Warning

Read completely the instructions detailed in Preliminary Service Information.

Hard Disk Drive

Your Apricot is equipped with SCSI hard disk drives which are hot pluggable, i.e. you can remove or fit them while the system is powered up. Use the following instructions if a specific hard disk needs to be replaced. You can identify a specific drive by observing the labelling scheme as shown in the following illustration:

In addition to the external labelling scheme, (the disk numbers within any module follow the same scheme) each SCSI drive, including the removable media drives, is assigned its own SCSI identification number.

As the system boots up, a list will appear for each SCSI adapter, listing the drives attached to it. It will also give drive SCSI identification numbers, along with brief details of each drive.

Caution

It may be wise to keep a separate written record of which trays are fitted with drives. alongside their specification and then update this record with any changes or additions.

Removing a drive

Turn the hard disk tray release handl anti-clockwise until it stops, which is almost one complete turn. As you turn the handle, the tray ejects slightly.

1 Disk Drive Tray 2 Disk Tray Release Handle

If you are removing the disk while the system is powered up, wait at least 10 seconds to allow the disk to stop spinning and the heads to park before continuing with this procedure.

Slide the tray out carefully until it is free of the chassis.

4. Place the assembly into suitable packaging.

Note

Since the hard disk drives for your Apricot are exclusively SCSI drives, it is important to note that the SCSI connector on the backplane of the drive module contains the device address. This means that, for a given connector, any disk drive that is fitted to that connector will have the same SCSI address.

Fitting a replacement drive

Warning

The drive and tray require very accurate assembly or damage can be caused to the connections. This is done in the factory using special equipment. Damage may be caused by inaccurate assembly on site, which may invalidate your warranty.

 1. Carefully unpack the new, ready assembled drive and tray from its protective packaging.

Avoid touching the electronic control board or the connectors at the rear of the drive.

2. Ensure that the release handle on the tray is turned anti-clockwise as far as it will go.

3. Insert the tray into the drive module and push it carefully in until it reaches the point where the hard disk release handle will engage. You must not knock or jolt the hard disk drive.

4. Turn the hard disk release handle clockwise almost one complete turn until the tray metalwork is flush with the drive module. This procedure plugs the hard disk into the connectors on the drive module backplane.

Hard Disk Drive Module

The hard disk drive module is the removable metal framework which holds up to four hard disk drives. The server’s disk chamber can accommodate up to five of these modules. Removal of a module will usually only be necessary if the circuit board on the module backplane fails.

Note

You will need to ensure that both side panels are removed before attempting to remove or fit a drive module.

Removing

1. Remove all hard disk drives which may be fitted to the module in question (see "Hard Disk Drive, Removing", earlier in this chapter). Make a careful note of which drive tray is removed from which slot.

2. In the electronics chamber, unplug the data ribbon cable from the connector on the back of the module. The connector is visible through an opening in the centre spine.

Caution

It is vital that you remember the exact cable and connector arrangement of your hard disks, particularly if you are using a RAID (Redundant Array of Independent Disks) configuration. If you fail to restore the arrangement so that all cables and plugs are as they were originally, you risk losing all the data on your hard disks.

1 Hard Disk Module Data Connector 2 Ribbon Cable

Note

One of the connectors, located underneath the cooling fan assembly, is less accessible than the others. If it is difficult to unplug this connector in the electronics chamber, feed the ribbon cable carefully through the centre spine opening. Then unplug the connector in the disk chamber.

Remove the four securing screws, as shown in the following diagram:

1 Empty Disk Drive Module 2 Securing Screws

4. Slide the module gently out. You will feel a little initial resistance as the backplane power connector unplugs from its socket on the centre spine of the server.

Hard Disk Drive Module Backplane

The backplane on a hard disk drive module consists of seven small circuit boards which are fastened with screws to the metal framework and connected to each other by a flexible ribbon cable. The following illustration identifies the various boards on the backplane:

1 Removable Media Drive SCSI Interface Board 4 Data Connector Board 2 Hard Disk Drive Boards 5 Fastening screws 3 Power Distribution Board

Removing

There are two fastening screws for each board except the removable media drive SCSI interface board, which has four. To remove the backplane:

1. Remove all disk drives from the module.

2. Remove the fastening screws from all the boards.

3. Push each of the boards, except the data connector board, towards the interior of the module and manoeuvre it as necessary until it can be freed from the framework.

4. Lift the backplane away.

 

Fitting

1. Manoeuvre the boards of the backplane through the back openings into the interior of the framework so that they can be positioned properly.

2. Fasten all the boards to the module framework as shown in the previous diagram.

Jumper Settings for the Removable Media SCSI Interface Board

Each module backplane contains a removable media SCSI interface board, positioned at the top of the module. However, the removable media drives are now controlled on a SCSI cable direct from the motherboard.

There are two jumpers on the interface board, as shown in the following diagram:

1 SCSI Connector 3 Jumper J1 2 Interface Board 4 Jumper J2

Both jumpers, J1 and J2, must be in the correct positions for the system to work properly, according to the following instructions:

J1 determines whether a delayed spinup occurs in this module. Delayed spinup means that the installed drives will not start spinning simultaneously after you switch the server on. Instead, the drives start one at a time with a specific number of seconds between each one. This delay prevents the excessive power drain that would otherwise occur if all drives started at the same instant. Therefore, this jumper should always be in the enabled position.

J2 determines where the SCSI bus terminates. Set it to the disabled position. It will only ever need to be enabled if the removable media drive bay has to be controlled from this individual SCSI bus.

Refitting the drive module

1. Slide the drive module into place as far as it will go, at the same time guiding the data connector through the opening in the centre spine.

2. Now reach inside the module and push gently on the power circuit board on the backplane to ensure that its connector is seated properly into the power socket on the centre spine.

The power circuit board lies in the centre of the backplane in each module as shown in the following diagram:

Now use the four screws to fasten the module to the subsystem metalwork in the drive chamber.

1 Empty Disk Drive Module 2 Securing Screws

In the electronics chamber, plug the appropriate ribbon cable onto the data connector on the backplane of the drive module:

1 Hard Disk Module Data Connector 2 Ribbon Cable

Caution

It is vital that you remember the exact cable and connector arrangement of your hard disks, particularly if you are using a RAID (Redundant Array of Independent Disks) configuration. If you fail to restore the arrangement so that all cables and plugs are as they were originally, you risk losing all the data on your hard disks.