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Removing and Replacing Parts

Dell™ PowerVault™ 220S and 221S Systems Service Manual

	Parts Replacement Procedures		Removing and Installing the Split-Bus Module
	Recommended Tools		Replacing a Power Supply
	Removing and Installing Hard Drives		Replacing a Cooling Module
	Removing and Installing EMMs and the SCSI Terminator Card		Replacing the SCSI Backplane

Parts Replacement Procedures

This section provides procedures for removing and replacing components and assemblies in your storage system:

Unless otherwise noted, each procedure assumes the following conditions:

• You have read the safety instructions in your System Information document. Always follow the instructions closely. While working on the system, do not attempt to service the system except as explained in this guide and elsewhere in Dell documentation.
  
  
• You can replace or reinstall a part by performing the removal procedure in reverse order, unless additional information is provided.

Recommended Tools

Most of the procedures in this section require the use of one or more of the following tools:

• #2 Phillips-head screwdriver
  
  
• Wrist grounding strap, as explained in the safety instructions found in your System Information document

Removing and Installing Hard Drives

Your storage system features a SCSI backplane that greatly simplifies cabling and configuration of SCSI hard drives. The SCSI backplane configures all SCSI IDs.

When used in combination with a host RAID controller that supports hot-pluggable drives, the SCSI backplane allows you to remove and insert hard drives without shutting down the storage system. This means that you can replace a failed drive without requiring network users to log off, thus avoiding potential loss of time and data. For more information about whether your RAID controller supports hot-plugging, see the documentation that came with the card.

NOTICE: If the storage system is connected to a supported RAID controller, you can remove and insert SCSI hard drives while the storage system is running. However, hot-plugging hard drives without a supported card could result in data loss. See your RAID controller documentation to ensure that the host adapter is configured correctly to support hot-plug hard drive removal and insertion. HBA cards do not support hot-plugging of drives while the system is running. For more information on supported cards, see your system's readme file.

This section describes how to remove and install hard drives in your storage system.

CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document.

NOTICE: Extra care must be taken when handling and storing the hard drives. The carriers provide some protection, but the hard drives can be damaged by rough handling. When removing the hard drives from the storage system, place them on a padded surface. Never drop the hard drives.

Removing Hard Drives

NOTICE: To avoid damage, never leave a drive carrier partially removed from the storage system. Rotating a carrier handle next to an unseated drive carrier will result in serious damage to the unseated drive carrier.

NOTICE: To avoid data loss when removing a hard drive from an active RAID array, you must first use the array management software to prepare the drive for removal. See your array management software documentation for more information.

1. Use your array management software to prepare the drive for removal.
   
   
2. Wait until the LED indicators on the drive carrier stop flashing.
   
   
3. If you have a tower system, open the front bezel using the keylock mechanism on the top of the bezel.

4. Squeeze the release mechanism on the front of the hard-drive carrier (see Figure 9).
   

Figure 9. Installing and Removing Hard Drives

1 chassis face plate 2 carrier guide rail 3 hard-drive carrier handle 4 carrier release mechanism

5. Open the hard-drive carrier handle.
   
   
6. Gently but firmly pull the hard-drive carrier from its slot.
   

NOTE: If the wrong drive is inadvertently removed, your array management software issues a message that a logical disk has failed after I/O has started. For more information about what to do if the wrong drive is removed, see your array management documentation.

Installing Hard Drives

NOTICE: To avoid damage, never leave a drive carrier partially removed or inserted into the storage system. Rotating a carrier handle next to an unseated drive carrier will result in serious damage to the unseated drive carrier.

1. If you are replacing a hard drive in a carrier, perform the following steps to install the new hard drive into the carrier:
   
   
   1. Remove the four screws that secure the hard drive to its carrier (see Figure 10).
      
      
   2. Position the replacement hard drive into the hard-drive carrier with the hard drive's controller board facing the carrier shield.
      
      
   3. Align the hard drive with the carrier by sliding the hard drive against the stop at the back of the carrier.
      
      
   4. Secure the hard drive to the carrier using the four screws removed earlier.
      

Figure 10. Installing the Hard Drive in the Carrier

1 carrier shield 2 screws (4) 3 hard-drive carrier 4 hard drive

2. With the hard-drive carrier handle open, carefully align the channel on the hard-drive carrier guide rail with the appropriate drive slot keying feature on the chassis face plate, and insert the hard drive (see Figure 9).
   
   
3. Push the hard-drive carrier into the slot until the bottom of the open carrier handle makes contact with the chassis face plate.
   
   
4. Rotate the carrier handle to the closed position while continuing to push the carrier into the slot.

The status LED indicator (see Table 2 for description) is a steady green if the hard drive is inserted properly. If the indicator is not illuminated, see "Troubleshooting SCSI Hard Drives."

