HP XC System Software Administration Guide Version 3.2.1

18.2 Understanding the Global fstab File............................................................................................219
18.3 Mounting Internal File Systems Throughout the HP XC System...............................................221
18.3.1 Understanding the csys Utility in the Mounting Instructions............................................222
18.3.2 Mounting Internal File Systems...........................................................................................223
18.4 Mounting Remote File Systems...................................................................................................226
18.4.1 Understanding the Mounting Instructions.........................................................................227
18.4.2 Mounting a Remote File System..........................................................................................228
19 Managing Software RAID Arrays..........................................................................231
19.1 Overview of Software RAID........................................................................................................231
19.1.1 Software RAID-0..................................................................................................................231
19.1.2 Software RAID-1..................................................................................................................231
19.2 Installing Software RAID on the Head Node..............................................................................231
19.3 Installing Software RAID on Client Nodes.................................................................................231
19.4 Examining a Software RAID Array.............................................................................................232
19.5 Error Reporting............................................................................................................................233
19.6 Removing Software RAID from Client Nodes............................................................................233
20 Using Diagnostic Tools...........................................................................................235
20.1 Using the sys_check Utility.........................................................................................................235
20.2 Using the ovp Utility for System Verification.............................................................................235
20.3 Using the dgemm Utility to Analyze Performance.....................................................................241
20.4 Using the System Interconnect Diagnostic Tools........................................................................242
20.4.1 HP XC Diagnostic Tools for the Myrinet System Interconnect...........................................242
20.4.1.1 The gm_prodmode_mon Diagnostic Tool...................................................................242
20.4.1.2 The gm_drain_test Diagnostic Tool.............................................................................243
20.4.2 Using Diagnostic Tools for the Quadrics System Interconnect...........................................243
20.4.2.1 The swmlogger Daemon.............................................................................................243
20.4.2.2 The qselantestp Diagnostic Tool..................................................................................244
20.4.2.3 The qsnet2_level_test Diagnostic Tool.........................................................................245
20.4.2.4 The qsnet2_drain_test Diagnostic Tool........................................................................247
20.4.3 Using Diagnostic Tools for the InfiniBand Interconnect.....................................................247
20.4.4 Using Diagnostic Tools for the Gigabit Ethernet System Interconnect...............................248
21 Troubleshooting........................................................................................................249
21.1 General Troubleshooting.............................................................................................................249
21.1.1 Cannot Connect to Database During Configuration...........................................................249
21.1.2 Mismatched Secure Shell Keys............................................................................................250
21.1.3 NFS Mount Failure (Permission Denied)............................................................................250
21.1.4 NFS Attribute Caching on Large-Scale Systems.................................................................250
21.1.5 Stale Metrics Data................................................................................................................250
21.2 Nagios Troubleshooting...............................................................................................................251
21.2.1 Determining the Status of the Nagios Service.....................................................................251
21.2.2 Nagios Fails to Start.............................................................................................................251
21.2.3 Nagios Log Files..................................................................................................................252
21.2.4 Running Nagios Plug-Ins Manually....................................................................................252
21.2.5 Using the nrg Command's Analyze Mode..........................................................................252
21.2.6 Multiple %EXPR% Expressions Are Not Accepted in the nagios_vars.ini File..................253
21.3 Messages Reported by Nagios.....................................................................................................253
21.4 System Interconnect Troubleshooting.........................................................................................256
21.4.1 Myrinet System Interconnect Troubleshooting...................................................................256
21.4.2 Quadrics System Interconnect Troubleshooting.................................................................257
21.4.3 InfiniBand System Interconnect Troubleshooting...............................................................259
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