Method and apparatus of redundant path validation before provisioning

• US 9,354,915 B2
• Filed: 07/27/2012
• Issued: 05/31/2016
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Chong, Randy, Kano, Yoshiki, Ritchie, Dan, Masood, Abid
• Primary Examiner(s): Lazaro, David
• Assistant Examiner(s): Ye, Zi
• Application Number:
  US13/560,139
• Publication Number:
  US 20140032727A1
• Time in Patent Office: 1,404 Days
• Field of Search: 709/223, 370/248, 370/431, 370/395.53, 370/238, 714/18
• US Class Current: 1/1
• CPC Class Codes: G06F 11/2007 using redundant communication media
• CPC Class Codes: G06F 2009/45579 I/O management, e.g. providing access to device drivers or storage
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0617 in relation to availability
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0632 by initialisation or re-initialisation of storage systems
• CPC Class Codes: G06F 3/0635 by changing the path, e.g. traffic rerouting, path reconfiguration
• CPC Class Codes: G06F 3/0665 at area level, e.g. provisioning of virtual or logical volumes
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 9/45558 Hypervisor-specific management and integration aspects
• CPC Class Codes: H04L 12/467 Arrangements for supporting untagged frames, e.g. port-based VLANs
• CPC Class Codes: H04L 41/0853 by actively collecting configuration information or by backing up configuration information
• CPC Class Codes: H04L 41/0873 Checking configuration conflicts between network elements
• CPC Class Codes: H04L 49/356 for storage area networks
• CPC Class Codes: H04L 49/552 by ensuring the integrity of packets received through redundant connections
• 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

Exemplary embodiments of the invention provide a technique to validate physical cabling and logical path before provisioning volume. In accordance with an aspect, a computer comprises a memory storing software and a processor executing the software. The software is operable to: identify first server port and second server port forming redundant ports of a server and first storage port and second storage port forming redundant ports of a storage system; and check whether a redundant relationship is formed by at least one of (i) a physical connection between the first server port and the first storage port and a physical connection between the second server port and the second storage port, or (ii) a logical connection between the first server port and the first storage port and a logical connection between the second server port and the second storage port.

Claims

1. A computer comprising a memory storing software and a processor executing the software, wherein the software is operable to:

receive an identification of storage ports of a storage system corresponding to a volume to be provisioned, wherein the identification of storage ports include a first storage port and a second storage port to be used to access the same volume to be provisioned;

after receiving the identification of the storage ports, gather preset server configuration information including server ports of a plurality of servers managed by the computer;

after receiving the identification of the storage ports, gather preset FC-SW configuration information including port connection information of a plurality of FC-SWs indicating connections between ports of the FC-SWs and the server ports or storage ports, wherein the gathered preset FC-SW configuration information further includes reserved status of each of the ports of the FC-SWs, and;

after receiving the identification of the storage ports, gather preset storage configuration information including the identified storage ports; and

validate the redundant relationship by checking whether a redundant relationship is formed by a first physical connection between a first server port of the plurality of servers and the first storage port of the identified storage ports of the storage system and a second physical connection between a second server port of the plurality of servers and the second storage port of the identified storage ports of the storage system, the first physical connection and the second physical connection are selected based on the gathered preset configuration information of servers, FC-SWs and identified storage ports, to validate the first and second physical connections, wherein the software is operable to validate the redundant relationship by checking the connections between un-reserved ports of the FC-SWs and the server ports or storage ports; and

provision the volume from the storage system after validating the redundant relationship.

2. The computer according to claim 1,

wherein the software is operable to validate the first physical connection between the first server port and the first storage port and to validate the second physical connection between the second server port and the second storage port in order to establish the redundant relationship of the first and second physical connections;

and

wherein if the software does not validate the redundant relationship of the first and second physical connections, the software is operable to repair one or both of the first and second physical connections using reserved ports provided in reserved information stored in the memory so as to establish the redundant relationship of first and second physical connections.

3. The computer according to claim 1,

wherein the first server port and the second server port are used by a same virtual machine of the server.

4. The computer according to claim 1, wherein the software is operable to:

gather additional preset FC-SW configuration information including zone information of the FC-SW;

match the gathered ports from the preset server configuration information with the zone information of the FC-SW; and

after the software has validated the first and second physical connections, check whether a redundant relationship is formed by a first logical connection between the first server port of the plurality of servers and the first storage port of the identified storage ports of the storage system and a second logical connection between the second server port of the plurality of servers and the second storage port of the identified storage ports of the storage system to validate the first and second logical connections.

