Accessing a global vault in multiple dispersed storage networks

• US 8,626,871 B2
• Filed: 05/11/2011
• Issued: 01/07/2014
• Est. Priority Date: 05/19/2010
• Status: Active Grant

• Current Assignee: Pure Storage, Inc.
• Original Assignee: Cleversafe Incorporated (International Business Machines Corporation)
• Inventors: Resch, Jason K., Grube, Gary W., Markison, Timothy W.
• Primary Examiner(s): RECEK, JASON D
• Application Number:
  US13/105,127
• Publication Number:
  US 20110289215A1
• Time in Patent Office: 972 Days
• Field of Search: 709/224, 709/225, 709213-214, 709217-218
• US Class Current: 709/217
• CPC Class Codes: G06F 11/1092 Rebuilding, e.g. when physically replacing a failing disk
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence
• CPC Class Codes: G06F 2211/1028 Distributed, i.e. distributed RAID systems with parity
• 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]
• CPC Class Codes: H04L 67/52 specially adapted for the location of the user terminal

Abstract

A method begins by a processing module receiving a dispersed storage network (DSN) access request and determining whether the DSN access request is associated with a local DSN vault or a global DSN vault, wherein the local DSN vault is contained within a DSN of a plurality of DSNs and the global DSN vault is contained within at least some of the plurality of DSNs. The method continues with the processing module identifying a primary DSN of the plurality of DSNs and facilitating processing of the DSN access request by the primary DSN when the DSN access request is associated with the global DSN vault.

Claims

1. A method for execution by a computing device, the method comprises:

receiving a dispersed storage network (DSN) access request;

determining whether the DSN access request is associated with a local DSN vault or a global DSN vault, wherein the local DSN vault is contained within a DSN of a plurality of DSNs and the global DSN vault is contained within at least some of the plurality of DSNs, wherein each of the plurality of DSNs includes a plurality of storage units, wherein the local DSN vault is a virtual memory space of at least some of the plurality of storage units of the DSN, and wherein the global DSN vault is a virtual memory space of at least some of the plurality of storage units in each of the least some of the plurality of DSNs; and

when the DSN access request is associated with the global DSN vault;

identifying a primary DSN of the plurality of DSNs; and

facilitating processing of the DSN access request by the primary DSN, wherein the DSN access request identifies a set of encoded data slices and wherein a data segment of data is dispersed storage error encoded to produce the set of encoded data slices.

2. The method of claim 1, wherein the determining whether the DSN access request is associated with the local or global DSN vault comprises at least one of:

interpreting a requester identifier of the DSN access request;

interpreting a vault identifier of the DSN access request;

interpreting a data type of the DSN access request;

accessing a table look-up;

interpreting a local or global DSN identifier within the DSN access request; and

querying a naming authority.

3. The method of claim 1, wherein the identifying the primary DSN comprises at least one of:

interpreting a requester identifier of the DSN access request;

interpreting a global vault identifier of the DSN access request;

interpreting a data type of the DSN access request;

accessing a table look-up;

interpreting a global DSN identifier within the DSN access request; and

querying a naming authority.

4. The method of claim 1, wherein the facilitating processing of the DSN access request comprises:

identifying, by a first DSN of the plurality of DSNs, the first DSN as the primary DSN;

processing, by the first DSN, the DSN access request to produce a DSN access response; and

sending the DSN access response to a sender of the DSN access request.

5. The method of claim 1, wherein the facilitating processing of the DSN access request comprises:

identifying, by a first DSN of the plurality of DSNs, a second DSN of the plurality of DSNs as the primary DSN; and

forwarding the DSN access request to the second DSN.

6. The method of claim 1 further comprises:

when the DSN access request is associated with the local DSN vault;

determining whether the DSN access request includes a vault assignment request; and

when the DSN access request includes the vault assignment request, creating the local vault;

when the DSN access request does not include the vault assignment request;

processing the DSN access request to produce a DSN access response; and

sending the DSN access response to a sender of the DSN access request.

