ABSTRACT This paper describes the Network-Attached Secure Disk

(NASD) storage architecture, prototype implementations of NASD drives, array management for our architecture, and three filesystems built on our prototype. NASD provides scalable storage bandwidth without the cost of servers used primarily for transferring data from peripheral networks (e.g. SCSI) to client networks (e.g. ethernet). Increasing dataset sizes, new attachment technologies, the convergence of peripheral and interprocessor switched networks, and the increased availability of on-drive transistors motivate and enable this new architecture. NASD is based on four main principles: direct transfer to clients, secure interfaces via cryptographic support, asynchronous non-critical-path oversight, and variably-sized data objects. Measurements of our prototype system show that these services can be costeffectively integrated into a next generation disk drive ASIC. End-to-end measurements of our prototype drive and filesystems suggest that NASD can support conventional distributed filesystems without performance degradation. More importantly, we show scalable bandwidth for NASD-specialized filesystems. Using a parallel data mining application, NASD drives deliver a linear scaling of 6.2 MB/s per clientdrive pair, tested with up to eight pairs in our lab