5. The computer according to claim 4,

wherein if the software does not validate the redundant relationship of the first and second logical connections, the software is operable to create a new zone for NPIV (Node Port Interface Virtualization) with a virtual machine port WWN (World Wide Name) and a storage port WWN to repair one or both of the first and second logical connections, so as to establish the redundant relationship of the first and second logical connections for the virtual machine.

6. The computer according to claim 1,

wherein the gathered preset FC-SW configuration information includes correspondence of the ports of the FC-SWs, discovered server ports and storage ports and the reserved status of the ports of the FC-SWs;

and

wherein the software is operable to validate the first physical connection by matching the first server port and the first storage port with the discovered server ports and storage ports corresponding to un-reserved ports of the FC-SWs, and to validate the second physical connection by matching the second server port and the second storage port with the discovered server ports and storage ports corresponding to un-reserved ports of the FC-SWs.

7. A system comprising:

a storage system; and

a computer including a memory storing software and a processor executing the software, wherein the software is operable to;

receive an identification of storage ports of a storage system corresponding to a volume to be provisioned, wherein the identification of storage ports include a first storage port and a second storage port to be used to access the same volume to be provisioned;

after receiving the identification of the storage ports, gather preset server configuration information including server ports of a plurality of servers managed by the computer;

after receiving the identification of the storage ports, gather preset FC-SW configuration information including port connection information of a plurality of FC-SWs indicating connections between ports of the FC-SWs and the server ports or storage ports, wherein the gathered preset FC-SW configuration information further includes reserved status of each of the ports of the FC-SWs, and;

after receiving the identification of the storage ports, gather preset storage configuration information including the identified storage ports; and

validate the redundant relationship by checking whether a redundant relationship is formed by a first physical connection between a first server port of the plurality of servers and the first storage port of the identified storage ports of the storage system and a second physical connection between a second server port of the plurality of servers and the second storage port of the identified storage ports of the storage system, the first physical connection and the second physical connection are selected based on the gathered preset configuration information of servers, FC-SWs and identified storage ports, to validate the first and second physical connections, wherein the software is operable to validate the redundant relationship by checking the connections between un-reserved ports of the FC-SWs and the server ports or storage ports; and

provision the volume from the storage system after validating the redundant relationship.

8. The system of claim 7, further comprising the server having the first server port and the second server port.

9. The system according to claim 7, wherein the software is operable to:

gather additional preset FC-SW configuration information including zone information of the FC-SW;

match the gathered ports from the preset server configuration information with the zone information of the FC-SW; and

after the software has validated the first and second physical connections, check whether a redundant relationship is formed by a first logical connection between the first server port of the plurality of servers and the first storage port of the identified storage ports of the storage system and a second logical connection between the second server port of the plurality of servers and the second storage port of the identified storage ports of the storage system to validate the first and second logical connections.

10. The system according to claim 9,

wherein the server having the first server port and the second server port is a first server having a first NIC (Network Interface Card) and a second NIC;

wherein the system further comprises a second server having a third NIC and a fourth NIC;

wherein each server of the first and second servers includes virtual machines connected to virtual switches which are connected to NICs;

wherein the system further comprises access switches which are coupled between the first and second servers and aggregation switches, the aggregation switches being coupled with the storage system;

wherein checking whether the redundant relationship is formed by the first and second physical connections comprises validating connectivity between the virtual switches and the NICs for each of the first and second servers; and

wherein checking whether the redundant relationship is formed by the first and second logical connections comprises validating redundancy between the first and second servers and the access switches, which includes;

enumerating all paths between the first and second NICs of the first server and the third and fourth NICs of the second server and storing the enumerated paths in a path table;

choosing a shortest path from the enumerated paths in the path table, storing the chosen shortest path in a shortest path table, and removing the chosen shortest path from the path table;

removing all paths from the shortest path table which contain one or more aggregation switches;

if there are one or more paths remaining in the path table, then repeating the choosing and the removing until there are no more paths remaining in the path table; and

validating that the redundant relationship of logical connection is formed if the first and second logical connections are formed by at least two chosen shortest paths remaining after the removing.

11. The system according to claim 9,

wherein the software is operable, after validating the redundant relationship of the first and second physical connections and the redundant relationship of the first and second logical connections, to set VLAN (Virtual Local Area Network) IDs to the first and second switch ports.

