan client can theoretically achieve throughput of up to 400MBps, perfect for multiple editors working on a video project or a compute cluster that needs fast access to data to ensure each node crunches at full capacity.
Mission-Critical Redundancy
Xsan includes high-availability features to eliminate potential single points of failure, so you can use high-performance storage networking for enterprise consolidation and network-attached storage (NAS) replacement projects. Xsan uses one system connected to the SAN, called a metadata controller, to manage access to shared storage. If this machine fails for any reason, Xsan picks another computer on the SAN to take over this role. Cascading metadata controller failover ensures that you can access your data as long as any one system on your SAN is active. In the event of a loose cable, Xsan uses multipathing to automatically route traffic to the system through a second cable on dual-port Apple Fibre Channel HBA. And during critical operations, you can clear a path on your SAN for any system using Xsan bandwidth reservation.
Easy to Set Up, Easy to Manage
As you’d expect from Apple server and storage products, Xsan includes accessible tools to administer your SAN anywhere on the network. Xsan Admin helps you get the most from your storage resources with user and group quotas, as well as affinities to associate files and folders with specific classes of storage. As with Xserve RAID, you can monitor performance remotely or let Xsan notify you of events via email or pager.
Keep Your Network in Tune
Use the new Xsan Tuner application to test the data and video transfer capabilities of your storage area network and its Xsan volumes. Xsan Tuner can simulate both standard UNIX reads and writes, as well as Final Cut Pro video reads and writes for a variety of common video formats. You can also use the Xsan Tuner to see if your SAN can handle planned workloads — before you put it into production use. Download the Xsan Tuning Guide to help you understand the Xsan Tuner results, as well as for suggestions for optimizing your SAN performance.
Plays Well With Others
Xsan delivers incredible performance on Mac Pro, Xserve and Xserve RAID. You can use most Mac OS X and Mac OS X server software, including Apple’s Final Cut Studio. To deploy Xsan, you will need a qualified third-party Fibre Channel switch. You may also use Xsan in a cross-platform environment alongside Windows-, UNIX- and Linux-based systems, using the ADIC StorNext File System, which is 100% interoperable with Xsan. Xsan also works well with ADIC’s Scalar line of tape libraries and policy-based data management tools to reduce your information lifecycle management costs.
No Hidden Costs
Best of all, Xsan delivers this incredible performance, flexibility and ease of use without a confusing pricing structure. Simply install Xsan on a supported machine to add it to your SAN as metadata controller or file system client. Unlike some vendors, Apple doesn’t charge more when you add additional storage to your SAN. Just plug in another Xserve RAID or Apple Drive Module to add more SAN capacity. Xsan offers advanced storage networking at a fraction of the price of competitors.