excellent storage cost for inactive data, at somewhat lower performance. The technology we describe in this paper, known as HP AutoRAID, automatically and transparently manages migration of data blocks between these two levels as access patterns change. The result is a fully redundant storage system

storage cost for inactive data, at somewhat lower performance. The technology we describe in this pape< known as HP AutoRAID, automatically and transparently manages migration of data blocks between these two levels as access patterns change. The result is a fully-redundant storage system

and hierarchical memory. We discuss several important paradigms for how to solve batched and online problems efficiently in external memory. Programming tools and environments are available for simplifying the programming task. The TPIE system (Transparent Parallel I/O programming Environment) is both easy to use

Over the Internet today, computing and communications environments are significantly more complex and chaotic than classical distributed systems, lacking any centralized organization or hierarchical control. There has been much interest in emerging Peer-to-Peer (P2P) network overlays because

Conventional algorithms for computing large one-dimensional fast Fourier transforms (FFTs), even those algorithms recently developed for vector and parallel computers, are largely unsuitable for systems with external or hierarchical memory. The principal reason for this is the fact that most FFT

Mobile computers such as notebooks, subnotebooks, and palmtops require low weight, low power consumption, and good interactive performance. These requirements impose many challenges on architectures and operating systems. This paper investigates three alternative storage devices for mobile

A scheme based on cryptography is proposed for access control in a system where hierarchy is represented by a partially ordered set (or poset). Straightforward implementation f the scheme requires users highly placed in the hierarchy to store a large number of cryptographic keys. A time-versus-storage

Slow restoration due to chunk fragmentation is a serious problem facing inline chunk-based data deduplication systems: restore speeds for the most recent backup can drop orders of magnitude over the lifetime of a system. We study three techniques—increasing cache size, container capping, and using

In essence, computers are tools to help us with our daily lives. CPUs are extensions to our reasoning capability whereas disks are extensions to our memory. But the simple hierarchical namespace of existing file systems is inadequate in managing files today that have rich semantics. In this paper

with the HP AutoRAID system [Wilkes95], which can dynamically select RAID layout policies based on usage, indicates that both performance and ease-ofuse can be improved by doing so. If a system is to be self-managing, it must be given a set of goals to manage towards. Our approach is to do this in two parts