Chapter 1: Introduction
1-11
Figure 1-11: PSU Module
Each PSU module comes with a power socket for power cord plug-in. All three power
supplies are turned on and off using a single power switch on the enclosure chass is. Each
PSU also comes with two (2) embedded cooling fans to provide sufficient airflow across
its heat-generating components and one (1) LED to indicate the PSU status. An extraction
handle makes it easier to install or remove the PSU from the subsystem. While a PSU
may be removed when the system is still online, this should only be done if the PSU has
failed and needs to be replaced.
A retention screw through the extraction handle secures the PSU to the chassis. If the
PSU needs to be removed, the retention screw must be removed first. After installing a
new PSU module, make sure that the retention screw has been firmly secured. The
shipping package contains adjustable cable clamps that can be used to secure power cord
connections.
PSU specifications are shown in Appendix A.
Power Supply Safety Restrictions No. of Failed PSUs Responses and Preventive Actions
1
1. Warning messages are issued.
2. Cached data is flushed to the hard drives (also depends on
the Event Triggered configuration settings of the
firmware).
3. If previously configured to the Write-back mode, the
caching mode is automatically switched to the
conservative Write-through mode.