Cheyenne Hierarchical Storage Management (HSM) for UNIX optimizes your storage resources by automatically and dynamically assigning data to the most efficient storage media. An HSM strategy might provide a hard drive on primary servers to provide high performance for frequently accessed data. Secondary storage, an optical jukebox, could be used for slightly less frequently accessed data. Client data migration is also available through the optical jukebox through the server. Cheyenne HSM is available at the client, workgroup and enterprise levels for a wide range of storage-intensive applications, from image processing and design automation (CAD/AEC/GIS) to Computer-Aided Software Engineering (CASE) and multimedia databases. Cheyenne HSM provides full functionality network storage management including automatic file migration, library management and high-speed backup. Files are migrated transparently between magnetic disk and optical disk libraries to maximize performance, capacity, cost-effectiveness and ease of administration.
The self-loading software installs in minutes, and parameters are easily adjustable to optimize both data storage resources and overall system performance. With Cheyenne HSMÆs automatic file migration system, the network administrator can "set it and forget it." Cheyenne HSM manages your data transparently and automatically as a file system rather than as a device. The file system "sees and accesses" all files, even those stored on optical devices, as if they reside on the magnetic device. As a result, users require no training or other special procedures to access files stored anywhere on the system.
Cheyenne HSM tracks the activity level of each file. A magnetic disk serves as the active storage and contains files most recently created or accessed. When the volume of data on the drive reaches a user-determined percentage of capacity, the least frequently accessed files are automatically moved to optical storage. The file name remains in the directory located on the hard disk. Cheyenne HSM is available for file servers and for clients on the network.
The data capacity of an optical disk can present a barrier for particularly large files or data sets. Cheyenne HSM software overcomes this limitation by spanning the file across multiple disks, supporting file sizes limited only by your operating system.
Many optical storage systems are based on architectures that have a single point of failure. As a result, optical storage data is dependent on the integrity of the magnetic media. If the hard drive goes down, the optical subsystem is rendered useless. The single point-of-failure architecture is unacceptable for today's mission - critical UNIX environments. Cheyenne HSM writes the file lookup tables to the optical disks, in standard UFS format. In the event of hard disk failure, directories and nodes that point to data stored on a optical device can be reconstructed from information residing on that disk.
Cheyenne HSM operates on single and multiprocessor platforms from Sun Microsystems. Cheyenne HSM supports both UNIX-based workstations and DOS-based personal computers, using NFS, FTP, and other standard UNIX protocols.
The optical disk used by Cheyenne HSM is ISO compliant and the data is recorded in the standard UFS format, which means that your data can be read by any ISO conforming drive, using the appropriate UNIX operating system. As a result, your media (and data) is liberated from the constraints of a single piece of hardware, allowing you to design and implement a distributed network storage solution in complete confidence, scaled to the needs of each workgroup. Cheyenne HSM thus offers both a "front door" and "back door" to your optical libraries.
In a fully integrated UNIX-based network storage subsystem, files are accessed in the same manner as any other standard UNIX file system. The physical location of the files remains transparent to both the user and other file management software operating on the server. If the file is located on optical, the software locates it using a file directory maintained on magnetic, mounts the appropriate optical disk and retrieves the data, making it available to the user even as the file is being transferred to the hard disk. Retrieval from optical disks typically requires from five to fifteen seconds. An optical file remains unchanged until it is modified on the hard disk.
Hardware: Sun SPARC System
Storage: 20 MB
Memory: 16 MB
Operating System: Solaris 2.3
Includes: 8mm media
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