HP XC System Software Release Notes for Version 2.1

• nodenaming_prefix represents the node naming prefix defined in the
/opt/hptc/config/discover_data.ini file.
• max_size_of_file is calculated as follows:
30% * (/hptc_cluster partition size in MB)/5*(number
of nodes in the cluster + number of syslogng_forward
server +1)
- The number of syslogng_forward servers represents the
number of management aggregators that have been defined for the
system. A syslogng-forward service is allocated for each assigned
management hub role.
The following command shows that the system has five forwarders:
# shownode servers syslogng_forward
<nodenaming_prefix>[252-256]
- Use the following command to determine the size of the
/hptc_cluster partition in megabytes:
# df -B M /hptc_cluster | tail -1 | awk ’{print $2}’
5424
Thus, using the data obtained in this example, use the following calculation
to determine the value for max_size_of_file on a 256 node cluster
(approximately 1,302,436 bytes):
0.30 * (5424 MB) / 5 * (256 + 5 + 1) = 1.2421 MB
2. Use the text editor of your choice to modify the template file:
/opt/hptc/syslog-ng/etc/global/syslog_ng_global_header_1
3. Change the line that looks like this:
tcp(ip(0.0.0.0) max-connections(300) port(514));
To this:
tcp(ip(0.0.0.0) max-connections(300) port(514) keep-alive(yes));
4. Save your changes and exit the file.
5. Reconfigure and restart the syslog-ng service:
# service syslog-ng nconfigure
# service syslog-ng restart
6.3 Recommended NFS Mount Options for External
Connections
Access to some external NFS mounts may become hung on the head node. The
problem is intermittent and is difficult to reproduce. Other symptoms of the
problem may include high IOWAIT or load average values and processes stuck
in the uninterruptable sleep D state. When the system is in this state, the only
method to recover is to reboot the head node.
HP has not been able to reproduce the problem when external NFS mounts use
the noac and noacl NFS mount options. Therefore, until this problem is better
understood and fixed in a future update of the XC system software, HP recommends
using the noac and noacl NFS mount options on all external NFS mounts.
6-2 System Administration and Management Notes