12. A non-transitory computer-readable storage medium storing a plurality of instructions for controlling a data processor to validate redundant paths, the plurality of instructions comprising:

instructions that cause the data processor to receive an identification of storage ports of a storage system corresponding to a volume to be provisioned, wherein the identified storage ports include a first storage port and a second storage port to be used to access the same volume to be provisioned;

instructions that cause the data processor to, after receiving the identification of the storage ports, gather preset server configuration information including server ports of a plurality of servers;

instructions that cause the data processor to, after receiving the identification of the storage ports, gather preset FC-SW configuration information including port connection information of a plurality of FC-SWs indicating connections between ports of the FC-SWs and the storage ports and the server ports wherein the gathered preset FC-SW configuration information includes a reserved status of each of the ports of the FC-SWs;

instructions that cause the data processor to, after receiving the identification of the storage ports, gather preset storage configuration information including the identified storage ports of the storage system; and

instructions that cause the data processor to validate a redundant relationship by checking whether a redundant relationship is formed by a first physical connection between a first server port of the plurality of servers and the first storage port of the identified storage ports of the storage system and a second physical connection between a second server port of the plurality of servers and the second storage port of the identified storage ports of the storage system, the first physical connection and the second physical connection are selected based on the gathered preset configuration information of servers, FC-SWs and identified storage ports, to validate the first and second physical connections, wherein the software is operable to validate the redundant relationship by checking the connections between un-reserved ports of the FC-SWs and the server ports or storage ports; and

instructions that cause the data processor to provision volume from the storage system after validating the redundant relationship.

13. The non-transitory computer-readable storage medium according to claim 12, wherein the plurality of instructions comprise:

instructions that cause the data processor, if the software does not validate the redundant relationship of the first and second physical connections, to repair one or both of the first and second physical connections using reserved ports provided in reserved information stored in the memory so as to establish the redundant relationship of the first and second physical connections.

14. The non-transitory computer-readable storage medium according to claim 12,

wherein the server having the first server port and the second server port is a first server having a first NIC (Network Interface Card) and a second NIC;

wherein a second server has a third NIC and a fourth NIC;

wherein each server of the first and second servers includes virtual machines connected to virtual switches which are connected to NICs;

wherein access switches are coupled between the first and second servers and aggregation switches, the aggregation switches being coupled with the storage system;

wherein the instructions that cause the data processor to check whether a redundant relationship of physical connection is formed by a physical connection between the first server port and the first storage port and a physical connection between the second server port and the second storage port comprise instructions that cause the data processor to validate connectivity between the virtual switches and the NICs for each of the first and second servers; and

wherein the instructions that cause the data processor to check whether a redundant relationship of logical connection is formed by a logical connection between the first server port and the first storage port and a logical connection between the second server port and the second storage port comprise instructions that cause the data processor to validate redundancy between the first and second servers and access switches, which include;

instructions that cause the data processor to enumerate all paths between the first and second NICs of the first server and the third and fourth NICs of the second server and storing the enumerated paths in a path table;

instructions that cause the data processor to choose a shortest path from the enumerated paths in the path table, store the chosen shortest path in a shortest path table, and remove the chosen shortest path from the path table;

instructions that cause the data processor to remove all paths from the shortest path table which contain one or more aggregation switches;

instructions that cause the data processor, if there are one or more paths remaining in the path table, to repeat the choosing and the removing until there are no more paths remaining in the path table; and

instructions that cause the data processor to validate that a redundant relationship of logical connection is formed if there are at least two chosen shortest paths remaining after the removing.

15. The non-transitory computer-readable storage medium according to claim 12, wherein the plurality of instructions comprise:

instructions that cause the data processor to gather additional preset FC-SW configuration information including zone information of the FC-SW;

instructions that cause the data processor to match the gathered ports from the preset server configuration information with the zone information of the FC-SW; and

instructions that cause the data processor to, after the software has validated the first and second physical connections, check whether a redundant relationship is formed by a first logical connection between the first server port of the plurality of servers and the first storage port of the identified storage ports of the storage system and a second logical connection between the second server port of the plurality of servers and the second storage port of the identified storage ports of the storage system to validate the first and second logical connections.

16. The non-transitory computer-readable storage medium according to claim 15, wherein the plurality of instructions comprise:

instructions that cause the data processor, if the software does not validate the redundant relationship of the first and second logical connections, to create a new zone with a server port WWN (World Wide Name) and a storage port WWN to repair one or both of the first and second logical connections, so as to establish the redundant relationship of the first and second logical connections.

17. The non-transitory computer-readable storage medium according to claim 15,

wherein the first server port and the second server port are used by a same virtual machine of the server;

and

wherein the plurality of instructions comprise;

instructions that cause the data processor, if the software does not validate the redundant relationship of the first and second logical connections, to create a new zone for NPIV (Node Port Interface Virtualization) with a virtual machine port WWN (World Wide Name) and a storage port WWN to repair one or both of the first and second logical connections, so as to establish the redundant relationship of first and second logical connections for the virtual machine.