1. A method in a computer system for failover when at least one of a first network adapter and a data path through the first network adapter fails, wherein the computer system includes a filter driver, and wherein the first network adapter is connected to a second network adapter, comprising:
receiving, with the filter driver, a path fail notification that at least one of the first network adapter and the data path through the first network adapter has failed;
rerouting, with the filter driver, packets directed to the first network adapter to the second network adapter; and
changing, with the filter driver, a success status of each packet that had been directed to the first network adapter before the path fail notification was received to a busy status, wherein the change in status causes each packet to be reissued.
2. The method of claim 1, further comprising:
determining, with the filter driver, a new data path including the second network adapter.
3. The method of claim 1, further comprising:
receiving, with the filter driver, a notification that the first network adapter is restored; and
determining, with the filter driver, a data path for new data packets based on whether the notification specified a new data path.
4. The method of claim 1, further comprising:
designating, with the filter driver, a first storage device stack as a primary storage device stack in response to building the first storage device stack for a logical unit; and
designating, with the filter driver, a subsequent storage device stack as a secondary storage device stack in response to building the subsequent storage device stack for the logical unit.
5. The method of claim 4, further comprising:
preventing, with the filter driver, file system mounting on the secondary storage device stack.
6. A system coupled to a network and data storage, comprising:
a host computer;
a storage controller managing InputOutput (IO) access to the data storage, wherein the storage controller is coupled to the host computer;
a first network adapter
a second network adapter; and
a filter driver at the host computer, wherein the filter driver is capable of receiving a path fail notification that at least one of the first network adapter and a data path through the first network adapter has failed, rerouting packets directed to the first network adapter to the second network adapter; changing a success status of each packet that had been directed to the first network adapter before the path fail notification was received to a busy status, wherein the change in status causes each packet to be reissued.
7. The system of claim 6, wherein the filter driver is further capable of:
determining a new data path including the second network adapter.
8. The system of claim 6, wherein the filter driver is further capable of:
receiving a notification that the first network adapter is restored; and
determining a data path for new data packets based on whether the notification specified a new data path.
9. The system of claim 6, wherein the filter driver is further capable of:
designating a first storage device stack as a primary storage device stack in response to building the first storage device stack for a logical unit; and
designating a subsequent storage device stack as a secondary storage device stack in response to building the subsequent storage device stack for the logical unit.
10. The system of claim 9, wherein the filter driver is further capable of:
preventing file system mounting on the secondary storage device stack.
11. An article of manufacture comprising a storage medium having stored therein instructions that when executed by a computing device results in the following:
at a filter driver,
receiving a path fail notification that at least one of a first network adapter and a data path through the first network adapter has failed;
rerouting packets directed to the first network adapter to the second network adapter; and
changing, with the filter driver, a success status of each packet that had been directed to the first network adapter before the path fail notification was received to a busy status, wherein the change in status causes each packet to be reissued for processing again by the filter driver.
12. The article of manufacture of claim 11, the instructions when executed further result in the following:
determining a new data path including the second network adapter.
13. The article of manufacture of claim 11, the instructions when executed further result in the following:
receiving a notification that the first network adapter is restored; and
determining a data path for new data packets based on whether the notification specified a new data path.
14. The article of manufacture of claim 11, the instructions when executed further result in the following:
designating a first storage device stack as a primary storage device stack in response to building the first storage device stack for a logical unit; and
designating a subsequent storage device stack as a secondary storage device stack in response to building the subsequent storage device stack for the logical unit.
15. The article of manufacture of claim 14, the instructions when executed further result in the following:
preventing file system mounting on the secondary storage device stack.
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 stator in which a plurality of coils constituting a coil group of the same phase are respectively arranged so as to include offset positions at which phases of induction voltage are different, whereby coil groups of three phases are disposed in a ring shape,
wherein a pair of coils of the same phase of induction voltage are set in each of two divided groups in a plurality of coils constituting the coil group of the same phase, the respective coils in each divided group are continuously wound in the same winding direction with a crossover provided between the respective coils which are adjacent to each other, the two divided groups are connected to each other in parallel, and lead wires in coil groups of the three phases are star connected,
wherein the pair of coils in each of the two divided groups are not adjacent to each other.
2. The stator according to claim 1, wherein all of the respective coils in the coil group of the same phase are continuously wound in the same winding direction with a crossover provided between the respective coils, and a crossover between coils of the two divided groups is formed as a neutral point of the star wire connection.
3. The stator according to claim 2, wherein the coils constituting one of the two divided groups are arranged at a position in which at least one coil in the group of the different phase is interposed.
4. The status according to claim 2, wherein the number of the coils constituting the coil group of the same phase is an even number equal to or more than four.
5. A brushless motor including the stator according to claim 2.
6. A brushless motor including the stator according to claim 1.
7. The stator according to claim 1, wherein the number of the coils constituting the coil group of the same phase is an even number equal to or more than four.
8. A brushless motor including the stator according to claim 7.
9. The stator according to claim 1, wherein the coils constituting one of the two divided groups are arranged at a position in which at least one coil in the coil group of the different phase is interposed.
10. The status according to claim 9, wherein the number of the coils constituting the coil group of the same phase is an even number equal to or more than four.
11. A brushless motor including the stator according to claim 9.