Dell PowerVault MD1120 - Manual (Page 13)

About Your System
13
Back-Panel Indicators and Features
Figure 1-4 shows the back-panel features of a fully populated enclosure
containing two enclosure management modules (EMMs) and two power
supply/cooling fan modules. The enclosure requires at least one EMM to be
installed. If only one EMM is installed, it must reside in the primary (left, as
seen from rear of enclosure) EMM bay and the secondary EMM bay must
contain a blank module cover (see "Installing an EMM Module Cover in an
Empty Bay" on page 34). Both power supply/cooling fan modules must be
installed. However, the enclosure can run temporarily on one power
supply/cooling fan module. For more information, see "Power Supply and
Cooling Fan Features" on page 18.
Figure 1-4. Back-Panel Features
Green/amber flashing
Green On 500 ms
Amber On 500 ms
Off 1000 ms Predicted failure reported by physical disk
Green/amber flashing
Green On 3000 ms
Off 3000 ms
Amber On 3000 ms
Off 3000 ms Physical disk is being spun down by user request or
other nonfailure condition
1 primary EMM 2 secondary EMM
3 power supply/cooling fan modules (2)
Table 1-3. Physical Disk Carrier Status LEDs (continued)
LED Description
1 2
3