7. The method of claim 1 further comprises:

when the DSN access request is associated with the global DSN vault, determining whether the DSN access request includes a vault assignment request; and

when the DSN access request includes the vault assignment request;

sending the vault assignment request to a naming authority; and

receiving a global vault assignment response that identifies the primary DSN.

8. The method of claim 7 further comprises at least one of:

extracting vault assignment information from the global vault assignment response;

storing the vault assignment information; and

sending the vault assignment information to a sender of the DSN access request.

9. A computer of a dispersed storage system that includes a plurality of dispersed storage networks (DSNs), the computer comprises:

an interface;

a memory; and

a processing module operable to;

receive, via the interface, a dispersed storage network (DSN) access request;

determine whether the DSN access request is associated with a local DSN vault or a global DSN vault, wherein the local DSN vault is contained within a DSN of a plurality of DSNs and the global DSN vault is contained within at least some of the plurality of DSNs, wherein each of the plurality of DSNs includes a plurality of storage units, wherein the local DSN vault is a virtual memory space of at least some of the plurality of storage units of the DSN, and wherein the global DSN vault is a virtual memory space of at least some of the plurality of storage units in each of the least some of the plurality of DSNs; and

when the DSN access request is associated with the global DSN vault;

identify a primary DSN of the plurality of DSNs; and

facilitate processing of the DSN access request by the primary DSN, wherein the DSN access request identifies a set of encoded data slices and wherein a data segment of data is dispersed storage error encoded to produce the set of encoded data slices.

10. The computer of claim 9, wherein the processing module functions to determine whether the DSN access request is associated with the local or global DSN vault by at least one of:

interpreting a requester identifier of the DSN access request;

interpreting a vault identifier of the DSN access request;

interpreting a data type of the DSN access request;

accessing a table look-up;

interpreting a local or global DSN identifier within the DSN access request; and

querying, via the interface, a naming authority.

11. The computer of claim 9, wherein the processing module functions to identify the primary DSN by at least one of:

interpreting a requester identifier of the DSN access request;

interpreting a global vault identifier of the DSN access request;

interpreting a data type of the DSN access request;

accessing a table look-up;

interpreting a global DSN identifier within the DSN access request; and

querying, via the interface, a naming authority.

12. The computer of claim 9, wherein the processing module functions to facilitate processing of the DSN access request by:

identifying, by a first DSN of the plurality of DSNs, the first DSN as the primary DSN;

processing, by the first DSN, the DSN access request to produce a DSN access response; and

sending, via the interface, the DSN access response to a sender of the DSN access request.

13. The computer of claim 9, wherein the processing module functions to facilitate processing of the DSN access request by:

identifying, by a first DSN of the plurality of DSNs, a second DSN of the plurality of DSNs as the primary DSN; and

forwarding, via the interface, the DSN access request to the second DSN.

14. The computer of claim 9, wherein the processing module further functions to:

when the DSN access request is associated with the local DSN vault;

determine whether the DSN access request includes a vault assignment request; and

when the DSN access request includes the vault assignment request, create the local vault;

when the DSN access request does not include the vault assignment request;

process the DSN access request to produce a DSN access response; and

send, via the interface, the DSN access response to a sender of the DSN access request.

15. The computer of claim 9, wherein the processing module further functions to:

when the DSN access request is associated with the global DSN vault, determine whether the DSN access request includes a vault assignment request; and

when the DSN access request includes the vault assignment request;

send, via the interface, the vault assignment request to a naming authority; and

receive, via the interface, a global vault assignment response that identifies the primary DSN.

16. The computer of claim 15, wherein the processing module further functions to:

extract vault assignment information from the global vault assignment response;

store, in the memory, the vault assignment information; and

send, via the interface, the vault assignment information to a sender of the DSN access request.