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This chapter describes how to monitor the Storage Array operational status, and includes the following sections:
Storage Array operational status can be ascertained by observing the status LEDS on the components, or by reading management software reports generated by the Versatile Environmental Monitor (VEM).
All device carriers have two LEDs on the front that indicate the operational status of the disk drives and power supplies. The red LED is controlled by the VEM; the green LED by the disk drive or power supply. A single red LED on the ACM is on when the fan is not functioning.
Table 5-1 summarizes LED status displays for fault conditions. The VEM alarm buzzer sounds in all fault conditions.
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| Type of Fault | Drive LED | PSU LED | ACM LED | VEM LED |
Drive fault | On | — | — | — |
PSU fault | All flash once1 | On | — | — |
ACM fault | All flash once1 | — | On | — |
Temperature condition | All flash once1 | — | — | On |
| 1All drive LEDs flash once, followed by a long pause, and then flash again. This sequence continues until the fault is corrected. |
The Versatile Environmental Monitor (VEM) is an environmental monitoring device that connects with the backplane of the Storage Array, as shown in
Figure 5-1.
The VEM monitors the state of the power supplies, disk drives, Advanced Cooling Module, and enclosure temperature and can communicate with the host system using in-band reporting with support for both SES and SAF-TE protocols. A diagram of the VEM, showing its main components, is shown in Figure 5-2.
The VEM performs the following tasks:
The VEM communicates with the host system with in-band reporting. The VEM supports both SAF-TE and SES protocols. The output from the VEM can be sent to a display unit or to a redundant array of inexpensive disks (RAID) management software program.
In primary array forced-join or split-bus modes, the VEM can only report information over bus 0 with SCSI target ID 15, though a host on bus 0 can obtain status for either bus separately. The VEM responds to logical unit number
(LUN) 0 target ID 15 for bus 0 status and LUN 1 target ID 15 for bus 1 status. In the expansion array configuration, the VEM SCSI target ID is 14.
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Note In split-bus mode, use host-to-host communication if there is a need to transfer VEM data between the host on bus 0 and the host on bus 1. For example, a host on bus 1 can only activate drive failure LEDs on bus 1 disk drives by signaling the VEM on bus 0 through the host on bus 0. |
For more details on SCSI ID mapping refer to "Configuring the Storage Array."
If an overtemperature condition exists, the VEM turns on the Temp LED and the alarm buzzer. The alarm buzzer can be silenced by pressing the Mute button on the VEM card. The VEM controls fault LEDs on the ACMs, power supply carriers, and disk drive carriers. Fault LEDs flash when the device is in an
error condition. All the disk drive carrier LEDs flash when the VEM detects
an enclosure fault, and can be reset only when the condition is cleared.
(See Table 5-1.)
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Note The Mute button temporarily silences the alarm buzzer; it does not stop LEDs from flashing. |
Each ACM has a fault LED, as shown in Figure 5-3.
If an ACM fails, the LED on the ACM turns on, and the alarm buzzer on the VEM card sounds. The alarm buzzer can be silenced by pressing the Mute button.
Each disk drive carrier in a Storage Array has two LED indicators on the front, as shown in Figure 5-4.
The green LED on the left is the device activity indicator, controlled by the disk drive. It is on or flashing when the disk is active.
The red LED on the right is the device fault indicator and is steadily on when the disk has failed. The device fault LED is controlled by the VEM under the SES and SAF-TE protocols. All the disk drive carrier LEDs flash when the VEM detects an enclosure fault, and they can be reset only when the condition is cleared. (See Table 5-1.)
Table 5-2 interprets device carrier LED activity.
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| Device Activity LED | Device Fault LED | Meaning |
|---|---|---|
On | Off | Disk operating normally. |
Flashing | Off | Disk operating normally. |
Off | Off | Disk is inactive and there is no fault. |
On | On | Fault status. Disk may not be responding to control signals and may be bad, or may need a power-off reset. If the problem persists, replace the disk. |
Off | On | Fault status. Disk is inactive and spun down. Replace the disk. |
On | Flashing | Disk is spinning up or down during a hot swap, or spinning down because of an error. |
Off | Flashing | Fault status. Disk has failed. Replace the disk. Signals enclosure fault if all drive carrier LEDs are flashing at the same time. |
The power supply carrier for the Storage Array has two LED indicators, as shown in Figure 5-5.
The green LED on the left is the power supply status indicator controlled by the power supply.
The red LED on the right is the power supply failure LED controlled by the VEM. It is off during normal operation. If a fault condition occurs, this LED turns on or flashes at regular intervals. Table 5-3 explains the power supply carrier LEDs.
| Green LED | Red LED | Meaning |
|---|---|---|
On | Off | Power supply is functioning properly. |
Off | Off | Power supply malfunction or input power problem. |
Off | On | Power supply failure. |
Off | Flashing | Power supply fault. Clear the condition to reset the LEDs. Possible causes are overvoltage or undervoltage condition. |
Posted: Mon Aug 28 18:05:35 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.