Enhanced soft fence of devices

Patent metadata

Field	Value
Publication number	US-11079966-B2
Application number	US-201916558408-A
Country	US
Kind code	B2
Filing date	Sep 3, 2019
Priority date	Feb 15, 2018
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A method, computer system, and a computer program product for soft fencing is provided. The present invention may include identifying a logical device swap occurred. The present invention may also include, in response to a logical device swap, creating a soft fence command. The present invention may then include issuing the created soft fence command.

First claim

What is claimed is:

1. A method for soft fencing, the method comprising:
processing an input-output services (IOS) record in a storage system control data set (CDS);
creating a list of path group identifiers (PGIDs);
identifying the created list of PGIDs associated with a production sysplex;
associating the identified list of PGIDs with the production sysplex;
identifying a plurality of sysplex names not associated with the production sysplex;
identifying a logical device swap occurred; and
in response to the logical device swap, creating a soft fence command.

2. The method of claim 1 , further comprises:
issuing the soft fence command.

3. The method of claim 1 , wherein the soft fence command includes a logical subsystem (LSS) command, a device bitmap and an action field.

4. The method of claim 1 , further comprising:
identifying a plurality of logical device swaps occurred;
in response to the plurality of logical device swaps, creating a soft fence command for each logical device swap; and
issuing the new created soft fence commands.

5. The method of claim 1 , wherein the soft fence command is a read fence, a write fence or a read and write fence.

6. The method of claim 2 , wherein the list of PGIDs specifies which system is a read fenced system, a write fenced system or a read fenced and write fenced system.

7. The method of claim 3 , wherein the action field includes a type of the soft fence command issued.

8. A computer system for soft fencing, comprising:
one or more processors, one or more computer-readable memories, one or more computer-readable tangible storage media, and program instructions stored on at least one of the one or more computer-readable tangible storage media for execution by at least one of the one or more processors via at least one of the one or more computer-readable memories, wherein the computer system is capable of performing a method comprising:
processing an input-output services (IOS) record in a storage system control data set (CDS);
creating a list of path group identifiers (PGIDs);
identifying the created list of PGIDs associated with a production sysplex;
associating the identified list of PGIDs with the production sysplex;
identifying a plurality of sysplex names not associated with the production sysplex;
identifying a logical device swap occurred; and
in response to the logical device swap, creating a soft fence command.

9. The computer system of claim 8 , further comprises:
issuing the soft fence command.

10. The computer system of claim 8 , wherein the soft fence command includes a logical subsystem (LSS) command, a device bitmap and an action field.

11. The computer system of claim 8 , further comprising:
identifying a plurality of logical device swaps occurred;
in response to the plurality of logical device swaps, creating a soft fence command for each logical device swap; and
issuing the new created soft fence commands.

12. The computer system of claim 8 , wherein the soft fence command is a read fence, a write fence or a read and write fence.

13. The computer system of claim 9 , wherein the list of PGIDs specifies which system is a read fenced system, a write fenced system or a read fenced and write fenced system.

14. The computer system of claim 10 , wherein the action field includes a type of the soft fence command issued.

15. A computer program product for soft fencing, comprising:
one or more computer-readable tangible storage media and program instructions stored on at least one of the one or more computer-readable tangible storage media, the program instructions executable by a processor to cause the processor to perform a method comprising:
processing an input-output services (IOS) record in a storage system control data set (CDS);
creating a list of path group identifiers (PGIDs);
identifying the created list of PGIDs associated with a production sysplex;
associating the identified list of PGIDs with the production sysplex;
identifying a plurality of sysplex names not associated with the production sysplex;
identifying a logical device swap occurred; and
in response to the logical device swap, creating a soft fence command.

16. The computer program product of claim 15 , further comprises:
issuing the soft fence command.

17. The computer program product of claim 15 , wherein the soft fence command includes a logical subsystem (LSS) command, a device bitmap and an action field.

18. The computer program product of claim 15 , further comprising:
identifying a plurality of logical device swaps occurred;
in response to the plurality of logical device swaps, creating a soft fence command for each logical device swap; and
issuing the new created soft fence commands.

19. The computer program product of claim 15 , wherein the soft fence command is a read fence, a write fence or a read and write fence.

20. The computer program product of claim 16 , wherein the list of PGIDs specifies which system is a read fenced system, a write fenced system or a read fenced and write fenced system.

Assignees

• IBM

Inventors

• Compton Scott B
• Hanif Tariq
• Hoang Tri M
• Mcbride Gregory E
• Mellgren Carol S
• Rooney William J

Classifications

• G06F3/0664

  at device level, e.g. emulation of a storage device or system · CPC title

• G06F3/0634

  by changing the state or mode of one or more devices · CPC title

• G06F3/0631

  by allocating resources to storage systems · CPC title

• G06F3/0622

  in relation to access · CPC title

• G06F3/067 Primary

  Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS] · CPC title