While the drive rebuilds, the hard-drive carrier LED flashes green twice per second at unequal intervals.

NOTE: For information on adding a hard drive to a storage array, see your array management software documentation.

Removing and Installing EMMs and the SCSI Terminator Card

A system with redundant enclosure management features two EMMs that are designated as primary and secondary and can be configured in either a cluster or joined-bus mode. A system with nonredundant enclosure management consists of one EMM and one SCSI terminator card configured in a joined-bus mode, or two EMMs configured in a split-bus mode. In redundant EMM systems, only one EMM per SCSI bus is active at one time, so only one EMM per SCSI bus can respond to SCSI commands from an initiator.

EMMs and the SCSI terminator card are "warm-pluggable" and can be removed and installed without shutting down the storage system, provided all I/O to the module has ceased.

This section describes how to remove and install EMMs and the SCSI terminator card in your storage system.

NOTE: In a joined-bus or cluster configuration, you must turn off any server nodes connected to the storage system while you replace an EMM.

Removing an EMM or SCSI Terminator Card

1. Turn off the storage system.

This step is optional if I/O activity to the device has ceased.

2. Disconnect the SCSI cable from the EMM.
   
   
3. Using a #2 Phillips-head screwdriver, loosen the captive screw at the top of the EMM or SCSI terminator card (see Figure 11).
   
   
4. Grasp the handle of the module and pull it from the module slot.

NOTE: If you did not turn off power to the storage system in step 1, after the module is removed from the system, the amber shelf-fault indicator will be illuminated until the module is replaced. See Figure 2 for location of the shelf-fault indicator.

Figure 11. Removing and Installing an EMM or SCSI Terminator Card

1 captive screw 2 handle 3 secondary EMM or SCSI terminator card

Installing an EMM or SCSI Terminator Card

1. Carefully insert the EMM or SCSI terminator card into the empty module slot.
   
   
2. Push the module to the back of the slot until it is firmly seated in the backplane connector.
   
   
3. Using a #2 Phillips-head screwdriver, tighten the captive screw at the top of the module to secure the module to the chassis.
   
   
4. Connect the SCSI cable to the EMM.
   
   
5. Using your array management software, check the EMM firmware revision level and update if necessary.

Removing and Installing the Split-Bus Module

Your system comes equipped with one "warm-pluggable" split-bus module which can be removed or replaced with the system powered on, provided that all I/O activity to the module has ceased. However, since the split-bus module is an extension of the backplane, it must be present for proper operation of the system. If you turn on your system without a split-bus module present or the module is removed while the system is powered on, the shelf-fault LED illuminates, and an audible alarm sounds continuously until a split-bus module is inserted. For more information on split-bus module features and functions, see "Split-Bus Module."

This section describes how to remove and install split-bus modules in your storage system.

Removing a Split-Bus Module

1. Turn off the storage system.

This step is optional if I/O activity to the device has ceased.

2. Using a # 2 Phillips-head screwdriver, loosen the captive screw at the top of the split-bus module (see Figure 12).
   
   
3. Grasp the handle of the module and pull it from the module slot.
   

Figure 12. Removing and Installing a Split-Bus Module

1 captive screw 2 handle 3 split-bus module

Installing a Split-Bus Module

1. Depending on your mode of operation, adjust the bus configuration switch to the proper position.

• Up (rack systems) or right (tower systems) for joined-bus mode
  
  
• Center for split-bus mode (both rack and tower systems)
  
  
• Down (rack systems) or left (tower systems) for cluster mode

For more information on these modes, see "Split-Bus Module."

NOTE: To change the SCSI bus mode, you must change the position of the bus configuration switch before turning on the storage system. Changing the position of the bus configuration switch while the system is on will not affect system operation. If you change the configuration, you must first reboot the storage system and then the host server for the changes to take effect. For more information, see your Installation and Troubleshooting Guide.

2. Carefully insert the split-bus module into the empty module slot.
   
   
3. Push the module to the back of the slot until it is firmly seated in the backplane connector (see Figure 12).
   
   
4. Using a #2 Phillips-head screwdriver, tighten the captive screw at the top of the split-bus module to secure the module to the chassis.
   
   
5. If you changed the bus configuration mode after removing the split-bus module, you must reboot the storage system and then reboot the server.

Replacing a Power Supply

Your system supports two combined power supply and cooling modules. While the system is designed to operate normally with only one functional power supply, both cooling modules (with two blowers each) must be present for proper cooling. If only one power supply is needed, a blank must be inserted into the other slot to mount the second cooling module.

