Abstract

(NASD) storage architecture, prototype implementations oj NASD drives, array management for our architecture, and three,filesystems built on our prototype. NASD provides scal-able storage bandwidth without the cost of servers used primarily,fijr trut&rring data from peripheral networks (e.g. SCSI) to client networks (e.g. ethernet). Increasing datuset 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 cost-#ectively integrated into a next generation disk drive ASK. End-to-end measurements of our prototype drive andfilesys-terns suggest that NASD cun support conventional distrib-uted filesystems without per$ormance degradation. More importantly, we show scaluble bandwidth for NASD-special-ized filesystems. Using a parallel data mining application, NASD drives deliver u linear scaling of 6.2 MB/s per client-drive pair, tested with up to eight pairs in our lab.

Citations