作者： ANNL CHERVenak , Ken SHIRRIFF , JOHN H HARTMAN , ETHAN L MILLER , Seshan SRINIVASAN
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摘要: In 1989, the RAID (Redundant Arrays of Inexpensive Disks) group at UC Berkeley built a prototype disk array called RAID-I. The bandwidth achieved by RAID-I was severely limited by the memory system bandwidth of the disk array's host workstation. As a result, most of the bandwidth available from the disks could not be delivered to clients of the RAID-I file server. We designed our second prototype, RAID-II, to deliver more of the disk array bandwidth to file server clients. A custom-built crossbar memory system called the XBUS board connects the disks directly to the high-speed network, allowing data for large requests to bypass the server workstation. A single workstation can control several XBUS boards for increased bandwidth. RAID-II runs the Log-Structured File System (LFS) software to optimize performance for bandwidth-intensive applications.