Apparatus and method to replicate remote virtual volumes to local physical volumes

• US 8,346,721 B2
• Filed: 07/15/2009
• Issued: 01/01/2013
• Est. Priority Date: 07/15/2009
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Acedo, Mario Francisco, Cervantes, Ezequiel, Jennas, Paul Anthony II, Peipelman, Jason Lee, Ward, Matthew John
• Primary Examiner(s): OBERLY, VAN HONG
• Application Number:
  US12/503,779
• Publication Number:
  US 20110016082A1
• Time in Patent Office: 1,266 Days
• Field of Search: 707/610
• US Class Current: 707/610
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]

Abstract

An automated method to replicate remote virtual files to local physical files is presented, wherein the method provides a replication algorithm comprising computer readable program code that can be used by a programmable computer processor to replicate the (N) remote virtual volumes to (N) local physical volumes, such that a computing device integral with those (N) local physical volumes can read data from, and write data to, each of the locally replicated virtual volumes without modifying volume assignments and without reconfiguring the computing device to communicate with the (N) local physical volumes.

Claims

1. A method to replicate remote virtual files to local physical files, comprising:

providing (N) remote virtual volumes, wherein a computing device can read data from, and write data to, each of said (N) remote virtual volumes;

replicating without manual input said (N) remote virtual volumes to (N) local physical volumes, such that said computing device can read data from, and write data to, each of said (N) remote virtual volumes without modifying volume assignments and without reconfiguring the computing device to communicate with said (N) local physical volumes;

wherein said replicating step further comprises;

determining a value of (N);

selecting, for each value of (i), an (i)th remote virtual volume, wherein (i) is greater than or equal to 1 and less than or equal to (N);

determining, for each value of (i), an (i)th volume identifier;

determining, for each value of (i), an (i)th volume size;

determining, for each value of (i), an (i)th volume configuration;

determining, for each value of (i), if an available local physical volume in communication with said computing device comprises said (i)th volume size;

operative if an available local physical volume comprises said (i)th volume size, designating said local physical volume as an (i)th physical volume and unavailable;

operative if available local physical volumes do not comprise, for each value of (i), a local physical volume comprising said (i)th volume size;

setting a polling time interval;

determining at an expiration of said polling time interval, if, for each value of (i), an available local physical volume comprises said (i)th volume size;

operative if at an expiration of said polling time interval available local physical volumes do not comprise, for each value of (i), a local physical volume comprising said (i)th volume size, ending.

2. The method of claim 1, wherein said replicating step further comprises:

forming a computing device file access database;

selecting, for each value of (i), an (i)th remote virtual volume, wherein said selected (i)th remote virtual volume comprises (M) files, wherein (M) is greater than 1;

selecting, for each value of (j), a (j)th file from said (M) files, wherein (j) is greater than or equal to 1 and less than or equal to (M);

determining if said computing device has access rights for said (j)th file;

operative if said computing device has access rights to said (j)th file, associating said computing device with said (j)th file in said computing device file access database.

3. The method of claim 2, wherein said replicating step further comprises:

determining if, for each value of (i), said (i)th volume identifier has been assigned to an (i)th physical volume;

operative if, for each value of (i), said (i)th volume identifier has been assigned to an (i)th physical volume;

copying, for each value of (i), said (i)th plurality of files from said (i)th remote virtual volume to said (i)th physical volume.

4. The method of claim 3, wherein said replicating step further comprises:

determining, for each value of (i), an (i)th remote virtual volume configuration;

configuring said (i)th physical volume using said (i)th remote virtual volume configuration.

5. The method of claim 3, wherein said replicating step further comprises:

for each value of (i), quiescing and deleting said (i)th remote virtual volume; and

assigning said (i)th volume identifier to said (i)th physical volume.

6. The method of claim 5, wherein said replicating step further comprises encoding in said computing device said computing device file access database.

7. A storage controller comprising a computer readable medium comprising computer readable program code encoded therein to replicate remote virtual volumes to local volumes, wherein a computing device can read data from, and write data to, each of the remote virtual volumes, the computer readable program code comprising a series of computer readable program steps to effect replicating without manual input (N) remote virtual volumes to (N) local physical volumes, such that said computing device can read data from, and write data to, each of said (N) remote virtual volumes without modifying volume assignments and without reconfiguring the computing device to communicate with said (N) local physical volumes;

wherein said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprising a series of computer readable program steps to effect;

determining a value of (N);

selecting, for each value of (i), an (i)th remote virtual volume, wherein (i) is greater than or equal to 1 and less than or equal to (N);

determining, for each value of (i), an (i)th volume identifier;

determining, for each value of (i), an (i)th volume size;

determining, for each value of (i), an (i)th volume configuration;

determining, for each value of (i), if an available local physical volume in communication with said computing device comprises said (i)th volume size;

operative if an available local physical volume comprises said (i)th volume size, designating said local physical volume as;

an (i)th physical volume, and unavailable;

wherein said computer readable program code to determine if an available local physical volume in communication with said computing device comprises said (i)th volume size further comprises a series of computer readable program steps to effect;

operative if available local physical volumes do not comprise, for each value of (i), a local physical volume comprising said (i)th volume size;

setting a polling time interval;

determining at an expiration of said polling time interval, if, for each value of (i), an available local physical volume comprises said (i)th volume size;

operative if at an expiration of said polling time interval available local physical volumes do not comprise, for each value of (i), a local physical volume comprising said (i)th volume size, not replicating said remote virtual volumes to said local volumes.

