Installation guide

Section 2.1:Choosing a Hardware Configuration 21
Hardware Quantity Description Required
Network
power switch
One Network attached power switches
enable each cluster member to power
cycle all others. Refer to Section
2.4.2, Configuring Power Switches for
information about using network attached
power switches, as well as caveats
associated with each.
The following network attached power
switch has been fully tested:
· WTI NPS-115, or NPS-230, available
from http://www.wti.com. Note that
the NPS power switch can properly
accommodate systems with dual
redundant power supplies. Refer to
Section A.1.2, Setting up WTI NPS Power
Switches.
· Baytech RPC-3 and RPC-5,
http://www.baytech.net
Latent support is provided for the APC
Master Switch (AP9211, or AP9212),
www.apc.com
Strongly
recommended
for data
integrity
under all
failure
conditions
Watchdog
Timer
Two
Watchdog timers cause a failed cluster
member to remove itself from a cluster
prior to a healthy member taking over its
services.
Refer to Section 2.4.2, Configuring Power
Switches for more information
Recom-
mended for
data integrity
on systems
which pro-
vide inte-
grated watch-
dog hardware
The following table shows a variety of storage devices for an administrator to choose from. An indi-
vidual cluster does not require all of the components listed below.