Path-based data migration from source device to target device
A host device comprises a current multi-path input-output (MPIO) driver that is configured to group paths from the host device to a source logical volume into a source multi-path logical device. A source multi-path logical device for a target MPIO driver is generated that has the same group of paths as the source multi-path logical device of the current MPIO driver. The source multi-path logical device of the target MPIO driver is added as a path in the source multi-path logical device of the current MPIO driver and the other paths are removed. A target multi-path logical device for the target MPIO driver is generated that groups paths from the host device to a target logical volume into the target multi-path logical device. Data from the source logical volume to the target logical volume is migrated based at least in part on the source and target multi-path logical devices of the target MPIO driver.
1. An apparatus comprising:
a host device configured to communicate over a network with a storage system;
the host device comprising a current multi-path input-output driver configured to control delivery of input-output operations to the storage system over the network, the current multi-path input-output driver grouping a plurality of paths from the host device to a source logical volume of the storage system into a source multi-path logical device of the current multi-path input-output driver;
wherein the host device is further configured:
to generate a source multi-path logical device for a target multi-path input-output driver, the source multi-path logical device of the target multi-path input-output driver comprising a same grouping of the plurality of paths from the host device to the source logical volume as the source multi-path logical device of the current multi-path input-output driver;
to add the source multi-path logical device of the target multi-path input-output driver as a path in the source multi-path logical device of the current multi-path input-output driver;
to remove one or more paths of the source multi-path logical device of the current multi-path input-output driver other than the added path;
to generate a target multi-path logical device for the target multi-path input-output driver, the target multi-path input-output driver grouping a plurality of paths from the host device to a target logical volume of the storage system into the target multi-path logical device of the target multi-path input-output driver; and
to migrate data from the source logical volume to the target logical volume based at least in part on the source multi-path logical device of the target multi-path input-output driver and the target multi-path logical device of the target multi-path input-output driver.
2. The apparatus of claim 1 wherein the host device is further configured:
to replace the paths of the source multi-path logical device of the target multi-path input-output driver with the paths of the target multi-path logical device of the target multi-path input-output driver.
3. The apparatus of claim 1 wherein the host device is further configured:
to replace the paths of the target multi-path logical device of the target multi-path input-output driver with the paths of the source multi-path logical device of the target multi-path input-output driver.
4. The apparatus of claim 1 wherein adding the source multi-path logical device of the target multi-path input-output driver as a path in the source multi-path logical device of the current multi-path input-output driver comprises:
suspending the source multi-path logical device of the current multi-path input-output driver;
modifying a path mapping of the source multi-path logical device of the current multi-path input-output driver to include the source multi-path logical device of the target multi-path input-output driver as a path;
resuming the source multi-path logical device of the current multi-path input-output driver; and
reloading the path mapping of the source multi-path logical device of the current multi-path input-output driver based at least in part on the modified path mapping.
5. The apparatus of claim 1 wherein removing one or more paths of the source multi-path logical device of the current multi-path input-output driver other than the added path comprises:
suspending the source multi-path logical device of the current multi-path input-output driver;
modifying a path mapping of the source multi-path logical device of the current multi-path input-output driver to remove one or more paths other than the added path;
resuming the source multi-path logical device of the current multi-path input-output driver; and
reloading the path mapping of the source multi-path logical device of the current multi-path input-output driver based at least in part on the modified path mapping.
6. The apparatus of claim 1 wherein in conjunction with a reboot after the migration of the data, the host device is further configured:
to generate a plurality of multi-path logical devices for the target multi-path input-output driver;
to determine whether or not a given one of the generated multi-path logical devices corresponds to the source multi-path logical device of the target multi-path input-output driver; and
in response to determining that the given one of the generated multi-path logical devices correspond to the source multi-path logical device of the target multi-path input-output driver, to generate a link from the source multi-path logical device of the current multi-path input-output driver to the given one of the generated multi-path logical devices such that input-output operations directed toward the source multi-path logical device of the current multi-path input-output driver are redirected to the given one of the generated multi-path logical devices.
7. The apparatus of claim 1 wherein the current multi-path input-output driver groups the plurality of paths from the host device to the target logical volume of the storage system into a target multi-path logical device of the current multi-path input-output driver and wherein the host device is further configured:
to add the target multi-path logical device of the target multi-path input-output driver as a path in the target multi-path logical device of the current multi-path input-output driver; and
to remove one or more paths of the target multi-path logical device of the current multi-path input-output driver other than the path added to the target multi-path logical device of the current multi-path input-output driver.
8. A method comprising:
generating a source multi-path logical device for a target multi-path input-output driver of a host device, the host device comprising a current multi-path input-output driver that is configured to control delivery of input-output operations to a storage system over a network, the current multi-path input-output driver grouping a plurality of paths from the host device to a source logical volume of the storage system into a source multi-path logical device of the current multi-path input-output driver, the source multi-path logical device of the target multi-path input-output driver comprising a same grouping of the plurality of paths from the host device to the source logical volume as the source multi-path logical device of the current multi-path input-output driver;
adding the source multi-path logical device of the target multi-path input-output driver as a path in the source multi-path logical device of the current multi-path input-output driver;
removing one or more paths of the source multi-path logical device of the current multi-path input-output driver other than the added path;
generating a target multi-path logical device for the target multi-path input-output driver, the target multi-path input-output driver grouping a plurality of paths from the host device to a target logical volume of the storage system into the target multi-path logical device of the target multi-path input-output driver; and
migrating data from the source logical volume to the target logical volume based at least in part on the source multi-path logical device of the target multi-path input-output driver and the target multi-path logical device of the target multi-path input-output driver.
9. The method of claim 8 wherein the method further comprises replacing the paths of the source multi-path logical device of the target multi-path input-output driver with the paths of the target multi-path logical device of the target multi-path input-output driver.
