Command multiplex number monitoring control scheme and computer system using the command multiplex number monitoring control scheme

• US 20050223138A1
• Filed: 06/15/2004
• Published: 10/06/2005
• Est. Priority Date: 04/05/2004
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Nagata, Koji, Shiraki, Shinjiro
• Granted Patent: US 7,069,353 B2
• Time in Patent Office: Days
• US Class Current: 710/36
• CPC Class Codes: G06F 21/805 using a security table for the storage sub-system
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0637 Permissions
• CPC Class Codes: G06F 3/0653 Monitoring storage devices or systems
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: H04L 49/90 Buffering arrangements
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

There is provided a command multiplex number monitoring control scheme capable of avoiding issue of a QF status and getting rid of system performance degradation without adding command processing resources. Command issue multiplex numbers CMs (32, 16 and 8) for WWN1-LU2, WWN2-LU1 and WWN3-LU0 are set in a port PT1 so as to be associated with the host bus adaptors HBAs in higher rank apparatuses HOST-1, HOST-2 and HOST-3. Denoting the sum total of command issue multiplex numbers CMs for respective set access permissions by (C), an access permission satisfying the relationship represented as “command processing multiplex limit number (B)≧the sum total (C) of command issue multiplex numbers CMs for respective access permissions” is not permitted. Thus, the command issue multiplex numbers of the connected higher rank apparatuses are monitored.

Claims

1. A command multiplex number monitoring control scheme in a computer system, the computer system including a storage apparatus and one or more higher rank apparatuses, the storage apparatus including a volume and a storage control apparatus, the volume including one or more logical units, the storage control apparatus including one or more ports, each of the higher rank apparatuses having a world wide name, the higher rank apparatuses being connected to the storage apparatus via a network, wherein

command issue multiplex numbers which are set in the higher rank apparatuses for each access permission information constituted of world wide names of the higher rank apparatuses and the logical units corresponding to the world wide names in the storage apparatus are also set in the ports in the storage apparatus, and

setting of access permission information for which a total of the set command issue multiplex numbers exceeds a command processing multiplex limit number of the storage control apparatus is rejected as abnormal.

2. The command multiplex number monitoring control scheme according to claim 1, wherein

a reference instruction whereby the command issue multiplex numbers set in the storage control apparatus can be referenced from the higher rank apparatuses is provided in the higher rank apparatuses, and

command issue multiplex numbers of the higher rank apparatuses managed in the storage control apparatus are correctly set in the higher rank apparatuses.

3. The command multiplex number monitoring control scheme according to claim 2, wherein by referencing the command issue multiplex numbers set in the higher rank apparatuses from a path management program incorporated in each of the higher rank apparatuses, and referencing values of the command issue multiplex numbers from the storage control apparatus, command issue multiplex numbers set in the higher rank apparatuses are correctly set in the storage control apparatus.

4. The command multiplex number monitoring control scheme according to claim 3, wherein

a command processing multiplex number that determines priority of command processing is set in the storage control apparatus for each world wide name provided for a higher rank apparatus and a corresponding logical unit in the storage apparatus, and

a command full status is reported against a command received in excess of a value set for each world wide name and corresponding logical unit of the storage apparatus, and thereby priority is assigned to each logical unit corresponding to the world wide name without judging abnormal for the setting of access permission information for which a total of the set command issue multiplex numbers exceeds a command processing multiplex limit number of the storage control apparatus.

5. The command multiplex number monitoring control scheme according to claim 4, wherein

a command multiplex situation received for each world wide name provided for each higher rank apparatus and the corresponding logical unit in the storage apparatus is monitored, and

if a command exceeding the assigned priority is received and command processing is not present in a world wide name provided for another higher rank apparatus and the corresponding logical unit in the storage apparatus, processing resources are assigned to the world wide name provided for the higher rank apparatus under operation and the corresponding logical units in the storage apparatus under operation.

6. A computer system including one or more higher rank apparatuses, a storage apparatus, and a network for connecting the higher rank apparatuses to the storage apparatus, the storage apparatus including a volume and a storage control apparatus, the volume including one or more logical units, the storage control apparatus including one or more ports,

each of the higher rank apparatuses has a world wide name serving as an identifier, and a command issue multiplex number is set in each of the higher rank apparatuses, and

the storage control apparatus includes an access permission information management table for managing permission information of access from the higher rank apparatuses to the logical units, and an information setting apparatus for setting access permission information in the access permission information management table.

7. The computer system according to claim 6, wherein

the command issue multiplex numbers set for each world wide names in the higher rank apparatus and corresponding logical unit in the storage apparatus are set in the ports, and

setting access permission information for which a total of the set command issue multiplex numbers exceeds a command processing multiplex limit number is rejected as abnormal.

8. The computer system according to claim 6, wherein the storage apparatus comprises a personal computer for setting the access information in the access permission information management table via the information setting apparatus.