1. A method for storage allocation in a storage system, the method comprising:
generating a request for storage space allocation in a particular storage device by a first node;
determining an owner node associated with the particular storage device by a first allocation client associated with the first node;
sending the request by the first allocation client to a second allocation client associated with the owner node; and
creating a storage device allocation region of the particular storage device, the allocation region comprising an area defined by a height proportional to storage devices the owner node and the second allocation client are coupled with, and a width that is inversely proportional to a number of nodes sharing the particular storage device.
2. The method of claim 1, further comprising:
sending an ownership request for the allocation region from the second allocation client to an allocation manager.
3. The method of claim 2, further comprising:
determining whether the allocation region is available by the allocation manager; and
sending an ownership status message to the second allocation client based on the determination.
4. The method of claim 3, wherein upon the allocation manager determining the allocation region is available, sending an ownership granted message to the second allocation client.
5. The method of claim 4, further comprising:
upon receiving the ownership granted message, the second allocation client reserving the allocation region.
6. The method of claim 5, further comprising:
the second allocation client responding to the first allocation client with the reserved allocation region.
7. The method of claim 1, wherein upon the first node being the owner node, the first allocation client and the second allocation client are the same.
8. The method of claim 7, wherein only one owner node is associated with the particular storage device.
9. The method of claim 1, wherein the storage system comprises a cluster file system, and the particular storage device comprises a storage disk.
10. The method of claim 9, wherein the storage space allocation and free space management is adaptive for node-disk connectivity based on an allocation map layout.
11. The method of claim 10, wherein the allocation map layout includes divided disk regions based on a number of nodes that share a disk and a number of disks connected to a particular node.
12. A storage system comprising:
a plurality of storage devices;
a first compute node that generates a request for storage space allocation in a particular one of the plurality of storage devices;
a first allocation client that determines an owner node that owns the particular storage device, and sends the request for storage space to a second allocation client associated with the owner node; and
a storage allocation manager that creates an allocation region in the particular storage device, wherein the allocation region comprises an area defined by a height proportional to storage devices the owner node and the second allocation client are coupled with, and a width that is inversely proportional to a number of nodes sharing the particular storage device.
13. The system of claim 12, wherein the second allocation client sends an ownership request for the allocation region to the allocation manager, the allocation manager determines whether the allocation region is available, and the allocation manager sends an ownership status message to the second allocation client.
14. The system of claim 13, wherein upon receiving an ownership granted message, the second allocation client reserves the allocation region and responds to the first allocation client with the reserved allocation region.
15. The system of claim 12, wherein the storage system comprises a cluster file system, and the particular storage device comprises a storage disk.
16. The system of claim 15, wherein the storage allocation manager provides adaptive storage space allocation and free space management for node-disk connectivity based on an allocation map layout, wherein the allocation map layout includes divided disk regions based on a number of nodes that share a disk and a number of disks connected to a particular node.
17. A non-transitory computer-useable storage medium for storage allocation in a storage system, the computer-useable storage medium having a computer-readable program, wherein the program upon being processed on a computer causes the computer to implement:
generating a request for storage space allocation in a particular storage device by a first node;
determining an owner node associated with the particular storage device by a first allocation client associated with the first node;
sending the request by the first allocation client to a second allocation client associated with the owner node; and
creating a storage device allocation region of the particular storage device, the allocation region comprising a height proportional to storage devices the owner node and the second allocation client are coupled with, and a width that is inversely proportional to a number of nodes sharing the particular storage device.
18. The program of claim 17, further causing the computer to implement:
sending an ownership request for the allocation region from the second allocation client to an allocation manager;
determining whether the allocation region is available by the allocation manager; and
sending an ownership status message to the second allocation client based on the determination wherein upon the allocation manager determining the allocation region is available, sending an ownership granted message to the second allocation client.
19. The program of claim 18, further causing the computer to implement:
upon receiving the ownership granted message, reserving the allocation region by the second allocation client; and
responding to the first allocation client with the reserved allocation region by the second allocation client.
20. The program of claim 18, further causing the computer to implement:
adaptive the storage space allocation and free space management for node-disk connectivity based on an allocation map layout, wherein the allocation map layout includes divided disk regions based on a number of nodes that share a disk and a number of disks connected to a particular node.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A switched mode power converter adapted for zero-voltage transition operation, wherein the converter comprises
a half-bridge, having a first power switch (206) and a second power switch,
a generator (201) adapted for generating a switching signal (S1) after a first period of time, wherein the first period of time starts at the switching off of the second power switch,
a controller (202) for converting the switching signal (S1) into a control signal (S2), wherein the first power switch (206) is switched on in case of the control signal (S2), wherein
the controller (202) comprises
a detector (205), wherein the detector (205) is adapted to generate a first signal (S3) in case the voltage (U+, U\u2212) over the first power switch (206) is decreasing,
a processor (203), wherein the processor (203) is adapted to generate a trigger signal (S4) in case of a switching signal (S1) and while the first signal (S3) is not present,
a storage element (204), wherein the storage element (204) is adapted to generate the control signal (S2) in case of the trigger signal (S4) and the switching signal (S1), wherein the storage element (204) is adapted to keep the control signal (S2) after disappearing of the trigger signal (S4), wherein the storage element (204) is adapted to terminate the control signal (S2) after disappearing of the switching signal (S1).
2. The converter according to claim 1, wherein the storage element (204) is a latch.
3. The converter according to claim 1, wherein the storage element (204) is a bistable multivibrator, especially a flip-flop.
4. The converter according to claim 1, wherein
the converter comprises
a first delayer for generating a first dead-time such as there is a the period of time between the switching on of the first power switch (206) and the switching off of the second power switch.
5. The converter according to claim 1, wherein
the converter comprises
a second delayer for generating a second dead-time such that the voltage (U+, U\u2212) over the first power switch (206) falls to zero before the first power switch (206) is turned on.
6. The converter according to claim 1 wherein the first period of time
is longer than the time period from a change of the control signal (52) until the first power switch (206) has changed its conduction state,
is shorter than the time period starting with the disappearance of the switching signal (S1) and ending with the first minimum voltage of the first power switch (206) during zero voltage transition operation.
7. The converter according to claim 1 wherein the first period of time is in the range of 10 to 5000 ns.
8. The converter according to claim 1, wherein the converter is a part of a DCAC converter for supplying a resonant circuit and a transformer of a high voltage generator for x-ray applications.
9. A method for controlling a switched mode power converter adapted for zero-voltage transition operation, wherein the converter comprises a half-bridge, having a first power switch (206) and a second power switch, wherein
the method comprises the steps of
generating a switching signal (S1) after a first period of time, wherein the first period of time starts at the switching off of the second power switch,
converting the switching signal (Si) into a control signal (S2), wherein the first power switch (206) is switched on in case of the control signal (S2), wherein
the method comprises the steps of
generating a first signal (53) in case the voltage (U+, U-) over the first power switch (206) is decreasing,
generating a trigger signal (S4) in case of a switching signal (S1) and while the first signal (S3) is not present,
generating the control signal (S2) in case of the trigger signal (S4) and the switching signal (S1), wherein the storage element (204) is adapted to keep the control signal (52) after disappearing of the trigger signal (S4), wherein the storage element (204) is adapted to terminate the control signal (S2) after disappearing of the switching signal (S1).
10. A computer tomography system comprising a converter according to claim 1.
11. A programme element, which, when being executed by a processor, is adapted to carry out the method of claim 9.
12. A computer readable medium having stored the programme element of claim 11.