Granted Patent B1

US 12,613,656 · App. 18/931,242 · Granted Apr 28, 2026

Inventors: Ramesh Kumar Marupaka (Hyderabad, IN); Sanket Rathi (Hyderabad, IN); Nidhyanandhan Arumugam (Hyderabad, IN); Phani Kumar V. U. Ayyagari (Hyderabad, IN); Chaitanya Paturu (Hyderabad, IN)

Assignee: International Business Machines Corporation

G06F3/0656G06F3/061G06F3/0635G06F3/067

Abstract

Claims (58)

1 . A method for dynamic path selection based on Scheduler's Resource Allocation Domain (SRAD), the method comprising:

receiving, by a driver, an allocation of an input/output (I/O) buffer for an I/O request targeting a storage device;

selecting a path to the storage device for carrying out the I/O request based on a buffer SRAD associated with the I/O buffer; and

sending the I/O request via the selected path.

2 . The method of claim 1 , wherein selecting the path includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the V/O buffer; and

selecting, based on a determination that a potential path exists to an adapter having an adapter SRAD that matches the buffer SRAD, the potential path for carrying out the I/O request.

3 . The method of claim 1 , wherein selecting the path includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the I/O buffer; and

selecting, based on a determination that a potential path does not exist to an adapter having an adapter SRAD that matches the buffer SRAD, a second path to a second adapter having an adapter SRAD closest to the buffer SRAD.

4 . The method of claim 1 , further comprising:

determining, prior to sending the I/O request via the selected path, whether the selected path is overloaded; and

selecting, based on the selected path being overloaded, an alternative path for carrying out the I/O request.

5 . The method of claim 4 , wherein determining whether the selected path is overloaded includes comparing an I/O rate associated with the selected path with an I/O path threshold.

6 . The method of claim 4 , wherein selecting the alternative path for carrying out the I/O request includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the I/O buffer; and

selecting a second path to an adapter having an adapter SRAD closest to the buffer SRAD, wherein the second path is not overloaded.

7 . The method of claim 1 , wherein the buffer SRAD associated with the I/O buffer is identified using kernel services.

8 . A computer system for dynamic path selection based on Scheduler's Resource Allocation Domain (SRAD), the computer system comprising:

a processor set;

one or more computer-readable storage media; and

program instructions stored on the one or more computer-readable storage media configured to cause the processor set to perform operations comprising:

receiving, by a driver, an allocation of an input/output (I/O) buffer for an I/O request targeting a storage device;

selecting a path to the storage device for carrying out the I/O request based on a buffer SRAD associated with the I/O buffer; and

sending the I/O request via the selected path.

9 . The computer system of claim 8 , wherein selecting the path includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the I/O buffer; and

selecting, based on a determination that a potential path exists to an adapter having an adapter SRAD that matches the buffer SRAD, the potential path for carrying out the I/O request.

10 . The computer system of claim 8 , wherein selecting the path includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the I/O buffer; and

selecting, based on a determination that a potential path does not exist to an adapter having an adapter SRAD that matches the buffer SRAD, a second path to a second adapter having an adapter SRAD closest to the buffer SRAD.

11 . The computer system of claim 8 , wherein the operations further comprise:

determining, prior to sending the I/O request via the selected path, whether the selected path is overloaded; and

selecting, based on the selected path being overloaded, an alternative path for carrying out the I/O request.

12 . The computer system of claim 11 , wherein determining whether the selected path is overloaded includes comparing an I/O rate associated with the selected path with an I/O path threshold.

13 . The computer system of claim 11 , wherein selecting the alternative path for carrying out the I/O request includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the I/O buffer; and

selecting a second path to an adapter having an adapter SRAD closest to the buffer SRAD, wherein the second path is not overloaded.

14 . The computer system of claim 8 , wherein the buffer SRAD associated with the I/O buffer is identified using kernel services.

15 . A computer program product for dynamic path selection based on Scheduler's Resource Allocation Domain (SRAD), the computer program product comprising:

one or more computer-readable storage media; and

program instructions stored on the one or more computer-readable storage media configured to perform operations comprising:

receiving, by a driver, an allocation of an input/output (I/O) buffer for an I/O request targeting a storage device;

selecting a path to the storage device for carrying out the I/O request based on a buffer SRAD associated with the I/O buffer; and

sending the I/O request via the selected path.

16 . The computer program product of claim 15 , wherein selecting the path includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the I/O buffer; and

selecting, based on a determination that a potential path exists to an adapter having an adapter SRAD that matches the buffer SRAD, the potential path for carrying out the I/O request.

17 . The computer program product of claim 15 , wherein selecting the path includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the I/O buffer; and

selecting, based on a determination that a potential path does not exist to an adapter having an adapter SRAD that matches the buffer SRAD, a second path to a second adapter having an adapter SRAD closest to the buffer SRAD.

18 . The computer program product of claim 15 , wherein the operations further comprise:

determining, prior to sending the I/O request via the selected path, whether the selected path is overloaded; and

selecting, based on the selected path being overloaded, an alternative path for carrying out the I/O request.

19 . The computer program product of claim 18 , wherein determining whether the selected path is overloaded includes comparing an I/O rate associated with the selected path with an I/O path threshold.

20 . The computer program product of claim 18 , wherein selecting the alternative path for carrying out the I/O request includes:

identifying the buffer SRAD associated with the I/O buffer responsive to receiving the I/O buffer; and

selecting a second path to an adapter having an adapter SRAD closest to the buffer SRAD, wherein the second path is not overloaded.

Assignments (1)

References Cited (12)