@device(postscript)
@libraryfile(Mathematics10)
@libraryfile(Accents)
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@pagefooting(immediate, left "@c<Technical Report 1996>",
center "@c<Computer Science>",
right "@c<Carnegie Mellon>")
@heading(A Case for Network-Attached Secure Disks)
@heading(CMU-CS-96-142)
@center(@b(Garth A. Gibson, David F. Nagle, Khalil Amiri, Fay W. Chang,
Eugene Feinberg, Howard Gobioff, Chen Lee, Berend Ozceri, Erik Riedel, 
David Rochberg))
@center(September 1996)
@center(FTP: CMU-CS-96-142.ps)
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@begin(text)

By providing direct data transfer between storage and client,
network-attached storage devices have the potential to improve
scalability (by removing the server as a bottleneck) and perfor mance
(through network striping and shorter data paths). Realizing the
technology's full potential requires careful consideration across a
wide range of file system, networking and security issues.  To address
these issues, this paper presents two new network-attached storage
architectures. (1) Networked SCSI disks (NetSCSI) are network-attached
storage devices with minimal changes from the familiar SCSI interface
(2) Network-attached secure disks (NASD) are drives that sup port
independent client access to drive provided object services. For both
architectures, we present a sketch of repartitionings of distributed
file system functionality, including a security framework whose
strongest levels use tamper-resistant processing in the disks to
provide action authorization and data privacy even when the drive is
in an physically insecure location.  Using AFS and NFS traces to
evaluate each architecture's potential to decrease file server work
load, our results suggest that NetSCSI can reduce file server load
during a burst of AFS activity by a factor of about 2; for the NASD
architecture, server load (during burst activity) can be reduced by a
factor of about 4 for AFS and 10 for NFS.

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@begin(transparent,size=10)
@b(Keywords:@ )@c<File system management, access controls, special-purpose
and application-based systems>
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@end(text)
@flushright(@b[(19 pages)])