Leveraging array operations at virtualized storage processor level

Patent metadata

Field	Value
Publication number	US-9535630-B1
Application number	US-201313928610-A
Country	US
Kind code	B1
Filing date	Jun 27, 2013
Priority date	Jun 27, 2013
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A technique for managing data storage operations in a data storage system having a file-based front end system and a block-based back end array includes provisioning a set of storage resources on the array for use exclusively with one or more virtualized storage processors (VSPs), where each VSP identifies multiple file systems. In response to a management command to perform a data storage operation on a VSP, the back-end array performs the specified operation on the provisioned set of storage resources. Thus, the back-end array performs the data operation exclusively on the VSP (or on multiple VSPs) and therefore on all of its constituent file systems as one.

First claim

What is claimed is:

1. A method of managing data storage operations, comprising:
directing a data storage array coupled to a storage processor to provision a set of storage resources on the array for storing multiple file systems of a VSP (virtualized storage processor) operated by the storage processor;
operating multiple VSPs, including the VSP, on the storage processor, each of the VSPs including a respective plurality of file systems stored in a respective set of storage resources on the array such that each set of storage resources on the array is exclusive to a respective one of the VSPs;
in response to the storage processor receiving file-based requests to access files of the file systems of the VSP, sending block-based requests to the array to access content of the files from the set of storage resources; and
in response to an issuance of a management command to perform a data operation on the VSP, directing the array to perform the data operation on each of the set of storage resources for the VSP but not on any sets of storage resources of other VSPs of the multiple VSPs, thereby effecting the data operation by the array exclusively on the file systems of the VSP together as a group.

2. The method of claim 1 , wherein directing the array to provision the set of storage resources is performed in response to receiving a request to create a VSP, and wherein directing the array to provision the set of storage resources includes directing the array to provision a set of LUNs (logical unit numbers) in the array and to make the set of LUNs available to the storage processor via block-based requests from the storage processor.

3. The method of claim 2 , further comprising:
creating a storage pool for the VSP on the storage processor;
assigning the set of LUNs in the array to the storage pool;
adding storage slices derived from the set of LUNs to the storage pool; and
provisioning at least some of the slices from the storage pool to the file systems of the VSP for storing data and metadata of the file systems in the slices of the pool derived from the set of LUNs in the array.

4. The method of claim 3 , wherein, in response to the issuance of the management command, the method further comprises, for each of the set of LUNs, the storage processor directing the array to perform the data operation on the respective LUN.

5. The method of claim 3 , further comprising, by the storage processor:
directing the array to form a consistency group that includes the set of LUNs; and
storing an identifier of the consistency group,
wherein directing the array to perform the data operation on each of the set of storage resources includes (i) retrieving the identifier of the consistency group and (ii) issuing a command to the array to perform the data operation on the consistency group specified by the retrieved identifier without specifying the LUNs individually.

6. The method of claim 5 , wherein directing the array to form the consistency group and storing the identifier of the consistency group are performed in response to receiving the request to create the VSP.

7. The method of claim 5 , wherein directing the array to form the consistency group and storing the identifier of the consistency group are performed in response to the issuance of the management command to perform the data operation on the VSP.

8. The method of claim 3 , further comprising expanding the storage pool by one of:
(i) directing the array to extend at least one of the set of LUNs; and
(ii) directing the array to add a new LUN of the array to the set of LUNs.

9. The method of claim 3 , wherein each slice is derived from a range of a respective LUN of the set of LUNs, and wherein the method further comprises shrinking the storage pool, wherein shrinking the storage pool includes:
evacuating a slice in the storage pool of data and metadata pertaining to the set of file systems; and
sending a message to the array (i) identifying the range of the particular LUN from which the evacuated slice is derived and (ii) directing the array to free the identified range of the LUN.

10. The method of claim 9 , wherein the LUN has been thinly provisioned from an array pool of the array, and wherein directing the array to free the identified range of the LUN includes directing the array to return the space occupied by the identified range of the LUN back to the array pool for repurposing to other LUNs that are not part of the set of LUNs.

11. The method of claim 9 , wherein the LUN has a predetermined size and has been densely provisioned, and wherein shrinking the storage pool further includes:
directing the array to move all data and metadata for the set of file systems away from a range of the LUN beyond a predetermined offset; and
directing the array to change the size of the LUN so that the LUN itself becomes smaller and does not extend beyond the predetermined offset, such that storage freed from the end of the LUN can be repurposed to other LUNs that are not part of the set of LUNs.

12. The method of claim 9 , wherein the LUN has a predetermined size and has been densely provisioned, and wherein shrinking the storage pool further includes directing the array to delete the LUN.

13. The method of claim 3 , wherein the data operation includes one of (i) a snap operation and (ii) a replication operation.

14. The method of claim 1 , wherein each of the multiple VSPs aggregates the respective plurality of file systems and defines a set of file-based servers through which the plurality of file systems is accessed, the set of file-based servers including at least one of an NFS (Network File System) server or a CIFS (Common Internet File System) server.

15. The method of claim 14 , wherein the multiple VSPs operating on the storage processor and share a common IO stack operating on the storage processor, the IO stack receiving requests from hosts to perform file-based operations on files of the VSPs.

16. The method of claim 1 , wherein the management command is a command to take a snap of the VSP, and wherein directing the array to take a snap of the VSP includes directing the array to snap the set of storage resources on which the file systems of the VSP are stored, but not to snap any set of storage resources on which file systems of any other VSP operated on the storage processor are stored.

17. The method of claim 1 , wherein the data operation is for performing one of compression, encryption, or de-duplication on the VSP, and wherein directing the array to perform the data operation on the VSP includes directing the array to perform one of compression, encryption, or de-duplication on the set of storage resources on which the file systems of the VSP are stored, but not to perform the data operation on any set of storage resources on which file systems of any other VSP operated on the storage processor are stored.

18. A data storage apparatus, comprising:
a storage processor including a set of processing units and memory, coupled to the set of processing units, the memory storing executable instructions, which when executed by the set of processing units cause the set of processing units to perform a method of managing data storage operations, wherein the method comprises:
directing a data storage array coupled to the storage processor of the data storage apparatus to provision a set of storage resources on the array for storing multiple file systems of a VSP (virtualized storage processor) operated by the storage processor;
operating multiple VSPs, including the VSP, on the storage processor, eac

Assignees

• Emc Corp
• Emc Ip Holding Co Llc

Inventors

• Bono Jean-Pierre
• Corniquet Frederic
• De Forest Miles A
• Tummala Himabindu
• Forrester Walter C

Classifications

• G06F3/0689 Primary

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

• G06F3/0605

  by facilitating the interaction with a user or administrator · CPC title

• G06F3/065 Primary

  Replication mechanisms · CPC title

• G06F3/0631

  by allocating resources to storage systems · CPC title