System and method for storage management

Patent metadata

Field	Value
Publication number	US-9405488-B1
Application number	US-201313923854-A
Country	US
Kind code	B1
Filing date	Jun 21, 2013
Priority date	Jun 21, 2013
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A method, computer program product, and computing system for receiving, on an active storage processor from a passive storage processor, a join request indicator. The join request indicator indicates that the passive storage processor wants to transition to an active status. The active storage processor and the passive storage processor are both coupled to a data array. A status change indicator is provided from the active storage processor to the passive storage processor, wherein the status change indicator indicates that the passive-to-active transition of the passive storage processor has been initiated. A first data array status indicator is received on the active storage processor from the passive storage processor, wherein the first data array status indicator indicates the status of the data array as seen by the passive storage processor. A second data array status indicator is generated on the active storage processor, wherein the second data array status indicator indicates the status of the data array as seen by the active storage processor.

First claim

What is claimed is:

1. A computer-implemented method comprising:
receiving, on an active storage processor from a passive storage processor, a join request indicator, wherein:
the join request indicator indicates that the passive storage processor wants to transition to an active status, and
the active storage processor and the passive storage processor are both coupled to a data array;

providing, from the active storage processor to the passive storage processor, a status change indicator, wherein the status change indicator indicates that the passive-to-active transition of the passive storage processor has been initiated;
receiving, on the active storage processor from the passive storage processor, a first data array status indicator, wherein the first data array status indicator indicates the status of the data array as seen by the passive storage processor, wherein the active storage processor receives the first data array status indicator by receiving a mirrored copy of the first data array status indicator generated by the passive storage processor after being locally stored at the passive storage processor;
generating, on the active storage processor, a second data array status indicator, wherein the second data array status indicator indicates the status of the data array as seen by the active storage processor;
comparing the first data array status indicator to the second data array status indicator to determine if the active storage processor and the passive storage processor are seeing the same status for the data array; and
when the active storage processor and the passive storage processor are not seeing the same status for the data array, normalizing the status of the data array so that the active storage processor and the passive storage processor see the same status for the data array, wherein normalizing the status of the data array is accomplished by either normalizing the data array status of the active storage processor to the data array status of the passive storage processor or normalizing the data array status of the passive storage processor to the data array status of the active storage processor;
when normalizing the data array status of the active storage processor to the data array status of the passive storage processor, preventing the active storage processor from seeing one or more drives included within the data array;
when normalizing the data array status of the passive storage processor to the data array status of the active storage processor, preventing the passive storage processor from seeing one or more drives included within the data array.

2. The computer-implemented method of claim 1 further comprising:
if the active storage processor and the passive storage processor are seeing the same status for the data array:
providing, from the active storage processor to the passive storage processor, a first syncing indicator, wherein the first syncing indicator indicates that the active storage processor is ready to begin synchronization, and
receiving, on the active storage processor from the passive storage processor, a second synching indicator, wherein the second syncing indicator indicates that the passive storage processor is ready to begin synchronization.

3. The computer-implemented method of claim 2 further comprising:
in response to receiving the second synching indicator:
stopping all out-of-band activities being performed on the active storage processor,
providing, from the active storage processor to the passive storage processor, a first joined indicator, wherein the first joined indicator indicates that the active storage processor is ready for the passive storage processor to transition to an active state, and
receiving, on the active storage processor from the passive storage processor, a second joined indicator, wherein the second joined indicator indicates that the passive storage processor has transitioned to an active state.

4. The computer-implemented method of claim 1 wherein normalizing the status of the data array further includes:
redirecting IO commands between the active and the passive storage processors.

5. A computer program product residing on a non-transitory computer readable medium having a plurality of instructions stored thereon which, when executed by a processor, cause the processor to perform operations comprising:
receiving, on an active storage processor from a passive storage processor, a join request indicator, wherein:
the join request indicator indicates that the passive storage processor wants to transition to an active status, and
the active storage processor and the passive storage processor are both coupled to a data array;

providing, from the active storage processor to the passive storage processor, a status change indicator, wherein the status change indicator indicates that the passive-to-active transition of the passive storage processor has been initiated;
receiving, on the active storage processor from the passive storage processor, a first data array status indicator, wherein the first data array status indicator indicates the status of the data array as seen by the passive storage processor, wherein the active storage processor receives the first data array status indicator by receiving a mirrored copy of the first data array status indicator generated by the passive storage processor after being locally stored at the passive storage processor;
generating, on the active storage processor, a second data array status indicator, wherein the second data array status indicator indicates the status of the data array as seen by the active storage processor;
comparing the first data array status indicator to the second data array status indicator to determine if the active storage processor and the passive storage processor are seeing the same status for the data array; and
when the active storage processor and the passive storage processor are not seeing the same status for the data array, normalizing the status of the data array so that the active storage processor and the passive storage processor see the same status for the data array, wherein normalizing the status of the data array is accomplished by either normalizing the data array status of the active storage processor to the data array status of the passive storage processor or normalizing the data array status of the passive storage processor to the data array status of the active storage processor;
when normalizing the data array status of the active storage processor to the data array status of the passive storage processor, preventing the active storage processor from seeing one or more drives included within the data array;
when normalizing the data array status of the passive storage processor to the data array status of the active storage processor, preventing the passive storage processor from seeing one or more drives included within the data array.

6. The computer program product of claim 5 further comprising instructions for:
if the active storage processor and the passive storage processor are seeing the same status for the data array:
providing, from the active storage processor to the passive storage processor, a first syncing indicator, wherein the first syncing indicator indicates that the active storage processor is ready to begin synchronization, and
receiving, on the active storage processor from the passive storage processor, a second synching indicator, wherein the second syncing indicator indicates that the passive storage processor is ready to begin synchronization.

7. The computer program product of claim 6 further comprising instructions for:
in response to receiving the second synching indicator:
stopping all out-of-band activities being performed on the active s

Assignees

• Emc Corp

Inventors

• Foley Robert P
• Puhov Peter
• Chiu Naizhong

Classifications

• G06F11/2092 Primary

  Techniques of failing over between control units · CPC title

• G06F11/2089

  Redundant storage control functionality · CPC title

• G06F11/1658

  Data re-synchronization of a redundant component, or initial sync of replacement, additional or spare unit · CPC title

• G06F3/0689 Primary

  Disk arrays, e.g. RAID, JBOD · CPC title