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The "DataNode" page has been changed by GridEngine: http://wiki.apache.org/hadoop/DataNode?action=diff&rev1=2&rev2=3 Comment: be specific DataNode instances can talk to each other, which is what they do when they are replicating data. - * There is usually no need to use RAID storage for DataNode data, because it is all designed to be replicated across multiple servers, rather than multiple disks on the same server. + * There is usually no need to use RAID storage for DataNode data, because data is designed to be replicated across multiple servers, rather than multiple disks on the same server. - * An ideal configuration is for a server to have a DataNode, a TaskTracker, and then physical disks one TaskTracker slot per CPU. This will allow every TaskTracker 100% of a CPU, and separate disks to read and write data. + * An ideal configuration is for a server to have a DataNode, a TaskTracker, and then physical disks one TaskTracker slot per CPU. This will allow every TaskTracker 100% of a CPU, and separate disks to read and write data. * Avoid using [[NFS]] for data storage in production system.
