APC's MasterSwitch plus is a remote power distribution unit (PDU) that
allows users to individually control power to connected devices. The
MasterSwitch plus allows users to either locally or remotely shutdown or
reboot up to eight connected servers of different operating systems. MIS or
IT personnel no longer need to carry a pager on weekends or on a hard-earned
vacation. Either via a telnet connection or even over TCP/IP via a browser,
computer gurus can remotely restart or shutdown servers. More often than
not, a reboot usually solves the problem. Of course MIS personnel may still
need that pager after all in the event of a more serious problem.
Nonetheless, remote power distribution units do allow MIS personnel to more
quickly respond to a failure and do it without having to drive to the
office.
INSTALLATION
Setting up the MasterSwitch plus was fairly easy. We took it out of the box
and connected several PCs to the eight available outlets on the back of the
MasterSwitch plus. Next, we connected a serial cable from the MasterSwitch
plus to one of the PCs. Next, we connected an RJ-45 cable from a 10/100
Base-T hub to the network port on the unit. Finally, we installed the
software that shipped on the CD-ROM.
From the software we connected to the PC via a serial connection so as to
be able to set the IP address on the MasterSwitch unit. After setting the IP
address, we opened our browser, typed in the chosen IP address, and were
prompted to enter our username and password. The default username and
password is �apc� which we actually guessed, although it is written in the
documentation. From the browser interface, we were able to add users, change
passwords, assign users to outlets, and set other options.
DOCUMENTATION
The documentation consists of a single booklet that is 26 pages long. It
includes instructions on how to mount the unit on a 19-inch rack with the
included brackets. What is unclear in the documentation is how to
"power protect" the MasterSwitch plus. That is, with eight
electrical outlets on the MasterSwitch plus, the unit should no doubt be
connected to a UPS. However, on page eight of the documentation, it clearly
states, "Connect the power cord of the MasterSwitch plus unit into a
single-phase, 120-VAC, 15-amp outlet."
This contradicts our assumption that the MasterSwitch should be connected
to a UPS to protect the eight MasterSwitch outlets. For our tests, we
connected the MasterSwitch to a UPS anyway rather than a standard wall
outlet. But we were concerned that if we simulated a power failure, the
power drain from eight PCs connected to the MasterSwitch Plus might damage
one of our lab UPSs. We've read in many UPS manuals that you should never
connect a laser printer to a UPS due to the high spike in power consumption
that laser printers have when printing. We were concerned this was also
applicable when having eight PCs connected to the MasterSwitch, which in
turn is connected to a UPS. We weren't sure if this was safe or not and the
documentation didn't address our concerns. Also, the manual states that you
can connect a serial cable to an APC brand UPS for communication between the
two. Again, the documentation does not state to what extent the two
communicate. For instance, can the MasterSwitch control the UPS's outlets
via the serial connection? We did research this further and found out via
APC's Web site that the MasterSwitch can detect when the UPS has entered
"on battery" state and will automatically shut down connected
servers followed by shutting off the attached outlets after the shutdown has
been confirmed.
In any event, the rest of the documentation was well organized and
contained step-by-step instructions for various configurations, including
daisy-chaining multiple MasterSwitch units.
Other than the two aforementioned omissions, the documentation was good.
Nonetheless, TMC� Labs expects thoroughness and complete documentation,
which is why the documentation grade only earned a 3.75 rating.
FEATURES
Administrators have the ability to assign individual outlets or groups of
outlets to specific users. Password protected user, administrator, and
device manager accounts ensure restricted access to system, device, and
outlet level services. The MasterSwitch plus allows for automatic shutdown
of connected servers attached to an APC UPS when the UPS enters
�on-battery� state, and for the attached outlet to be turned off after the
server has confirmed shutdown. Another nice feature is a
"graceful" reboot. That is, the system will shut down servers
before cycling power to the equipment. The unit can manage connected devices
via a Web-based interface through a built-in Ethernet connection and telnet,
and utilizes MD-5 security.
Other features include the ability to:
- Control eight on-board power outlets for complete and flexible
management of connected equipment;
- Use MasterSwitch plus to power down connected equipment on an
outlet-by-outlet basis to conserve battery backup power;
- Configure (as a user) the sequence in which power is provided to
individual receptacles upon startup;
- Connect up to three units serially to one unit, providing control of
32 connected devices with one IP address; and
- Upgrade firmware via Internet downloads for future enhancements.
OPERATIONAL TESTING
Testing the MasterSwitch plus was fairly straightforward. After logging onto
the unit via Internet Explorer, we proceeded to examine the user interface
for adding users and assigning users to specific outlets. Adding a user is
fairly simple, requiring a username, password, authentication phrase, user
description, and account status. In addition, you can choose which outlets
the user can control simply by placing a checkmark in the appropriate
checkboxes. Overall, the browser interface for adding users was very easy to
use and we were quite pleased with it. We also liked the usage of a
tree-like structure on the left border, which expands as you click on a
particular feature.
Also, from the browser interface you can change from using a static IP
address to using BOOTP (DHCP) for automatically acquiring a TCP/IP address.
The browser interface also allows you to configure SNMP, TFTP, FTP, and
telnet. We also noticed from the Web interface that we could configure the
restart delay, power on delay, power off delay, and reboot duration on an
outlet-by-outlet basis
Our major test involved seeing if we could remotely shut down servers. We
put the MasterSwitch unit on our testing network, though we could have put
it directly on the Internet, but that would require futzing with our
firewall settings. Thus, for the sake of simplicity, we used our test
network. Then we logged onto the MasterSwitch across the Internet via
Internet Explorer. Next, we told the MasterSwitch plus to shut down outlet
number 3. Immediately, we could hear a click in the MasterSwitch, indicating
that the circuit had been tripped off and the green LED for that particular
outlet turned off. Also, the PC we had connected to that outlet immediately
shut off, albeit less than gracefully.
To test the "graceful shutdown" feature, we next chose
"shutdown," which communicated with the PC via one of the eight
serial connections on the MasterSwitch plus to tell the PC to shut down.
This test passed without a hitch.
ROOM FOR IMPROVEMENT
As previously stated, the manual is unclear on how this product integrates
with a UPS. Thus, we would like some clarity in the documentation. Although
the MasterUnit plus supports SNMP, we would like to see support for paging
and e-mail notification of any event conditions (such as a power failure)
natively in the unit itself. This might require a modem added to the unit
for sending a message to pagers and support for SMTP service for sending out
an e-mail.
CONCLUSION
TMC Labs was very impressed with the functionality of APC's MasterSwitch
plus product. The ability to remotely reboot a server or cycle power on any
of the eight MasterSwitch outlets is something that most MIS & IT
departments can certainly use, especially to save emergency trips to the
office on a nice sunny Saturday afternoon! TMC Labs gives high marks to the
MasterSwitch plus and we highly recommend it.
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