Executing a host initiated link reset in a storage area network
Embodiments include performing a host-initiated link reset in a storage area network (SAN). Aspects include identifying, by a host in communication with the SAN, each link in the SAN, wherein each link is defined by a pair of ports. Aspects also include obtaining, by the host, a buffer credit balance for each port in the SAN and obtaining, by the host, a buffer credit for each port in the SAN and causing a reset of a link associated with the port by transmitting a link reset record from the host to a control device of the link based on a determination that the buffer credit of a port in the SAN is below a threshold value.
1. A computer-implemented method for performing a host-initiated link reset in a storage area network (SAN), the method comprising;
identifying, by a host in communication with the SAN, each link in the SAN, wherein each link is defined by a pair of ports;
obtaining, by the host, a buffer credit for each port in the SAN; and
based on a determination that the buffer credit of a port in the SAN is below a threshold value, causing a reset of a link associated with the port by transmitting a link reset record from the host to a control device of the link,
wherein the link reset record includes a source port address and a destination port address that identify the link.
2. The computer-implemented method of claim 1 , wherein obtaining the buffer credit for each port in the SAN is performed on a periodic basis.
3. The computer-implemented method of claim 2 , wherein a frequency of the periodic basis is configurable by a user of the host.
4. The computer-implemented method of claim 1 , wherein the threshold value is a predetermined number that is provided by a user.
5. The computer-implemented method of claim 1 , wherein the threshold value is a predetermined number has a default value of zero.
6. A storage area network (SAN) comprising:
one or more network devices;
a plurality of end devices each coupled to at least one of the one or more network devices, wherein one of the plurality of end devices is a host device that is configured to:
identify each link in the SAN, wherein each link is defined by a pair of ports;
obtain a buffer credit balance for each port in the SAN; and
based on a determination that the buffer credit of a port in the SAN is below a threshold value, cause a reset of a link associated with the port by transmitting a link reset record from the host to a control device of the link, wherein the link reset record includes a source port address and a destination port address that identify the link.
7. The SAN of claim 6 , wherein obtaining the buffer credit for each port in the SAN is performed on a periodic basis.
8. The SAN of claim 7 , wherein a frequency of the periodic basis is configurable by a user of the host.
9. The SAN of claim 6 , wherein the threshold value is a predetermined number that is provided by a user.
10. The SAN of claim 6 , wherein the threshold value is a predetermined number has a default value of zero.
11. A computer program product for performing a host-initiated link reset in a storage area network (SAN), the computer program product comprising:
a non-transitory computer-readable storage medium having program instructions embodied therewith, the program instructions readable by a processor to cause the processor to:
identify, by a host in communication with the SAN, each link in the SAN, wherein each link is defined by a pair of ports;
obtain, by the host, a buffer credit balance for each port in the SAN;
obtain a buffer credit balance for each port in the SAN; and
based on a determination that the buffer credit of a port in the SAN is below a threshold value, cause a reset of a link associated with the port by transmitting a link reset record from the host to a control device of the link, wherein the link reset record includes a source port address and a destination port address that identify the link.
12. The computer program product of claim 11 , wherein obtaining the buffer credit for each port in the SAN is performed on a periodic basis.
13. The computer program product of claim 11 , wherein the threshold value is a predetermined number that is provided by a user.
14. The computer program product of claim 11 , wherein the threshold value is a predetermined number has a default value of zero.