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---+ Local Grid Bonding ---++ General DPM performance issues The data that can be read/written from a disk pool node is limited by several factors: * the speed that data can be read/written from DPM disk areas. This is limited by the method of connection of the disk devices, which in our case is via dual SCSI each at 320 MBytes/sec. * the speed that data can pass through the network between client and server. This is affected by number and speed of network interfaces, and the network switch setup. * in both these aspects, there is contention between the different clients accessing the SE or pool nodes simultaneously. Each receive a share of the available bandwidth. This favours a setup where there are multiple disk pool nodes, either each exclusively handling a reasonably small quantity of data, or each able to have uncontended access to all the storage. * There is also contention within a worker node, between the different clients (eg rfcp) on the same node. These share the same WN network interface(s). ---++ Implementing network bonding I've implemented [[http://en.wikipedia.org/wiki/Channel_bonding][network bonding]] on the disk pool node epgsr1, in order to help with a bottleneck which became clear during the running of STEP 09. ---+++ Switch Setup ---+++ Pool node Setup -- Main.LawrenceLowe - 11 Jun 2009
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Topic revision: r2 - 11 Jun 2009
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_47C_61UK_47O_61eScience_47OU_61Birmingham_47L_61ParticlePhysics_47CN_61christopher_32curtis
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