Availability and Redundancy in Harmony: Measuring Retrieval Times in P2P Storage Systems

Pamies-Juarez, Lluis; Garcı́a-López, Pedro; Sánchez-Artigas, Marc

doi:10.1109/p2p.2010.5570002

Cited by 11 publications

(19 citation statements)

References 22 publications

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“…Intuitively, the availability targeted by the application is the portion of time a backed up data is online for restore. High availability rates have been shown cumbersome to reach in dynamic systems [14], so a reasonable trade-off should be considered [3]. For a backup operation, the client peer uploads the file and the redundancy blocks to other peers as follows:…”

Section: Gateway-assisted Storage Systemmentioning

confidence: 99%

“…Each backup request is supposed to consist in one archive of total size S, that is split into k blocks of individual size s. Redundancy is then added to form n > k blocks of size b, and each block is sent to the gateway of a peer, selected randomly and uniformly among all peers 3 .…”

Section: Model Parametersmentioning

confidence: 99%

“…While cloud backup systems are increasingly adopted by users (e.g., justcloud, SugarSync, Egnyte HybridCloud, Amazon S3 or DropBox), their peer-to-peer alternatives, potentially offering virtually unlimited storage for backup [1,2], are still not appealing enough performance-wise, as e.g. retrieval times for saved data can be an order of magnitude higher that the time required for direct download [3]. A particularly illustrative example is the Wuala case: the Wuala company gained fame by proposing a peer-assisted (advertised as fully peer-to-peer) and practical storage service; nevertheless, this technical choice was abandoned to move to a centralized architecture [4], probably for cost/performance matters.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance evaluation of a peer-to-peer backup system using buffering at the edge

Kermarrec¹,

Merrer²,

Scouarnec³

et al. 2014

Computer Communications

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The availability of end devices of peer-to-peer storage and backup systems has been shown to be critical for usability and for system reliability in practice. This has led to the adoption of hybrid architectures composed of both peers and servers. Such architectures mask the instability of peers thus approaching the performances of client-server systems while providing scalability at a low cost. In this paper, we advocate the replacement of such servers by a cloud of residential gateways, as they are already present in users' homes, thus pushing the required stable components at the edge of the network. In our gateway-assisted system, gateways act as buffers between peers, compensating for their intrinsic instability. We model such a system, for quick dimensioning and estimation of gains. We then evaluate our proposal using statistical distributions based on real world traces, as well as a trace of residential gateways for availability (that we have collected and now make available). Results show that the time required to backup data in the network is substantially improved, as it drops from days to a few hours. As gateways are becoming increasingly powerful in order to enable new services, we expect such a proposal to be leveraged on a short term basis.

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Section: Gateway-assisted Storage Systemmentioning

confidence: 99%

Section: Model Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance evaluation of a peer-to-peer backup system using buffering at the edge

Kermarrec¹,

Merrer²,

Scouarnec³

et al. 2014

Computer Communications

View full text Add to dashboard Cite

show abstract

“…Intuitively, the availability targeted by the application is the portion of time a backed up data is online for restore. High availability rates have been shown cumbersome to reach in dynamic systems [11], so a reasonable trade-off should be considered [3]. For a backup operation, the client peer uploads the file and the redundancy blocks to other peers as follows:…”

Section: Gateway-assisted Storage Systemmentioning

confidence: 99%

“…Amazon S3 or DropBox), their peer-to-peer alternatives, potentially offering virtually unlimited storage for backup [1], [2], are still not appealing enough performance-wise, as e.g. retrieval times for saved data can be an order of magnitude higher that the time required for direct download [3].…”

Section: Introductionmentioning

confidence: 99%

Efficient peer-to-peer backup services through buffering at the edge

Defrance

Kermarrec

Merrer

et al. 2011

2011 IEEE International Conference on Peer-to-Peer Computing

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Efficient peer-to-peer backup services through buffering at the edge Abstract-The availability of end devices of peer-to-peer storage and backup systems has been shown critical for usability and for system reliability in practice. This has led to the adoption of hybrid architectures composed of both peers and servers. Such architectures mask the instability of peers thus approaching the performances of client-server systems while providing scalability at a low cost. In this paper, we advocate the replacement of such servers by a cloud of residential gateways, as they are already present in users' homes, thus pushing the required stable components at the edge of the network. In our gateway-assisted system, gateways act as buffers between peers, compensating for their intrinsic instability. This enables to offload backup tasks quickly from the user's machine to the gateway, while significantly lowering the retrieval time of backed up data. We evaluate our proposal using real world traces including existing traces from Skype and Jabber as well as a trace of residential gateways for availability, and a residential broadband trace for bandwidth. Results show that the time required to backup data in the network is comparable to a server-assisted approach, while substantially improving the time to restore data, which drops from a few days to a few hours. As gateways are becoming increasingly powerful in order to enable new services, we expect such a proposal to be leveraged on a short term basis.

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Flexible replica placement for optimized P2P backup on heterogeneous, unreliable machines

Skowron

Rządca

2015

Concurrency and Computation

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SUMMARYP2P architecture is a viable option for enterprise backup. In contrast to dedicated backup servers, nowadays, a standard solution, making backups directly on organization's workstations should be cheaper as existing hardware is used, more efficient as there is no single bottleneck server, and more reliable as the machines can be geographically dispersed. We present an architecture of a P2P backup system that uses pairwise replication contracts between a data owner and a replicator. In contrast to a standard P2P storage system using directly a distributed hash table (DHT), the contracts allow our system to optimize replicas' placement depending on a specific optimization strategy and so to take advantage of the heterogeneity of the machines and the network. Such optimization is particularly appealing in the context of backup: replicas can be geographically dispersed, the load sent over the network can be minimized, or the optimization goal can be to minimize the backup/restore time. However, managing the contracts, keeping them consistent and adjusting them in response to dynamically changing environment is challenging. We built a scientific prototype and ran experiments on 150 workstations in our university's computer laboratories and, separately, on 50 PlanetLab nodes. We found out that the main factor affecting the performance of the system is the availability of the machines. Yet, our main conclusion is that it is possible to build an efficient and reliable backup system on highly unavailable machines, as our computers had just 13% average availability.

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Availability and Redundancy in Harmony: Measuring Retrieval Times in P2P Storage Systems

Cited by 11 publications

References 22 publications

Performance evaluation of a peer-to-peer backup system using buffering at the edge

Performance evaluation of a peer-to-peer backup system using buffering at the edge

Efficient peer-to-peer backup services through buffering at the edge

Flexible replica placement for optimized P2P backup on heterogeneous, unreliable machines

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