Electronics rack with a movable power distribution unit

1. A rack for housing electronic components with a movable power distribution unit (PDU), comprising:

a rack housing configured to accommodate a plurality of electronic components;

a first PDU configured to supply electrical power to the plurality of electronic components;

an attachment mechanism configured to slidably mount the first PDU to the rack housing so that the first PDU can slide to create an access space to facilitate a maintenance operation while the first PDU continues to supply power to the plurality of electronic components;

a second PDU fixedly attached to the rack housing and also configured to supply power to the plurality of electrical components,

wherein the second PDU is an inner PDU which is located closer to the plurality of electronic components than the first PDU;

wherein when the first PDU is in a normal-operating position abutting to the rack housing, the first PDU restricts access to the second PDU; and

wherein slidably moving the first PDU away from the normal-operating position creates the access space between the first PDU and the rack housing to facilitate a maintenance operation for the second PDU, wherein the second PDU remains fixedly attached to the rack housing while the first PDU slidably moves away from the rack housing to create the access space between the first PDU and the rack housing.

2. The rack of claim 1 , wherein the access space created by moving the first PDU allows the second PDU to be replaced while the first PDU continues to supply power to the plurality of electronic components.

3. The rack of claim 1 , wherein the attachment mechanism includes:

a sliding bracket configured to attach to the first PDU; and

a rail system connected to the sliding bracket, wherein the rail system enables the sliding bracket to slide to create the access space to facilitate the maintenance operation.

4. The rack of claim 1 , wherein the attachment mechanism includes a fastener configured to fasten the first PDU in a normal-operating position.

5. The rack of claim 1 , wherein the plurality of electronic components includes one or more of the following:

server blades;

networking components;

storage devices; and

telecommunications components.

6. The rack of claim 1 , wherein the first PDU includes:

electrical outlets for supplying power to the plurality of electronic components; and

one or more circuit breakers for the electrical outlets.

7. A computer system including a rack for housing electronic components with a movable power distribution unit (PDU), comprising:

a plurality of computer system components including one or more processors and a memory;

a rack housing configured to accommodate the plurality of computer system components;

a first PDU configured to supply electrical power to the plurality of computer system components;

an attachment mechanism configured to slidably mount the first PDU to the rack housing so that the first PDU can slide to create an access space to facilitate a maintenance operation while the first PDU continues to supply power to the plurality of electronic components;

a second PDU fixedly attached to the rack housing and also configured to supply power to the plurality of computer system components,

wherein the second PDU is an inner PDU which is located closer to the plurality of computer system components than the first PDU;

wherein when the first PDU is in a normal-operating position abutting to the rack housing, the first PDU restricts access to the second PDU; and

wherein slidably moving the first PDU away from the normal-operating position creates the access space between the first PDU and the rack housing to facilitate a maintenance operation for the second PDU, wherein the second PDU remains fixedly attached to the rack housing while the first PDU slidably moves away from the rack housing to create the access space between the first PDU and the rack housing.

8. The computer system of claim 7 , wherein the access space created by moving the first PDU allows the second PDU to be replaced while the first PDU continues to supply power to the plurality of computer system components.

9. The computer system of claim 7 , wherein the attachment mechanism includes:

a sliding bracket configured to attach to the first PDU; and

a rail system connected to the sliding bracket, wherein the rail system enables the sliding bracket to slide to create the access space to facilitate the maintenance operation.

10. The computer system of claim 7 , wherein the attachment mechanism includes a fastener configured to fasten the first PDU in a normal-operating position.

11. The computer system of claim 7 , wherein the plurality of computer system components can include one or more of the following:

server blades;

storage devices; and

computer networking components.

12. The computer system of claim 7 , wherein the first PDU includes:

electrical outlets for supplying power to the plurality of computer system components; and

one or more circuit breakers for the electrical outlets.

13. An apparatus that facilitates moving a power distribution unit (PDU) within a rack housing containing electronic components, comprising:

an attachment mechanism configured to slidably mount a first PDU to the rack housing so that the first PDU can slide to create an access space to facilitate a maintenance operation while the first PDU continues to supply power to a plurality of electronic components located within the rack housing;

wherein the rack is also attached to a second PDU that is fixedly attached to the rack housing and also configured to supply power to the plurality of electrical components;

wherein the second PDU is an inner PDU which is located closer to the plurality of electronic components than the first PDU;

wherein when the first PDU is in a normal-operating position abutting to the rack housing, the first PDU restricts access to the second PDU; and

wherein slidably moving the first PDU away from the normal-operating position creates the access space between the first PDU and the rack housing to facilitate a maintenance operation for the second PDU, wherein the second PDU remains fixedly attached to the rack housing while the first PDU slidably moves away from the rack housing to create the access space between the first PDU and the rack housing.

14. The apparatus of claim 13 , wherein the access space created by moving the first PDU allows the second PDU to be replaced while the first PDU continues to supply power to the plurality of electronic components.

15. The apparatus of claim 13 , wherein the attachment mechanism includes:

a sliding bracket configured to attach to the first PDU; and

a rail system connected to the sliding bracket, wherein the rail system enables the sliding bracket to slide to create the access space to facilitate the maintenance operation.

16. The apparatus of claim 13 , wherein the attachment mechanism includes a fastener configured to fasten the first PDU in a normal-operating position.

17. The apparatus system of claim 13 , wherein the plurality of electronic components includes one or more of the following:

server blades;

networking components;

storage devices; and

telecommunications components.