Users Guide

Environment/Operating System Issues | Troubleshooting
OMNM 6.5.3 User Guide 739
Environment/Operating System Issues
The following are items that have historically caused some problems. They may not apply to your
environment.
CRON Events
CRON events can update Linux Releases, check for linkage errors and run through other tasks.
This should occur when server traffic is generally higher. If necessary, change it to run late during
off peak hours.
Potential Problem Processes
auditd —This process logs errors periodically, and can send RESTART or KILL signals to processes
outside of its policies. This could be dangerous if configured wrong.
cpuspeed —Throttles down CPU speeds within the Kernel. Since OpenManage Network
Manager’s Java runs in a VM it is unaware of sudden increase/decrease in CPU speeds, and
this could pose issues in threading and calculating thread counts.
SELINUX
This should be disabled. To check, run the following:
[root@AppRedcell01 bin]# selinuxenabled && echo enabled || echo disabled
To fix this, if it indicates it is enabled, modify the /etc/selinux/config and change
targeted to none so this is preserved on reboots.
Hardware Errors
A fragment found in dmesg , triggered further investigation. This detected memory errors.
[Hardware Error]: Machine check events logged
Errors found in /var/log/mcelog:
Hardware event. This is not a software error.
MCE 0
CPU 30 BANK 9
TIME 1370474184 Wed Jun 5 17:16:24 2013
MCA: MEMORY CONTROLLER GEN_CHANNELunspecified_ERR
Transaction: Generic undefined request
STATUS 900000400009008f MCGSTATUS 0
MCGCAP 1000c18 APICID c0 SOCKETID 3
CPUID Vendor Intel Family 6 Model 47
DNS Does Not Resolve Public Addresses
DNS must permit application servers to resolve public DNS names like google.com. Web server
needs this to determine its public facing interface by determining which route the packet went out
on quick test.