Server Technology Sentry Switched CDU

A few notes for future reference. I am playing with a power distribution unit from Server Technology  – Model CW-16VE-P32M

Initially to configure the device I plugged both the Cabinet Distribution Unit (CDU) unit and a laptop into a switch, setting the IP address to the same subnet as the unit. I set the laptop to / and then visited the web interface of the Sentry CDU logging in as user admn with password admn

After logging in I was able to reconfigure the device changing the IP address, admn password, SMTP, SNMP settings etc

Sentry CDU

Firmware Update

The firmware is available from:

I browsed to the directory for my product and checked the swcdu-history.txt file that I was getting the correct file for my model. This is found by checking the Configuration > System page where the ethernet MAC address is shown. The fourth octet indicates the model version (e.g. 51) in the mac below:


I then downloaded the firmware for my model: swcdu-v70p.bin

to a FTP accessible path on my private subnet. I next visited the Configuration > FTP page to set the path to the firmware update:

Sentry Switched CDU

Clicking the ‘Test’ button checks the FTP configuration. After a few adjustments I got the ‘Test Passed’ message. Once the FTP config is set visit the telnet interface as below and issue the command ‘restart ftpload’.

Sentry Switched CDUThis updated the firmware for me from version 6 to version 7.


The MIB files for the device are available from   Download the Sentry3.mib file and copy it to /usr/share/snmp/mibs then use it with your snmp commands as follows:

snmpwalk -v 2c -c mysnmpstring -M /usr/share/snmp/mibs -m +Sentry3-MIB SentryIP .


  • mysnmpstring – to the value you set under Configuration > SNMP, default is public
  • SentryIP – The IP address of your Sentry device e.g.

For a single value rather than a walk:

snmpget -v 2c -c mysnmpstring -M /usr/share/snmp/mibs -m +Sentry3-MIB SentryIP Sentry3-MIB::infeedLoadValue.1.1

My main aim for using this Switched CDU was to get power values for each outlet. I was able to get to outletStatus with:

( outletStatus.1.1.6 = . )

This list of Sentry OIDs shows that there could be an OID for outletLoadValue how I kept getting “No Such Instance currently exists at this OID” for :

(outletLoadValue = .

I contacted Server Technology and am awaiting a reply to see if this model supports outletLoadValue.

I had a chat session on the Server Technology website and they were very helpful. They have a range of devices for  Per Outlet Power Sensing POPS  and the CW-16VE-P32M doesn’t do that.

Leave a Reply

  • (will not be published)

XHTML: You can use these tags: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code class="" title="" data-url=""> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong> <pre class="" title="" data-url=""> <span class="" title="" data-url="">