发明名称 |
System for alotting logical path number to logical interfaces and permitting logical interface to access selected I/O using logical path number when selected I/O is not in use |
摘要 |
Disclosed is an exclusive control method in an I/O subsystem having an exclusive controller which is provided with an exclusive control table and which permits a host interface to use the I/O device when the I/O device is not used by any other host interface while prohibiting the use when another host interface is using the I/O device. The method comprises the steps of: allotting a logical path number to each of the host interfaces of each of the input/output interface portions; judging whether or not the I/O device is being used by another host interface by reference to the exclusive control table when a request for use of the I/O device is input from a host interface to which a predetermined logical path number is allotted; permitting the host interface which has required for access to use the I/O device when the I/O device is not in use, while setting a flag indicating that the I/O device is "Occupied" in the exclusive control table in correspondence with the allotted logical path number; and changing the flag to a flag indicating that the I/O device is "Vacant" when the use of the I/O device is finished.
|
申请公布号 |
US5925111(A) |
申请公布日期 |
1999.07.20 |
申请号 |
US19970853315 |
申请日期 |
1997.05.08 |
申请人 |
FUJITSU, LIMITED |
发明人 |
NAGASAWA, SOICHIRO |
分类号 |
G06F13/14;G06F13/20;(IPC1-7):G06F13/00 |
主分类号 |
G06F13/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|