OSDI 2000 Abstract
Interposed Request Routing for Scalable Network Storage
Darrell C. Anderson, Jeffrey S. Chase, and Amin M. Vahdat, Duke University
This paper explores interposed request
routing in Slice, a new storage system architecture for high-speed networks incorporating network-
attached block storage. Slice interposes a request
switching filter called a µproxy along each
client's network path to the storage service (e.g.,
in a network adapter or switch). The µproxy intercepts request traffic and distributes it across a server
ensemble. We propose request routing schemes for
I/O and file service traffic, and explore their effect
on service structure.
The Slice prototype uses a packet lter µproxy
to virtualize the standard Network File System
(NFS) protocol, presenting to NFS clients a unified shared file volume with scalable bandwidth and
capacity. Experimental results from the industry-
standard SPECsfs97 workload demonstrate that
the architecture enables construction of powerful
network-attached storage services by aggregating
cost-effective components on a switched Gigabit
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