Chapter 4: PSU Replacement

Home Prev	NetShield 6000 Series Getting Started Guide	Next

The NetShield 6000 Series can be fitted with dual hot-swappable Power Supply Units (PSUs), both of which are capable of acting as a sole power supply for the appliance and which, together, provide redundancy against PSU failure. There is one type of PSU for AC power and another for DC power.

Figure 4.1. A NetShield 6000 Series PSU (AC Power)

As standard, the NetShield 6000 Series is delivered with only a single PSU fitted and the second PSU slot is occupied by a dummy slot filler which suppresses the second slot's failure alarm. A second PSU must be ordered as a separate item if it is required. The NetShield 6000 Series is capable of operating with only one PSU fitted but that provides no redundancy.

A second PSU is fitted into the second PSU slot after taking out the dummy slot filler. Each PSU module is secured by a lock which is internal to the PSU and this is opened with a black sliding locking lever. There is also a silver metal hinged retaining bracket on each PSU which is used for preventing the power cable from pulling out accidentally.

With two PSUs installed, only one of the PSUs is active and supplying power. If the active PSU fails then the other PSU will become active with no disruption to traffic throughput. The failed PSU can then be replaced with a new PSU and this can be done while the NetShield 6000 Series is processing live traffic.

Symptoms of PSU Failure

If two PSUs are fitted to provide redundancy and there is a single PSU failure, an audible alarm will be heard coming from the appliance. This alarm can be switched off by pressing the red button located to the right of the PSUs. This is shown in the image shown below.

Figure 4.2. NetShield 6000 Series PSU Alarm Shutoff Button

In normal operation there is a green LED light that is illuminated on the back of each PSU. This LED will not be illuminated if power is available and its PSU has failed. The LED is shown illuminated in the image shown below.

Figure 4.3. NetShield 6000 Series PSU Power LED

Monitoring PSU Status with cOS Stream Hardware Monitoring

The current PSU status and therefore failure can be detected by using the cOS Stream Hardware Monitoring feature and this is fully described in the separate cOS Stream Administration Guide. This feature can confirm for the administrator that a PSU has failed and which PSU it is.

Steps for Swapping a PSU (AC Power)

To swap a PSU, use the following steps:

If the metal retaining bracket is covering the PSU's power supply cord connector, push this upwards and fully back.

Remove the power supply cord from the PSU.

Push the PSU's locking lever to one side and pull the PSU out.

Figure 4.4. NetShield 6000 Series PSU Removal

Insert the new PSU, making sure that it is fixed securely in place by the locking lever.

Reinsert the power cord into the new PSU and apply power. The green status LED on the PSU should illuminate and cOS Stream hardware monitoring should also indicate the presence and positive status of the new PSU.

Move the PSU's hinged metal retaining bracket back so that it covers the cable connector to prevent it being accidentally pulled out.

	Note: Having a spare PSU available on-site
	Having a spare PSU on-site and available will mean no delay if a replacement is required. These can be ordered from your Clavister sales representative.