Installing and Removing Components

Figure 3-1 shows the positions of the I/O module, power supplies, and disk drives within the chassis. Figure 3-2 shows the ACMs and VEM. The I/O module occupies bay 0, the disk drives bays 1 to 6, and the power supplies bays 7 and 8.

Figure 3-1: Components of the Storage Array (Split-Bus Mode)—Front View

Figure 3-2: Components of the Storage Array (AC Power)—Rear View

Warning Before attempting to install or remove any of the components, ensure that antistatic precautions have been taken. The minimum requirement is an antistatic wrist strap and properly grounded grounding wire.

Caution We recommend that all host activity be stopped during insertion or removal of devices.

Caution Allow disk drives and power supplies to reach room ambient temperature before powering on the Storage Array.

Power Supply Insertion and Removal

Power supplies are housed in removable carriers to allow for easy insertion and removal. The power supplies are hot-swappable. If removing and replacing the same power supply, make sure that at least 1 minute has elapsed between removal and reinsertion to allow components to cool to ambient temperatures. The power supplies use temperature-sensitive current limiting. As the temperature of the power supply increase, the current-limiting function decreases, preventing undesirable surges.

Inserting a Power Supply

Step 1 Orient the power supply carrier so that the LEDs are at the bottom and the ejection button is at the top.

Step 2 Insert the power supply carrier into either of the far right slots of the chassis—bays 7 and 8. (See Figure 3-1.)

Step 3 Push the carrier into the bay until you feel the power supply engage the backplane and the ejection button on the front is fully extended. If the button is not fully extended, apply additional pressure to the front of the device carrier.

Removing a Power Supply

Step 1 Press the ejection button on the front of the power supply.

Step 2 With the ejection button still pressed, grasp the carrier handle and slowly pull the power supply out of the chassis. Use both hands to support the weight of the power supply.

Disk Drive Insertion and Removal

Disk drives should be idle when inserted or removed, although the SCSI bus can have active I/O processes running for other devices. If possible, ensure that the disk drive has stopped spinning before removing it from the bay, because centrifugal forces may damage the drive. Allow a minimum of 1 minute for the drive to stop spinning. Take precautions to prevent electrical shock.

True SCSI disk drive hot swapping must be supported by the host software. SCSI hot swapping software support enables the host to reconfigure system I/O parameters when a drive is added, removed, or swapped.

Note The individual disk drive slot rating is 5 VDC at 2.03A or 12 VDC at 2.06A.

Caution Removing a disk drive engaged in I/O activity may damage
the drive.

Inserting a Disk Drive

Step 1 Orient the disk drive carrier so that the LEDs are at the bottom and the ejection button is at the top.

Step 2 Insert the disk drive carrier into any of bays 1 through 6 of the chassis. (See
Figure 3-1.)

Step 3 Push the carrier into the bay until you feel the disk drive engage the backplane and the ejection button on the front is fully extended. If the button is not fully extended, apply additional pressure to the front of the carrier.

Removing a Disk Drive

Step 1 Press the ejection button on the front of the disk drive carrier.

Step 2 With the ejection button still pressed, grasp the carrier handle and slowly pull the disk drive out of the chassis. Use both hands to support the weight of the disk drive.

Caution Reinsert a removed drive in the same slot from which it was removed, or data on the drive will be lost.

Advanced Cooling Module Insertion and Removal

The Storage Array is equipped with three Advanced Cooling Modules (ACMs) mounted on the rear of each array. The ACMs are removable and hot-swappable. The airflow created by the ACMs is from front to rear. The minimum requirement is two operational ACMs. The third ACM provides full redundancy for the
cooling system.

Caution Once you have removed an ACM from the chassis or array you must block the resulting hole within 3 minutes. The hole may be blocked by installing a new ACM or by inserting the failed ACM until a replacement is obtained. Failure to do so can seriously disrupt airflow and operating temperature.

Inserting an ACM

Step 1 Hold the ACM assembly horizontal to the chassis.

Step 2 Insert the ACM into an empty ACM slot.

Step 3 Align the two screws on the ACM with the threaded holes on the chassis.

Step 4 Tighten the screws.

Removing an ACM

Step 1 Loosen the two captive screws that secure the ACM to the chassis.

Step 2 Slowly pull the ACM assembly out of the chassis by the ACM handle.

Versatile Environmental Monitor Insertion and Removal

The Versatile Environmental Monitor (VEM) is an environmental monitoring SCSI device that inserts into the backplane of the Storage Array. It monitors the disk drives, power supplies, ACMs, and enclosure temperature. See "Environmental Monitoring and LED Diagnostics," for further information
on the VEM.

Inserting a VEM

Step 1 Ensure that the power to the Storage Array has been turned off.

Step 2 Insert the VEM into the VEM slot on the rear of the chassis.

Step 3 Press the VEM firmly into place to ensure that a good connection is made between the connector on the VEM and the connector on the backplane.

Step 4 Align the two screws on the VEM with the holes on the rear of the chassis.

Step 5 Tighten the screws.

Removing a VEM

Step 1 Switch off the power to the array, ensuring that there is no activity on the SCSI bus.

Step 2 Loosen the two screws on the VEM.

Step 3 Slowly pull the VEM out of the chassis by its handle.

I /O Module Insertion and Removal

The I/O module is housed in a device carrier to allow for easy insertion and removal. To insert or remove the I/O module, use the supplied carrier key to turn the lead-screw.

Inserting an I/O Module

Step 1 Orient the I/O module carrier so that the keyhole is at the top.

Step 2 Insert the key into the keyhole and insert the I/O module into the far left bay of the Storage Array (bay 0).

Step 3 Turn the key clockwise to lock the I/O module into position.

Step 4 Install the lead-screw lock in the keyhole.

Note The lead-screw lock is a plastic plug that fits over the lead-screw to prevent the lead-screw from loosening if it is subject to vibration.

Removing an I/O Module

Caution Before removing an I/O module, ensure that all I/O activity of the Storage Array has stopped.

Step 1 Switch off the power to the Storage Array.

Step 2 Remove the lead-screw lock.

Step 3 Insert the supplied carrier key into the keyhole on the module carrier.

Step 4 Turn the key anticlockwise to disengage the carrier from the chassis.

Step 5 Slowly pull the carrier out of the chassis.

Connecting the Storage Array to a Power Source

The Storage Array can be equipped with either AC or DC power supplies. The following sections describe the procedure for connecting the Storage Array to a power source.

Connecting to an AC Power Source

Step 1 Ensure that the power switch on the Storage Array is in the off position.

Step 2 Connect the AC power cords to the AC power receptacles of the Storage Array power supply units.

Step 3 Plug the other end of each AC power cord into a properly grounded AC power source.

Step 4 Move the power switch to the on position to power on the Storage Array.

Connecting to a DC Power Source

Step 1 Ensure that the power switch on the Storage Array is in the off position.

Step 2 Insert positive power leads into the positive (+) terminals on the Storage Array DC power connectors (one lead per terminal).

Step 3 Insert negative power leads into the negative (-) terminals on the Storage Array DC power connectors (one lead per terminal).

Step 4 Secure the leads by tightening the screws on the Storage Array DC power connectors.

Step 5 Connect the other ends of the leads to the DC power source.

Make sure to secure the positive leads to a positive terminal, and the negative leads to a negative terminal.

Step 6 Move the power switch to the on position to power on the Storage Array.

Caution The Storage Array should be connected to 48 VDC on a branch circuit breaker rated for 20A.

Caution A disconnect device for the equipment must be provided in a convenient location, either for the installation site or in the
branch circuit.

Table of Contents

Installing and Removing Components