1. A heater wire comprising:
a plurality of heating elements twisted together to form a twisted set of heating elements; and
an insulating sheath formed on an outer peripheral surface of the twisted set; and
wherein each one heating element among said plurality of heating elements consists of a core wire and a rectangular wire spirally wound around the core wire.
2. The heater wire according to claim 1, wherein a direction in which the rectangular wire is wound and a direction in which the heating element wires are twisted are opposite.
3. The heater wire according to claim 2, wherein the plurality of heating elements twisted together form a structure having a central portion that is a first hollow space, the first hollow space being surrounded by the plurality of heating elements, and wherein a plurality of second hollow spaces are formed in a valley surrounded by adjacent heating element wires and the insulating sheath.
4. A heater wire comprising:
a plurality of heating elements twisted together; and
an insulating sheath formed on an outer peripheral surface of the twisted heating elements; and
wherein each one heating element among said plurality of heating elements consists of a core wire and an insulation-coated rectangular wire spirally wound around the core wire.
5. The heater wire according to claim 4, wherein a direction of the insulation-coated rectangular wire is wound and a direction in which the heating elements are twisted are opposite.
6. The heater wire according to claim 4, wherein the plurality of heating elements twisted together form a structure having a central portion that is a first hollow space, the first hollow space being surrounded by the plurality of heating elements, and wherein a plurality of second hollow spaces are formed in a valley surrounded by adjacent heating element wires and the insulating sheath.
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 method, comprising:
dividing data into a first data block and a second data block by a computing device executing a reliable cloud storage module;
sending the first data block to a first storage cloud provided by a first storage service;
sending the second data block to a second storage cloud provided by a second storage service;
receiving a request to read the data by the computing device;
retrieving the first data block from the first storage cloud and the second data block from the second storage cloud; and
reproducing the data from the first data block and the second data block.
2. The method of claim 1, further comprising:
generating a parity block from the first data block and the second data block; and
sending the parity block to a third storage cloud.
3. The method of claim 2, further comprising:
encrypting the first data block using a first encryption key associated with the first storage cloud; and
encrypting the second data block using a second encryption key associated with the second storage cloud.
4. The method of claim 3, wherein the parity block is generated from the first data block and the second data block after the first data block and the second data block have been encrypted.
5. The method of claim 3, wherein the parity block is generated from the first data block and the second data block before the first data block and the second data block have been encrypted, the method further comprising:
encrypting the parity block using a third encryption key associated with the third storage cloud.
6. The method of claim 3, further comprising:
receiving the request to read the data while the first storage cloud is unresponsive;
retrieving the second data block from the second storage cloud and the parity block from the third storage cloud; and
rebuilding the first data block from the second data block and the parity block.
7. The method of claim 2, further comprising:
detecting that one of the first storage cloud, the second storage cloud or the third storage cloud has become unresponsive;
temporarily caching the first data block, the second data block or the parity block that is to be sent to the unresponsive storage cloud; and
upon establishing a connection to the unresponsive storage cloud, synchronizing contents of the unresponsive storage cloud to contents of the remaining storage clouds by sending the first data block, the second data block or the parity block to the unresponsive storage cloud.
8. The method of claim 1, further comprising:
sending the first data block to a third storage cloud provided by a third storage service, wherein the third storage cloud mirrors the first storage cloud; and
sending the second data block to a fourth storage cloud provided by a fourth storage service, wherein the fourth storage cloud mirrors the second storage cloud.
9. A computer readable storage medium including instructions that, when executed by a processing device, cause the processing device to perform a method, comprising:
dividing data into a first data block and a second data block by the computing device;
sending the first data block to a first storage cloud provided by a first storage service;
sending the second data block to a second storage cloud provided by a second storage service;
receiving a request to read the data;
retrieving the first data block from the first storage cloud and the second data block from the second storage cloud; and
reproducing the data from the first data block and the second data block.
10. The computer readable storage medium of claim 9, the method further comprising:
generating a parity block from the first data block and the second data block; and
sending the parity block to a third storage cloud.