NOTICE: The maximum amount of time that power supply and cooling modules may be removed from the system while it is operating is 5 minutes. If power supply and cooling modules are not replaced within 5 minutes, the system begins to overheat. When the system reaches a critical temperature, it shuts down to prevent damage to the system.

The cooling module is securely mounted to the power supply using a hook-and-latch fastening design. This simplifies the removal and installation of cooling modules and power supplies.

Replacing a Power Supply in Systems With Redundant Power Supplies

NOTICE: If you have a system with two power supplies, the power supplies are hot-pluggable. You can install or remove one of the two power supplies while the system is turned on. If you have a system with only one power supply, you must turn off the system before replacing the power supply (see "Replacing a Power Supply in Systems With Nonredundant Power Supplies").

NOTE: When a power supply fails, fan speeds increase to provide additional cooling. In addition, when replacing power supplies, fan speeds also increase until the replacement power supply or power supply blank has been installed.

1. Using the on/off switch, turn off the power on the failed power supply and then disconnect the power cable.
   
   
2. Using a Phillips-head screwdriver, turn the two captive screws counterclockwise to release the power supply and cooling module from the module bay (see Figure 13).

 Figure 13. Replacing the Power Supply (Systems With Redundant Power Supplies)

1 cooling module 2 handle 3 captive screws (2) 4 power supply

CAUTION: The power supply and cooling modules are heavy. Use both hands when removing.

3. Holding the handle on the power supply, carefully pull the power supply and cooling module out of the module bay (see Figure 13).

NOTICE: The power-supply handle is provided to ease the task of pulling the power supply free from the bay. Do not use this handle to carry the storage system.

4. Detach the cooling module from the power supply by depressing the tab on the back of the cooling module and sliding the cooling module back and up (see Figure 14).

Figure 14. Detaching the Cooling Module From the Power Supply

1 tab on back of cooling module 2 cooling module 3 captive screws (2) 4 power supply

5. Attach the cooling module to a new power supply by performing the reverse of step 4.
   
   
6. Carefully slide the new power supply and cooling module into the empty module bay, and push the module all the way to the back of the bay until it is seated in the backplane connector.

The power supply is seated when its front plate is even with the front plate of the adjacent power supply.

NOTE: The power-supply fault indicator (see Figure 8) remains illuminated until you connect the AC power cable to the power supply and turn on the on/off switch.

7. Using a #2 Phillips-head screwdriver, turn the two captive screws clockwise until the new power supply and cooling module are secured in the module bay.
   
   
8. Connect the AC power cable to the new power supply and to an electrical outlet.
   
   
9. Turn on the on/off switch on the new power supply.
   

Replacing a Power Supply in Systems With Nonredundant Power Supplies

To replace the power supply in a system that uses only a single power supply, perform the following steps:

NOTE: When a power supply fails, fan speeds increase to provide additional cooling. In addition, when replacing power supplies, fan speeds also increase until the replacement power supply or power supply blank has been installed.

1. Turn off the on/off switch on the power supply (see Figure 8).
   
   
2. Disconnect the power cable from the electrical outlet and the power supply.
   
   
3. Using a #2 Phillips-head screwdriver, turn the two captive screws counterclockwise to release the power supply and cooling module from the module bay (see Figure 13).

CAUTION: The power supply and cooling modules are heavy. Use both hands when removing.

4. Holding the handle on the power supply, carefully pull the power supply and cooling module out of the module bay.

NOTICE: The power-supply handle is provided to ease the task of pulling the power supply free from the bay. Do not use this handle to carry the storage system.

5. Detach the cooling module from the power supply by depressing the tab on the back of the cooling module and sliding the cooling module back and up.
   
   
6. Attach the cooling module to a new power supply by performing the reverse of step 5.
   
   
7. Carefully slide the new power supply and cooling module into the empty module bay, and push the module all the way to the back of the bay until it is seated in the backplane connector.

The power supply is seated when its front plate is even with the front plate of the adjacent power supply.

8. Using a Phillips-head screwdriver, turn the two captive screws clockwise until the new power supply and cooling module are secured in the module bay.
   
   
9. Connect the AC power cable to the new power supply and to an electrical outlet.
   
   
10. Turn on the on/off switch on the new power supply.

Replacing a Cooling Module

Your system supports two combined power supply and cooling modules. While the system is designed to operate normally with only one functional power supply, both cooling modules (with two blowers each) must be present for proper cooling. If only one power supply is needed, a power-supply blank must be inserted into the other slot to mount the second cooling module.

NOTICE: The maximum amount of time that power supply and cooling modules may be removed from the system while it is operating is 5 minutes. If power supply and cooling modules are not replaced within 5 minutes, the system begins to overheat. When the system reaches a critical temperature, it shuts down to prevent damage to the system.

