This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "". The branch, master has been updated via 9520c8c3f9ce6a1b0b16143885c900e7cc26fba8 (commit) from d53faf48f19b37896d0c5743d4b60586e528dd12 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit 9520c8c3f9ce6a1b0b16143885c900e7cc26fba8 Author: Phil Carns <[email protected]> Date: Mon Oct 29 15:37:06 2012 -0400 edit system parameters and add citations ----------------------------------------------------------------------- Summary of changes: .../simulation-2012-10/simulation-2012-10.txt | 24 ++++++++++++------- 1 files changed, 15 insertions(+), 9 deletions(-) Diff of changes: diff --git a/code/doc/resilience/simulation-2012-10/simulation-2012-10.txt b/code/doc/resilience/simulation-2012-10/simulation-2012-10.txt index e45d1be..71558f3 100644 --- a/code/doc/resilience/simulation-2012-10/simulation-2012-10.txt +++ b/code/doc/resilience/simulation-2012-10/simulation-2012-10.txt @@ -279,21 +279,22 @@ system in the Triton ROSS simulation: * disk latency: 2.5 millisecond * number of servers: 768 -In this study we set the network bandwidth and latency of each server +We set the network bandwidth and latency of each server to 100 Gib/s and 1 microsecond, respectively, to reflect the advertised -bandwidth of the most recent generation of FDR InfiniBand adapters. -TODO: cite Mellanox. We also set the disk bandwidth to 100 Gib/s in +bandwidth of the most recent generation of FDR InfiniBand adapters +<<Mellanox>>. We also set the disk bandwidth to 100 Gib/s in order to model storage nodes with balanced network and storage performance. This node configuration would likely include a large array of high density -2.5" drives and rack-mount enclosures. TODO: cite Seagate and SuperMicro. +2.5" drives <<Seagate>> and rack-mount enclosures <<SuperMicro>>. The corresponding average seek time for enterprise-class 2.5" hard drives is approximately 2.5 milliseconds. Our model does not simulate storage with -individual hard disk granularity. We instead use a single disk bandwidth -parameter to represent the aggregate rate of an entire hard drive array. +individual hard disk granularity; we instead use a single disk bandwidth +parameter to represent the aggregate rate of an entire locally attached +hard drive array. Finally, we set the total number of servers to 768. This allows for files -to be striped across 128 objects using 3-way replication with no overlap of -objects on a server. Unless otherwise noted, all experiments in this report +to be striped across 256 objects using 3-way replication with no overlap of +objects on any server. Unless otherwise noted, all experiments in this report were performed with a replication factor of 3 for all objects. This example configuration would have a total raw capacity of @@ -301,7 +302,6 @@ approximately 40 PiB and a total theoretical throughput of 9 TiB/s using currently available technology. The peak achievable throughput of such a system is likely to be much lower in practice, but these figures give us a starting point for large our large-scale simulation experiments. - In future work we will model not only present day configurations, but also projected systems using technology that will be available within the next five years. @@ -543,4 +543,10 @@ of erasure coding for quiescent data. (1999). "Efficient optimistic parallel simulations using reverse computation". ACM Transactions on Modeling and Computer Simulation (Association for Computing Machinery) 9 (3): 224–253. +- [[[Mellanox]]] Mellanox Connect-IB InfiniBand host channel adapter cards. + http://www.mellanox.com. 2012. +- [[[Seagate]]] Seagate Savvio 10K hard drive. http://www.seagate.com. + 2012. +- [[[SuperMicro]]] SuperMicro SC417E16 series chasis. + http://www.supermicro.com. hooks/post-receive --