Specifications

2 Implementing UPS Configurations with Microsoft Cluster Server
• UPS monitoring: PowerChute PLUS can monitor only one UPS at a time,
independent of the type of communication link to this UPS (serial line or
network). If you attach more than one UPS to a server, then the server cannot
receive signals from all UPS units. Thus, you cannot attach more than one
UPS to a server.
• Storage protection: You must guarantee that the last component in your
cluster to fail is the shared storage, because the cluster service will stop
immediately when it loses access to shared storage.
• Storage power cabling: The shared storage typically consists of more than
one component (RAID controller and multiple drive enclosures). The wrong
order of failure of these components may destroy your RAID arrays. For
example, if a drive enclosure with more than one drive of a RAID-5 array fails
before the RAID controller fails, the RAID controller would mark the whole
array as dead.
In Chapter 3, “UPS configurations for cluster” on page 27, we develop solutions
for these cluster-specific problems.