Computing system and method of changing I/O configuration thereof
A computing system includes: first and second I/O interfaces that are associated with a server; and an I/O management unit that connects the server with the first and second I/O interfaces. The I/O management unit includes: an I/O buffer; an I/O mapping unit that stores an access request of the server to the first I/O interface in the I/O buffer in response to a change start request of the first I/O interface associated with the server to the second I/O interface; an I/O changing unit that associates the second I/O interface with the server; and an I/O synchronizing unit that converts the access request stored in the I/O buffer into an access request to the second I/O interface, in response to the completion of the association by the I/O changing unit, and executes the converted access request.
1. A computing system comprising:
a first I/O interface associating with a server; and
an I/O management unit coupled with the server and the first I/O interface, the I/O management unit including:
an I/O buffer;
an I/O mapping unit storing an access request of the server to the first I/O interface in the I/O buffer in response to a change start request of the first I/O interface associated with the server to a second I/O interface;
an I/O changing unit associating the second I/O interface with the server; and
an I/O synchronizing unit that converting the access request stored in the I/O buffer into an access request to the second I/O interface, in response to the completion of the association by the I/O changing unit, and executing the converted access request.
2. The computing system according to claim 1 ,
wherein, if the I/O changing unit cannot associate the second I/O interface with the server, the I/O synchronizing unit executes the access request stored in the I/O buffer to the first I/O interface.
3. The computing system according to claim 2 ,
wherein the first and second I/O interfaces couple the server with the same type of target apparatuses.
4. The computing system according to claim 3 , further comprising:
a virtualization unit managing the server,
wherein the server is a virtual server.
5. The computing system according to claim 4 ,
wherein the I/O management unit is included in the virtualization unit.
6. The computing system according to claim 3 ,
wherein, if the first and second I/O interfaces are network interfaces, the I/O changing unit changes an ID of the first I/O interface to an ID of the second I/O interface.
7. The computing system according to claim 6 ,
wherein the ID is a WWN or a MAC address.
8. The computing system according to claim 2 , further comprising:
a management server issuing the change start request using information identifying the server and the first and second I/O interfaces as parameters.
9. The computing system according to claim 8 ,
wherein the management server issues the change start request on the basis of any one of an instruction from a user, the detection of a high load of the first I/O interface, and the detection of trouble of the first I/O interface or a sign of the trouble.
10. An I/O management device coupled with a server, comprising:
an I/O buffer;
an I/O mapping unit storing an access request of the server to a first I/O interface in the I/O buffer in response to a change start request of the first I/O interface associated with the server to a second I/O interface;
an I/O changing unit associating the second I/O interface with the server; and
an I/O synchronizing unit converting the access request stored in the I/O buffer into an access request to the second I/O interface, in response to the completion of the association by the I/O changing unit, and executing the converted access request.
11. The I/O management device according to claim 10 ,
wherein, if the I/O changing unit cannot associate the second I/O interface with the server, the I/O synchronizing unit executes the access request stored in the I/O buffer to the first I/O interface.
12. The I/O management device according to claim 11 ,
wherein the first and second I/O interfaces couple the server with the same type of target apparatuses.
13. The I/O management device according to claim 12 ,
wherein, if the first and second I/O interfaces are network interfaces, the I/O changing unit changes an ID of the first I/O interface to an ID of the second I/O interface.
14. The I/O management device according to claim 13 ,
wherein the ID is a WWN or a MAC address.
15. The I/O management device according to claim 11 ,
wherein the I/O management device receives from an external management server the change start request, using information identifying the server and the first and second I/O interfaces as parameters.
16. A method of changing the I/O configuration of a computing system using an I/O management unit that has an I/O buffer and changes a first I/O interface associated with a server to a second I/O interface, the method comprising:
storing an access request of the server to the first I/O interface in the I/O buffer in response to a change start request of the first I/O interface associated with the server to the second I/O interface;
associating the second I/O interface with the server;
converting the access request stored in the I/O buffer into an access request to the second I/O interface, in response to the completion of the association; and
executing the converted access request.
17. The method of changing the I/O configuration of a computing system according to claim 16 ,
wherein, if the association between the server and the second I/O interface is unavailable, the access request to the first I/O interface, which is stored in the I/O buffer, is executed.
18. The method of changing the I/O configuration of a computing system according to claim 17 ,
wherein the server is a virtual server, and
the I/O management unit manages the execution of the access request from the virtual server to the first and second I/O interfaces.