Sandeep Uttamchandani

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Effectiveness and tradeoffs of deduplication technologies are not well understood -- vendors tout Deduplication as a "silver bullet" that can help any enterprise optimize its deployed storage capacity. This paper aims to provide a comprehensive taxonomy and experimental evaluation using real-world data. While the rate of change of data on a day-to-day basis(More)
Server Flash Cache (SFC) is increasingly adopted in virtualization environments for IO acceleration. Deciding the optimal SFC allocation among VMs or VM disks is a major pain-point, dominantly handled manually by administrators. In this paper, we present vCacheShare, a dynamic, workload-aware, policy-driven framework for continuous and automated(More)
The effectiveness of automatic storage management depends on the accuracy of the storage performance models that are used for making resource allocation decisions. Several approaches have been proposed for modeling. Black-box approaches are the most promising in real-world storage systems because they require minimal device specific information, and are(More)
Modern storage systems are employing data deduplication with increasing frequency. Often the storage systems on which these techniques are deployed contain important data, and utilize fault-tolerant hardware and software to improve the reliability of the system and reduce data loss. We suggest that data deduplication introduces inter-file relationships that(More)
We present DIADS, an integrated DIAgnosis tool for Databases and Storage area networks (SANs). Existing diagnosis tools in this domain have a database-only (e.g., [11]) or SAN-only (e.g., [28]) focus. DIADS is a firstof-a-kind framework based on a careful integration of information from the database and SAN subsystems; and is not a simple concatenation of(More)
We present the design and implementation of ENDEAVOUR - a framework for integrated end-to-end disaster recovery (DR) planning. Unlike existing research that provides DR planning within a single layer of the IT stack (e.g. storage controller based replication), ENDEAVOUR can choose technologies and composition of technologies across multiple layers like(More)
Enterprise applications typically depend on guaranteed performance from the storage subsystem, lest they fail. However, unregulated competition is unlikely to result in a fair, predictable apportioning of resources. Given that widespread access protocols and scheduling policies are largely best-effort, the problem of providing performance guarantees on a(More)
Enterprise applications typically depend on guaranteed performance from the storage subsystem, lest they fail. However, changes in the workload characteristics, component failures, load surges, are unlikely to result in guaranteed performance for the applications. Given that widespread access protocols and scheduling policies are largely best-effort, the(More)