Removing and replacing the support rails
You can remove and replace faulty support rails on 2U expansion enclosures.
Before you begin
CAUTION:

Procedure
Remove the support rails
- Identify the enclosure whose rails are to be replaced.
- Shut down the system by following the appropriate procedure.
- Remove the power cords from the back of the enclosure.
- Ensure that you identify which port each cable connects to; then, remove all cables from the back of the enclosure that has faulty support rails.
- Remove the end caps from the front flanges of the enclosure by following the removal instructions in Removing and replacing the end caps: 2145-12F or 2145-24F.
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Unscrew the M5 screw from the left flange.
Repeat with the M5 screw in the right flange.
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Slide the enclosure from the rack.
Notes: The weight of the enclosure can be reduced below 18 kg by first labeling and removing each canister, drive assembly, and power supply unit from the enclosure.
- Ensure that all components are labeled such that they can be replaced in the same slots from which they are removed.
- Set each component aside in a safe location.
- Never apply physical shock to a drive assembly, as it might damage the drive or the data on it.
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Locate the left support rail.
Record the shelf number of the support rail so that the replacement rails can be installed into the same position.
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At the rear of the rack, remove the securing M5 screw from the bottom hole of the rear
bracket of the rail, then open the rear hinge bracket (Figure 1).
Figure 1. Opening rear hinge bracket of mounting rail 
- At the front of the rack, hold onto the rail and open the front hinge bracket.
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Compress the rail against its spring to shorten it, then remove it from inside the rack
(Figure 2).
Figure 2. Compressing rail for removal from rack 
- Repeat steps 9 to 11 on the right support rail.
Replace the support rails
- Install the new support rails at the rack position that is recorded at step 8. Follow the instructions in Installing support rails for 2U SAS expansion enclosures ( SAN Volume Controller 2145-SV1 and SAN Volume Controller 2145-DH8 only).
- Reinstall the enclosure (removed at step 7), as described in Removing and replacing the expansion canister.
- Replace the end caps (removed at step 5), as described in Removing and replacing the end caps: 2145-12F or 2145-24F.
- If components were removed from the enclosure at step 7, return each canister, drive assembly, and power supply unit to its labeled slot.
- Reconnect the cables, ensuring that they are connected to their original ports.
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Reconnect the power supply cables to their original power supply and electrical
outlet.
The system starts.
- After the system is online, use the management GUI to verify that the system is correct.