HP XC System Software Release Notes for Version 3.0

7 System Administration and Management Notes
This chapter contains notes about system administration and management commands and tasks.
Perform the tasks only when necessary.
7.1 Multiple %EXPR% Expressions Are Not Accepted In the nagios_vars.ini
File
The nagios_vars.ini file is intended for site specific customizations. Problems occur if you
modify the entries in this file to contain more than one %EXPR% variable. For example, the
following entry causes the Nagios plug-in(s) that use this information to fail to report the correct
status.
loadave_warning =
%EXPR(%LDAVEWARN%+5)%,%EXPR(%LDAVEWARN%+4)%,%EXPR(%LDAVEWARN%+4)%,10
Instead of using the previous syntax, use simple numbers as shown in the following example:
loadave_warning = 11,10,10,10
7.2 The collectl Utility Does Not Correctly Handle the Change to Daylight
Savings Time
When the time changes to daylight savings time (DST), the collectl utility stops rolling its
log files. As a result, all data is written to the current log, and the log grows uncontrolled in size.
To work around this issue, restart the collectl service on all nodes on which it is currently
running:
# service collectl restart
7.3 startsys Option Does Not Work Correctly
The startsys --rsync_only option does not work correctly. Nodes will image but may not
boot because of disk volume labeling problems.
As a work around, use the default startsys option which uses Flamethrower instead of rsync.
7.4 Possible Performance Problems on NAT Clients Using TCP/IP
Applications running on NAT clients that access the external network with TCP/IP may notice
some performance problems or failures. In particular, NFS file systems that are mounted on NAT
clients using TCP have experienced some performance problems. External access from NAT
clients using UDP has been shown to work well.
However, if access to the external network using TCP is required, use the following steps to
create a NAT client configuration with a single default gateway.
1. Before beginning this procedure, ensure that all available software patches for this release
have been applied to the system.
2. Save the default_gateway file on all NAT client nodes, excluding the NAT servers and
head node:
# pdsh -a -x NAT_server and head_node \
cp /etc/init.d/default_gateway /etc/init.d/default_gatewaySAVE
For example, if the head node is n124 and the NAT servers are nodes n122 and n123, you
would enter a command similar to the following:
# pdsh -a -x n[122-124] cp /etc/init.d/default_gateway \
/etc/init.d/default_gatewaySAVE
If the nodes names are not sequential, enter a command similar to the following:
7.1 Multiple %EXPR% Expressions Are Not Accepted In the nagios_vars.ini File 43