I have a pair of R620’s with XenServer 6.1 installed – needed to enable some external monitoring for obvious reasons. Xen looks to be built upon a flavor of CentOS, so the update commands are “yum”.

Install SRVADMIN OMSA
SSH into your xenserver as the root user
wget -q -O - http://linux.dell.com/repo/hardware/latest/bootstrap.cgi | bash
nano /etc/yum.repos.d/CentOS-Base.repo
Find “[base]” and make sure to set it to enabled=1
Save and close nano
yum install srvadmin-all
y

Edit the firewall to allow incoming SNMP/OMSA connections
system-config-securitylevel-tui
Press Tab twice, navigate to “Customize”
Other Ports/Allow Incoming
Add the following after any other text (my system had “ha-cluster:udp”)
,1311:tcp,161:udp
This should now read “ha-cluster:udp,1311:tcp,161:udp”
Select OK and then OK again to close out of the system configuration

Edit SNMP to allow RO access from all
nano /etc/snmp/snmpd.conf
Find “view systemview included snmp”
After this line add a new line containing:
view systemview included .1
Save and close nano

Restart the SNMP daemon
service snmpd restart

Start Dell OMSA
/opt/dell/srvadmin/sbin/srvadmin-services.sh start

Start OMSA after a reboot
nano /etc/rc.local
Add this to the bottom
/opt/dell/srvadmin/sbin/srvadmin-services.sh start
Save and close nano

Verify this is working
https://nameofyourserver:1311
Login with your root credentials