NSDI '06 — Abstract
Pp. 367–380 of the Proceedings
Olive: Distributed Point-in-Time Branching Storage for Real
Systems
Marcos K. Aguilera, Susan Spence, and Alistair Veitch, Hewlett-Packard Laboratories, Palo Alto
Abstract
This paper describes Olive, the first distributed
block storage system to provide consistent point-in-time branching. Point-in-time branching allows users
to recursively and quickly snapshot or clone the storage
state. It has a wide range of applications including testing
new deployments or upgrades without disrupting a
running system, quickly provisioning large homogeneous
systems, and preserving old versions of data. Olive provides
block-level access and strong consistency for broad
applicability, allowing it to branch file systems, database
systems, and every other storage application that ultimately
stores data on block storage. Olive is distributed
and replicated to provide fault tolerance and availability.
Providing strong consistency for branching in a replicated
distributed system is a technical challenge that we address
in this work. We evaluate Olive and show that branching
typically takes a few tens of milliseconds, and so it has
little impact on I/O's.
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