Method and apparatus to support multi-node direct write access to a file managed by a single node file system
View Patent ↗Disclosed is a method and apparatus for supporting direct write access from many nodes of a multi-mode network to a file managed by a single node file system. The network includes first and second nodes coupled to each other via a first communication link, and a peripheral data storage device coupled to the first and second nodes via a second communication link. In one embodiment, the method includes the first node receiving data. The first node transmits a first message to the second node via the first communication link in response to the first node receiving the data. A software module such as a single node file system, executing on the second node, allocates storage memory of the peripheral data storage device for the data received by the first node in response to the second node receiving the first message. The first node writes the data to the allocated storage memory via the second communication link such that the data is written to the allocated storage memory without the data first transmitting through the first communication link.
1. In a network comprising first and second nodes coupled to each other via a first communication link, and a peripheral data storage device coupled to the first and second nodes via a second communication link, a method comprising:
the first node receiving data;
the first node transmitting a first message to the second node via the first communication link in response to the first node receiving the data;
a single node file system, executing on the second node, allocating storage memory of the peripheral data storage device for the data received by the first node in response to the second node receiving the first message; and
the first node writing the data to the allocated storage memory via the second communication link;
wherein the first node writes the data to the allocated storage memory without the data first transmitting through the first communication link.
2. The method of claim 1 further comprising:
a first software module, executing on the first node, determining whether storage memory of the peripheral data storage device has been previously allocated to store the data; and
the first node transmitting the first message to the second node in response to the first software module determining that storage memory of the peripheral data storage device has not been previously allocated to store the data.
3. The method of claim 2 wherein the first message comprises information identifying a quantity of storage memory in the peripheral data storage device to be allocated.
4. The method of claim 3 wherein the first message comprises information representing an identification of a file created by the single node file system.
5. The method of claim 4 wherein the first message comprises information representing an address within the file where the data is to be written.
6. The method of claim 2 wherein the first message comprises information representing the quantity of the data.
7. The method of claim 1 wherein the second message comprises information identifying the storage memory allocated in the peripheral data storage device.
8. The method of claim 4 wherein the first message comprises information representing an offset within the file where the data is to be written.
9. The method of claim 2 wherein the first node compares an address of a file where the data is to be written with meta data corresponding to the file in order to determine whether storage memory of the peripheral data storage device has been previously allocated to the address.
10. The method of claim 1 further comprising the single node file system modifying meta data of a file in response to the single node file system allocating storage memory in the peripheral data storage device.
11. The method of claim 10 further comprising the second node transmitting the modified meta data to the first mode via the first communication link before the first node writes the data to the allocated storage memory via the second communication link.
12. The method of claim 3 wherein the amount of storage memory allocated by the single node file system exceeds the quantity contained within the first message.
13. A computer readable memory comprising instructions executable by a first computer system to implement a method in response to the first computer system receiving data, the method comprising:
the first computer system determining whether storage memory of a data storage device has been allocated to store the data; and
the first computer system transmitting a first message to a second computer system via a first communication link in response to the first computer system determining that no storage memory of the data storage device has been allocated to store the data, wherein the first message represents a request for the second computer system to allocate data storage device storage memory for the data;
the first computer system writing the data to a storage memory block of the data storage device via a second communication link in response to the first computer system receiving a second message from the second computer system via the first communication link, wherein the first computer system receives the second message after the first computer system transmits the first message and wherein the first computer system writes the data to the storage memory block without the data first transmitting through the first communication link.