10. The method of claim 8 wherein the method further comprises replacing the paths of the target multi-path logical device of the target multi-path input-output driver with the paths of the source multi-path logical device of the target multi-path input-output driver.
11. The method of claim 8 wherein adding the source multi-path logical device of the target multi-path input-output driver as a path in the source multi-path logical device of the current multi-path input-output driver comprises:
suspending the source multi-path logical device of the current multi-path input-output driver;
modifying a path mapping of the source multi-path logical device of the current multi-path input-output driver to include the source multi-path logical device of the target multi-path input-output driver as a path;
resuming the source multi-path logical device of the current multi-path input-output driver; and
reloading the path mapping of the source multi-path logical device of the current multi-path input-output driver based at least in part on the modified path mapping.
12. The method of claim 8 wherein removing one or more paths of the source multi-path logical device of the current multi-path input-output driver other than the added path comprises:
suspending the source multi-path logical device of the current multi-path input-output driver;
modifying a path mapping of the source multi-path logical device of the current multi-path input-output driver to remove one or more paths other than the added path;
resuming the source multi-path logical device of the current multi-path input-output driver; and
reloading the path mapping of the source multi-path logical device of the current multi-path input-output driver based at least in part on the modified path mapping.
13. The method of claim 8 wherein in conjunction with a reboot after the migration of the data, the method further comprises:
generating a plurality of multi-path logical devices for the target multi-path input-output driver;
determining whether or not a given one of the generated multi-path logical devices corresponds to the source multi-path logical device of the target multi-path input-output driver; and
in response to determining that the given one of the generated multi-path logical devices correspond to the source multi-path logical device of the target multi-path input-output driver, generating a link from the source multi-path logical device of the current multi-path input-output driver to the given one of the generated multi-path logical devices such that input-output operations directed toward the source multi-path logical device of the current multi-path input-output driver are redirected to the given one of the generated multi-path logical devices.
14. The method of claim 8 wherein the current multi-path input-output driver groups the plurality of paths from the host device to the target logical volume of the storage system into a target multi-path logical device of the current multi-path input-output driver and wherein the method further comprises:
adding the target multi-path logical device of the target multi-path input-output driver as a path in the target multi-path logical device of the current multi-path input-output driver; and
removing one or more paths of the target multi-path logical device of the current multi-path input-output driver other than the path added to the target multi-path logical device of the current multi-path input-output driver.
15. A computer program product comprising a non-transitory processor-readable storage medium having stored therein program code of one or more software programs, wherein the program code, when executed by a host device comprising a current multi-path input-output driver, the host device being configured to communicate over a network with a storage system, the current multi-path input-output driver configured to control delivery of input-output operations to the storage system over the network, the current multi-path input-output driver grouping a plurality of paths from the host device to a source logical volume of the storage system into a source multi-path logical device of the current multi-path input-output driver, causes the host device:
to generate a source multi-path logical device for a target multi-path input-output driver, the source multi-path logical device of the target multi-path input-output driver comprising a same grouping of the plurality of paths from the host device to the source logical volume as the source multi-path logical device of the current multi-path input-output driver;
to add the source multi-path logical device of the target multi-path input-output driver as a path in the source multi-path logical device of the current multi-path input-output driver;
to remove one or more paths of the source multi-path logical device of the current multi-path input-output driver other than the added path;
to generate a target multi-path logical device for the target multi-path input-output driver, the target multi-path input-output driver grouping a plurality of paths from the host device to a target logical volume of the storage system into the target multi-path logical device of the target multi-path input-output driver; and
to migrate data from the source logical volume to the target logical volume based at least in part on the source multi-path logical device of the target multi-path input-output driver and the target multi-path logical device of the target multi-path input-output driver.
16. The computer program product of claim 15 wherein the program code further causes the host device to replace the paths of the source multi-path logical device of the target multi-path input-output driver with the paths of the target multi-path logical device of the target multi-path input-output driver.
17. The computer program product of claim 15 wherein the program code further causes the host device to replace the paths of the target multi-path logical device of the target multi-path input-output driver with the paths of the source multi-path logical device of the target multi-path input-output driver.
18. The computer program product of claim 15 wherein adding the source multi-path logical device of the target multi-path input-output driver as a path in the source multi-path logical device of the current multi-path input-output driver comprises:
suspending the source multi-path logical device of the current multi-path input-output driver;
modifying a path mapping of the source multi-path logical device of the current multi-path input-output driver to include the source multi-path logical device of the target multi-path input-output driver as a path;
resuming the source multi-path logical device of the current multi-path input-output driver; and
reloading the path mapping of the source multi-path logical device of the current multi-path input-output driver based at least in part on the modified path mapping.
19. The computer program product of claim 15 wherein removing one or more paths of the source multi-path logical device of the current multi-path input-output driver other than the added path comprises:
suspending the source multi-path logical device of the current multi-path input-output driver;
modifying a path mapping of the source multi-path logical device of the current multi-path input-output driver to remove one or more paths other than the added path;
resuming the source multi-path logical device of the current multi-path input-output driver; and
reloading the path mapping of the source multi-path logical device of the current multi-path input-output driver based at least in part on the modified path mapping.
20. The computer program product of claim 15 wherein the current multi-path input-output driver groups the plurality of paths from the host device to the target logical volume of the storage system into a target multi-path logical device of the current multi-path input-output driver and wherein the program code further causes the host device:
to add the target multi-path logical device of the target multi-path input-output driver as a path in the target multi-path logical device of the current multi-path input-output driver; and
to remove one or more paths of the target multi-path logical device of the current multi-path input-output driver other than the path added to the target multi-path logical device of the current multi-path input-output driver.