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--- essential_quick_start_data_analytics_systems [2021/04/28 14:04]
brandonm [Power Control:] Word and punctuation fixes
+++ essential_quick_start_data_analytics_systems [2021/05/19 16:03] (current)
brandonm [Worker Nodes:] Word fix
@@ Line 11: / Line 11: @@
 There is also a GUI tool for adding and deleting users. The GUI can be be found in the root ''Applications/System Tools'' menu or started from the command line using:
 <code>
-$AddUser -g
+$ AddUser -g
 </code>
 See [[Adding Users|Adding Users]].
 ====The Case: ====
-The case has two doors on both sides and a removable front bezel. The front bezel can be "popped" off by opening one (or both) of the doors and pulling the bezel forward. Behind the bezel you will find the three node blades. The blades are placed behind the bezel to provide protection and allow limited access (under normal conditions you will not need to access the blades). There are also six removable (not hot swap) 3.5-inch drive bays across the top on the inside. Depending on the model, there may also be user-accessible removable SSD drives (also not hot swap). Local LAN port and Video are labeled on the back.  (Note: On AMD Systems, the video port on northerner board is non-functional.)
+The case has two doors on both sides and a removable front bezel. The front bezel can be "popped" off by opening one (or both) of the doors and pulling the bezel forward. Behind the bezel you will find the three node blades. The blades are placed behind the bezel to provide protection and allow limited access (under normal conditions you will not need to access the blades). There are also six removable (not hot swap) 3.5-inch drive bays across the top on the inside. Depending on the model, there may also be user-accessible removable SSD drives (also not hot swap). Local LAN port and Video are labeled on the back.  (Note: On AMD Systems, the video port on the motherboard is non-functional.)
 ====Login Node (Main Node): ====
@@ Line 24: / Line 24: @@
 The worker nodes are on blades that are behind the bezel. Blades are removed by turning off the blade power (see below), removing the cables, unscrewing the captive bolts (top and bottom), and pulling the blade out using the captive bolts. The blade positions are unique (the same blade must always be placed in the same slot, due to DHCP booting (HPC systems) or the attached HDFS drives (Hadoop systems)).  The blades have a number on the small power-supply on the back of the board.
-Node names begin with "n0" and continue to the total number of workers in the system. Typically, this is ''n0, n1, n2''. Looking at the front of the system with the bezel off, node ''n0'' is in the right most position. node ''n1'' is in the middle, and node ''n2'' is in the left most position and can be seen when the through the door.
+Node names begin with "n0" and continue to the total number of workers in the system. Typically, this is ''n0, n1, n2''. Looking at the front of the system with the bezel off, node ''n0'' is in the right most position. node ''n1'' is in the middle, and node ''n2'' is in the left most position and can be seen when looking through the door.
 ====Networking: ====
@@ Line 50: / Line 50: @@
 ====SSH Access:====
-The root user has ''ssh'' access to all nodes e.g. ''ssh n0'' Users do not have ''ssh'' access to the worker nodes. These nodes are used though the Slurm WorkFlow Scheduler. See [[Using the Apache Ambari Cluster Manager|Using the Apache Ambari Cluster Manager]].
+The root user has ''ssh'' access to all nodes, e.g. ''ssh n0''. Users do not have ''ssh'' access to the worker nodes. These nodes are used though the Slurm WorkFlow Scheduler. See [[Using the Apache Ambari Cluster Manager|Using the Apache Ambari Cluster Manager]].
 ====File System:====
-The file system configuration can vary depending installation options. In general, there is a solid state NVME drive on the head node that stores the OS There is an /opt and /home partition NFS mounted to all nodes. If a RAID option has been included, the RAID drives will be installed in the top drive area in the case and mounted on the head node.
+The file system configuration can vary depending on installation options. In general, there is a solid state NVMe drive on the head node that stores the OS. There is an /opt and /home partition NFS mounted to all nodes. If a RAID option has been included, the RAID drives will be installed in the top drive area in the case and mounted on the head node.
-On Hadoop systems, each node has a NVME drive for the OS and Hadoop software. One or two additional SATA drives are also attached to each node. These drives are used for Hadoop HDFS storage.
+On Hadoop systems, each node has a NVMe drive for the OS and Hadoop software. One or two additional SATA drives are also attached to each node. These drives are used for Hadoop HDFS storage.
 ====Software:====
-The system has been installed with CentOS 7 as the base distribution. Specific Limulus RPM packages that provide management tools, an updated kernel, power control drivers, etc. have also been installed  The yum utility can be used to add additional software to the login node.
+The system has been installed with CentOS 7 as the base distribution. Specific Limulus RPM packages that provide management tools, an updated kernel, power control drivers, etc. have also been installed.  The ''yum'' utility can be used to add additional software to the login node.
-On Hadoop systems, all node software is managed by the Ambari management system (on the head node open local browser to ''http:/localhost:8080'') See [[Using the Apache Ambari Cluster Manager|Using the Apache Ambari Cluster Manager]].
+On Hadoop systems, all node software is managed by the Ambari management system (on the head node, open local browser to ''http:/localhost:8080''). See [[Using the Apache Ambari Cluster Manager|Using the Apache Ambari Cluster Manager]].
 ====Adaptive Cooling and Filters: ====
-The nodes have adaptive cooling. There are two intake fans underneath the worker nodes pushing air up into the nodes from underneath the case. The speed of the intake fans will increase or decrease depending on the node processor temperatures. Note that all intake locations on the case have magnetic dust filters (including the bottom of the case). In dusty environments, these filters will become dirty and can adversely affect the ability of the fans to move air through case. It is recommended that you check and clean these filters regularly. They can be easily cleaned with water. See [[Adaptive Cooling|Adaptive Cooling]].
+The nodes have adaptive cooling. There are two intake fans underneath the worker nodes pushing air up into the nodes from underneath the case. The speed of the intake fans will increase or decrease depending on the node processor temperatures. Note that all intake locations on the case have magnetic dust filters (including the bottom of the case). In dusty environments, these filters will become dirty and can adversely affect the ability of the fans to move air through the case. It is recommended that you check and clean these filters regularly. They can be easily cleaned with water. See [[Adaptive Cooling|Adaptive Cooling]].
 ====Monitoring:====
 On Hadoop systems, the [[Using the Apache Ambari Cluster Manager|Apache Ambari Cluster Manager]] provides complete node (and Hadoop) monitoring.
-In addition, there is also a command line utility called wwtop. This utility provides a real-time "top" like interface for the entire cluster (including node temperatures).
+In addition, there is also a command line utility called wwtop. This utility provides a real-time "top"-like interface for the entire cluster (including node temperatures).
 ====Additional Information:====
 See the rest of this manual for additional topics and information.

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