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C H A P T E R  4

The SAS-NEM

This chapter describes the functionality of a SAS-NEM as it pertains to connecting server and disk modules.

Installation of SAS-NEMs is covered briefly in this manual because a Sun Blade 6000 Disk Module does not work without the presence of a SAS-NEM.

SAS-NEMs are fully described in their own documentation. Refer to the Sun Blade 6000 Disk Module Administration Guide (820-4922) for a complete list of supported SAS-NEMs.

This chapter contains these topics:

Overview of the SAS-NEM

There are various Network Express Modules that can be plugged into the Sun Blade 6000 Modular System chassis. SAS-NEMs are those that contain circuitry to provide multiple SAS connections to disk drives. All Network Express Modules, including SAS-NEMs, plug into the Network Express Module slots on the back of the chassis and are hot-pluggable.

Inserting a SAS-NEM

You can insert either one or two SAS-NEMs in the Sun Blade 6000 chassis. If you insert only one, it must go in the lower slot (NEM 0).

procedure icon  To Insert a SAS-NEM

  1. From the rear of the chassis, remove the NEM filler panel.

  2. Align the SAS-NEM with the vacant NEM slot.

    Ensure that:

    • The SAS-NEM ejector levers are on the top of the module, facing you.

    • The SAS-NEM ejector levers are fully opened.

  3. Slide the SAS-NEM into the vacant NEM chassis slot until you feel it stop.

    FIGURE 4-1 shows how to install a SAS-NEM.

    FIGURE 4-1   Installing a SAS-NEM

    Figure showing SAS-NEM installation


  4. Complete the installation by closing the ejector levers to secure the SAS-NEM in the chassis.

Removing a SAS-NEM

If a Network Express Module (SAS-NEM) fails, you need to replace it. You can remove and replace a SAS-NEM from a powered-on chassis using a hot-plug operation, as well as from a powered-off chassis.


caution icon

Caution - Make sure that none of the server blades are actively accessing Ethernet ports or disk drives in a disk module before you remove the SAS-NEM.


procedure icon  To Remove a SAS-NEM

  1. In the rear of the chassis, locate the SAS-NEM that you want to remove.

  2. Remove all cables that are plugged into the SAS-NEM.

  3. Press together and hold the ejector buttons on both the right and left ejector levers.

    FIGURE 4-2 shows how to remove a SAS-NEM.

    FIGURE 4-2   Removing a SAS-NEM

    Figure showing SAS-NEM removal


  4. To unlatch the SAS-NEM from the chassis, open the ejector levers by extending them outward.

  5. Holding the opened ejector levers, pull the SAS-NEM toward you until you can pull the rest of the module out by hand.


    hot surface icon

    Caution - If the chassis is powered on and you are not replacing the SAS-NEM within 60 seconds, install a NEM filler panel to ensure proper system operation.


Replacing a SAS-NEM

If a SAS-NEM fails it must be replaced immediately. You cannot simply replace the failed SAS-NEM with a new one. You must follow the procedure as described in the SAS-NEM documentation.



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