Dell PowerVault 220S (SCSI) - Manual (Page 5)

Introduction: Dell PowerVault 220S and 221S Systems User's Guide
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Table 1-2. Audible Alarm Critical and Noncritical Events
Critical Events Noncritical Events
Two or more cooling-module blowers have failed or a cooling
module is not installed.
One power supply has failed.
One or more temperature sensors are in the critical range. One cooling module blower has failed or is not
installed.
Split-bus module not installed. One or more temperature sensors are in the
warning range.
One EMM has failed.
NOTE: It is rare for both EMMs to fail simultaneously. However, if this event occurs, the system cannot issue critical or
noncritical event alarms for any system component. If both power supplies fail simultaneously, the system can issue
critical or noncritical event alarms only if 5-V power is available.
Hard-Drive Carrier LED Indicators
Each of your system's 14 hard-drive carriers have two LED indicators (see Figure 1-2 ). The first LED is a green busy
indicator, controlled by the hard drive, that is illuminated when the hard drive is active on the SCSI bus. The second LED is a
two-color (green and amber) status indicator. Table 1-3 lists the status indicator flash patterns.
Table 1-3. Hard-Drive Carrier Indicator Patterns
Condition Status Indicator Pattern
Slot empty, ready for insert/remove Off
Drive online, prepare for operation
Steady green
Drive identify Flashes green four times per second
Prepare for removal Flashes green twice per second at equal intervals
Drive rebuild Flashes green twice per second at unequal intervals
Drive fail Flashes amber four times per second
Predicted failure Flashes green, then amber, then off, repeating this sequence every two seconds
Back-Panel Features
Figure 1-3 illustrates the back-panel features for redundant systems. Figure 1-4 illustrates the back-panel features for
nonredundant systems.
Figure 1-3. Back-Panel Features (Redundant Systems)