The cooling module is securely mounted to the power supply or blank using a hook-and-latch fastening design. This design simplifies the removal and installation of cooling modules, power supplies, and blanks.

To replace a cooling module, perform the following steps:

1. If you are replacing a cooling module that is attached to a power supply, first turn off the power on power supply using the on/off switch and disconnect the power cable.
   
   
2. Using a Phillips-head screwdriver, turn the two captive screws counterclockwise to release the power supply or blank and cooling module (see Figure 15) from the module bay.

Figure 15. Replacing a Cooling Module

1 cooling module 2 handle 3 captive screws (2) 4 power supply or blank

CAUTION: The power supply or power supply blanks and cooling modules are heavy. Use both hands when removing.

3. Holding the handle on the power supply or blank, carefully pull the power supply or blank and cooling module out of the module bay.

NOTICE: The handle on the power supply and blank is provided to ease the task of pulling the power supply or blank free from the bay. Do not use this handle to carry the storage system.

4. Detach the cooling module from the power supply or blank by depressing the tab on the back of the cooling module and sliding the cooling module back and up (see Figure 14).
   
   
5. Attach a new cooling module to the power supply or blank by performing the reverse of step 4.
   
   
6. Carefully slide the new power supply or blank and cooling module into the empty module bay, and push the module all the way to the back of the bay until it is seated in the backplane connector.

The power supply or blank is seated when its front plate is even with the front plate of the adjacent power supply.

7. If you are replacing a cooling module that is attached to a power supply, reattach the power cable and turn on the power supply using the on/off switch.

Replacing the SCSI Backplane

The SCSI backplane in your storage system provides an interface for up to fourteen LVD SCSI hard drives, two EMMs, two combined power supply and cooling modules, and one split-bus module. With the exception of redundant temperature sensors and an EEPROM for storing system data, the backplane contains only passive electrical components.

To replace the SCSI backplane in your storage system, perform the following steps:

1. Turn off power to the host system.
   
   
2. Turn off the on/off switch on the power supply (see Figure 8 for location). If you have two power supplies, turn off both.
   
   
3. Remove all hard drives (see "Removing and Installing Hard Drives").
   
   
4. Remove the power supply and cooling modules. If you have two power supplies, remove both (see "Replacing the Power Supply"). If you have one power supply, remove the power-supply blank as well as the power supply.
   
   
5. Remove both EMMs, or remove the EMM and SCSI terminator card in nonredundant EMM systems (see "Removing and Installing EMMs and the SCSI Terminator Card").
   
   
6. Remove the split-bus module (see "Removing and Installing the Split-Bus Module").
   
   
7. Using a #2 Phillips-head screwdriver, unscrew the four screws securing the chassis tray inside the chassis (see Figure 16).

Figure 16. Removing Chassis Tray

1 Chassis tray 2 Screws (4)

8. Remove the chassis tray from the system and set it aside.
   
   
9. Facing the rear of the system, grasp the connectors in the middle of the SCSI backplane and pull straight back approximately 1 inch so that the backplane alignment holes clear the alignment pins at the lower left and top right corners (see Figure 17).
   
   Lay the backplane flat as you pull it from the chassis. Set the backplane aside.

Figure 17. Removing the SCSI Backplane

1 backplane alignment holes 2 alignment pins 3 SCSI backplane 4 SCSI backplane connectors

10. To install the new backplane, position the replacement backplane so that the 14 SCSI connectors are facing the front of the system and the two power supply and cooling module connectors are facing the back.
    
    
    
11. Lay the backplane flat as you slide it into the chassis. Slide the backplane all the way into the chassis until the two alignment holes at the lower left and top right corners are seated firmly on the two alignment pins.
    
    
12. Replace chassis tray, making sure that the tray is seated on the alignment pins that secure the backplane.
    
    

13. Replace the screws you removed in step 7.
    
    

14. Replace the split-bus module. See "Removing and Installing the Split-Bus Module."
    
    

15. Replace the EMM(s) and/or SCSI terminator card. See "Removing and Installing EMMs and the SCSI Terminator Card."
    
    

16. Replace the power supply and cooling modules. If you have two power supplies, replace both (see "Replacing the Power Supply"). If you have one power supply, replace the power supply blank as well as the power supply.
    
    

17. Replace the hard drives. See "Removing and Installing Hard Drives."
    

18. Reconnect the SCSI cable(s) and power cables.
    
    

19. Turn on power to the storage system. (If you have two power supplies, turn on both).
    
    

20. Turn on power to the host system.
    

21. Use your array management software to restore temperature defaults and service tag data. For more information, see your array management documentation.
    

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