11. The computer readable storage medium of claim 10, the method further comprising:
encrypting the first data block using a first encryption key associated with the first storage cloud; and
encrypting the second data block using a second encryption key associated with the second storage cloud.
12. The computer readable storage medium of claim 11, wherein the parity block is generated from the first data block and the second data block after the first data block and the second data block have been encrypted.
13. The computer readable storage medium of claim 11, wherein the parity block is generated from the first data block and the second data block before the first data block and the second data block have been encrypted, the method further comprising:
encrypting the parity block using a third encryption key associated with the third storage cloud.
14. The computer readable storage medium of claim 11, the method further comprising:
receiving the request to read the data while the first storage cloud is unresponsive;
retrieving the second data block from the second storage cloud and the parity block from the third storage cloud; and
rebuilding the first data block from the second data block and the parity block.
15. The computer readable storage medium of claim 10, the method further comprising:
detecting that one of the first storage cloud, the second storage cloud or the third storage cloud has become unresponsive;
temporarily caching the first data block, the second data block or the parity block that is to be sent to the unresponsive storage cloud; and
upon establishing a connection to the unresponsive storage cloud, synchronizing contents of the unresponsive storage cloud to contents of the remaining storage clouds by sending the first data block, the second data block or the parity block to the unresponsive storage cloud.
16. The computer readable medium of claim 9, the method further comprising:
sending the first data block to a third storage cloud provided by a third storage service, wherein the third storage cloud mirrors the first storage cloud; and
sending the second data block to a fourth storage cloud provided by a fourth storage service, wherein the fourth storage cloud mirrors the second storage cloud.
17. A storage appliance, comprising:
a memory to store instructions for a reliable cloud storage module; and
a processing device, connected with the memory, to execute the instructions, wherein the instructions cause the processing device to:
divide data into a first data block and a second data block;
send the first data block to a first storage cloud provided by a first storage service;
send the second data block to a second storage cloud provided by a second storage service;
retrieve the first data block from the first storage cloud and the second data block from the second storage cloud upon receipt of a request to read the data; and
reproduce the data from the first data block and the second data block.
18. The storage appliance of claim 17, further comprising the instructions to cause the processing device to:
generate a parity block from the first data block and the second data block; and
send the parity block to a third storage cloud.
19. The storage appliance of claim 18, further comprising the instructions to cause the processing device to:
encrypt the first data block using a first encryption key associated with the first storage cloud; and
encrypt the second data block using a second encryption key associated with the second storage cloud.
20. The storage appliance of claim 19, wherein the parity block is generated from the first data block and the second data block after the first data block and the second data block have been encrypted.
21. The storage appliance of claim 19, wherein the parity block is generated from the first data block and the second data block before the first data block and the second data block have been encrypted, the instructions further to cause the processing device to:
encrypt the parity block using a third encryption key associated with the third storage cloud.
22. The storage appliance of claim 19, the instructions further to cause the processing device to:
receive the request to read the data while the first storage cloud is unresponsive;
retrieve the second data block from the second storage cloud and the parity block from the third storage cloud; and
rebuild the first data block from the second data block and the parity block.
23. The storage appliance of claim 18, the instructions further to cause the processing device to:
detect that one of the first storage cloud, the second storage cloud or the third storage cloud has become unresponsive;
temporarily cache the first data block, the second data block or the parity block that is to be sent to the unresponsive storage cloud; and
upon establishing a connection to the unresponsive storage cloud, synchronize contents of the unresponsive storage cloud to contents of the remaining storage clouds by sending the first data block, the second data block or the parity block to the unresponsive storage cloud.
24. The storage appliance of claim 18, further comprising the instructions to cause the processing device to:
send the first data block to a third storage cloud provided by a third storage service, wherein the third storage cloud mirrors the first storage cloud; and
send the second data block to a fourth storage cloud provided by a fourth storage service, wherein the fourth storage cloud mirrors the second storage cloud.