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Consider the following extra-large cluster topology, for example:
This contiguous rack architecture is designed to scale up to the current maximum PowerScale cluster size of 252 nodes, in 63 4RU chassis, across nine racks as the environment grows - while still keeping cable management relatively simple. Note that this configuration assumes 1RU per node. If using F910 or F900 nodes, which are 2RU in size, additional rack capacity should be budgeted for.
Best practices include:
For Hadoop workloads, PowerScale clusters are compatible with the rack awareness feature of HDFS to provide balancing in the placement of data. Rack locality keeps the data flow internal to the rack.
Excess cabling can be neatly stored in 12” service coils on a cable tray above the rack, if available, or at the side of the rack.
The use of intelligent power distribution units (PDUs) within each rack can facilitate the remote power cycling of nodes, if desired.
For deep nodes such as the H7000 and A3000 platforms, where chassis depth can be a limiting factor, horizontally mounted PDUs within the rack can be used in place of vertical PDUs, if necessary. If front-mounted, partial-depth Ethernet switches are deployed, horizontal PDUs can be installed in the rear of the rack directly behind the switches to maximize available rack capacity.