8. The storage controller of claim 7, wherein said (i)th remote virtual volume comprises (M) files, said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprising a series of computer readable program steps to effect:

forming a computing device file access database;

selecting a (j)th file from said (M) files, wherein (j) is greater than or equal to 1 and less than or equal to (M);

determining if said computing device has access rights for said (j)th file;

operative if said computing device has access rights to said (i)th file, associating said computing device with said (j)th file in said computing device file access database.

9. The storage controller of claim 8, said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprising a series of computer readable program steps to effect:

determining if, for each value of (i), said (i)th volume identifier has been assigned to an (i)th physical volume;

operative if, for each value of (i), said (i)th volume identifier has been assigned to an (i)th physical volume;

copying, for each value of (i), said (i)th plurality of files from said (i)th remote virtual volume to said (i)th physical volume.

10. The storage controller of claim 9, said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprising a series of computer readable program steps to effect:

determining, for each value of (i), an (i)th remote virtual volume configuration;

configuring said (i)th physical volume using said (i)th remote virtual volume configuration.

11. The storage controller of claim 10, said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprising a series of computer readable program steps to effect:

for each value of (i), quiescing and deleting said (i)th remote virtual volume;

assigning said (i)th volume identifier to said (i)th physical volume;

encoding in said computing device said computing device file access database.

12. A computer program product encoded in a computer readable medium and useable with a programmable computer processor to replicate remote virtual volumes to local volumes, wherein a computing device can read data from, and write data to, each of said remote virtual volumes, the computer program product comprising:

computer readable program code which causes said programmable processor to replicate without manual input (N) remote virtual volumes to (N) local physical volumes, such that said computing device can read data from, and write data to, each of said (N) remote virtual volumes without modifying volume assignments and without reconfiguring the computing device to communicate with said (N) local physical volumes;

wherein said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprises;

computer readable program code which causes said programmable processor to determine a value of (N);

computer readable program code which causes said programmable processor to select, for each value of (i), an (i)th remote virtual volume, wherein (i) is greater than or equal to 1 and less than or equal to (N);

computer readable program code which causes said programmable processor to determine, for each value of (i), an (i)th volume identifier;

computer readable program code which causes said programmable processor to determine, for each value of (i), an (i)th volume size;

computer readable program code which causes said programmable processor to determine, for each value of (i), an (i)th volume configuration;

computer readable program code which causes said programmable processor to determine if an available local physical volume in communication with said computing device comprises said (i)th volume size;

computer readable program code which, if an available local physical volume comprises said (i)th volume size, causes said programmable processor to designate said local physical volume as;

an (i)th physical volume, and unavailable;

computer readable program code which, if available local physical volumes do not comprise, for each value of (i), a local physical volume comprising said (i)th volume size, causes said programmable processor to set a polling time interval and determine at an expiration of said polling time interval, if, for each value of (i), an available local physical volume comprises said (i)th volume size;

computer readable program code which, if at an expiration of said polling time interval available local physical volumes do not comprise, for each value of (i), a local physical volume comprising said (i)th volume size, causes said programmable processor to terminate replication of said remote virtual volumes to said local physical volumes.

13. The computer program product of claim 12, wherein said (i)th remote virtual volume comprises (M) files, said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprises:

computer readable program code which causes said programmable processor to form a computing device file access database;

computer readable program code which causes said programmable processor to select a (j)th file from said (M) files, wherein (j) is greater than or equal to 1 and less than or equal to (M);

computer readable program code which causes said programmable processor to determine if said computing device has access rights for said (j)th file;

computer readable program code which, if said computing device has access rights to said (i)th file, causes said programmable processor to associate said computing device with said (j)th file in said computing device file access database.

14. The computer program product of claim 13, said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprises:

computer readable program code which causes said programmable processor to determine if, for each value of (i), said (i)th volume identifier has been assigned to an (i)th physical volume;

computer readable program code which, if said (i)th volume identifier has been assigned to an (i)th physical volume, causes said programmable processor to copy said (i)th plurality of files from said (i)th remote virtual volume to said (i)th physical volume.

15. The computer program product of claim 14, said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprises:

computer readable program code which causes said programmable processor to determine, for each value of (i), an (i)th remote virtual volume configuration;

computer readable program code which, for each value of (i), causes said programmable processor to configure said (i)th physical volume using said (i)th remote virtual volume configuration.

16. The computer program product of claim 15, said computer readable program code to replicate said (N) remote virtual volumes to (N) local physical volumes further comprises:

computer readable program code which causes said programmable processor to for each value of (i), quiesce and delete said (i)th remote virtual volume;

computer readable program code which, for each value of (i), causes said programmable processor to assign said (i)th volume identifier to said (i)th physical volume;

computer readable program code which causes said programmable processor to encode in said computing device said computing device file access database.