Systems and methods for continuous data protection comprising storage of completed I/O requests intercepted from an I/O stream using touch points
Example embodiments relate generally to systems and methods for continuous data protection (CDP) and more specifically to an input and output (I/O) filtering framework and log management system to seek a near-zero recovery point objective (RPO).
1. A method, comprising:
accessing, in an input/output (I/O) path between a virtual machine (VM) and a virtualization server, an I/O stream comprising records of completed I/O requests and records of uncompleted I/O requests that are exchanged between the VM and the virtualization server;
configuring an I/O touchpoint in the I/O stream, the I/O touchpoint associated with I/O request cancellation;
filtering out one or more records of one or more canceled I/O requests detected using the I/O touchpoint associated with I/O request cancellation, wherein only the records of the completed I/O requests in the I/O stream are captured based at least in part on filtering out the one or more canceled I/O requests; and
forming, based at least in part on the filtering, a snapshot-log chain by associating only the records of the captured completed I/O requests with a snapshot.
2. The method of claim 1 , wherein the I/O touchpoint associated with I/O request cancellation is configured in the I/O stream prior to capturing only the records of the completed I/O requests.
3. The method of claim 1 , further comprising:
storing, from among the records of the completed I/O requests and the records of the uncompleted I/O requests, only the records of the completed I/O requests at a backup site based at least in part on the capturing.
4. The method of claim 3 , wherein the snapshot is stored at the backup site.
5. The method of claim 1 , wherein capturing only the records of the completed I/O requests comprises:
filtering I/O requests in the I/O stream to intercept only the records of the completed I/O requests.
6. The method of claim 1 , further comprising:
establishing, at an interception point in the I/O path, a filter framework comprising an I/O stack and an I/O filter.
7. The method of claim 6 , wherein the filter framework further comprises a filter driver, and the method further comprises:
configuring the filter driver to intercept only the completed I/O requests in the I/O stream using the I/O touchpoint, wherein only the records of the completed I/O requests are captured based at least in part on configuring the filter driver.
8. The method of claim 6 , wherein:
the I/O request cancellation is a distributed I/O request cancellation of a plurality of I/O requests comprising a first set of completed I/O requests and a second set of uncompleted I/O requests, and
the method further comprises managing the distributed I/O request cancellation at the I/O stack of the filter framework.
9. The method of claim 1 , further comprising:
receiving, after forming the snapshot-log chain, a request for recoverable data; and
sending, in response to the request for recoverable data, data to a replication target based at least on a portion of the snapshot-log chain.
10. An apparatus, comprising:
at least one processor; and
memory storing instructions that are executable by the at least one processor to cause the apparatus to:
access, in an input/output (I/O) path between a virtual machine (VM) and a virtualization server, an I/O stream comprising records of completed I/O requests and records of uncompleted I/O requests that are exchanged between the VM and the virtualization server;
configure an I/O touchpoint in the I/O stream, the I/O touchpoint associated with I/O request cancellation;
filter out one or more records of one or more canceled I/O requests detected using the I/O touchpoint associated with I/O request cancellation, wherein the instructions are executable by the at least one processor to cause the apparatus to capture only the records of the completed I/O requests in the I/O stream based at least in part on filtering out the one or more canceled I/O requests; and
form, based at least in part on the filtering, a snapshot-log chain by associating only the records of the captured completed I/O requests with a snapshot.
11. The apparatus of claim 10 , wherein the instructions are executable by the at least one processor to cause the apparatus to:
configure the I/O touchpoint associated with I/O request cancellation in the I/O stream prior to capturing only the records of the completed I/O requests.
12. The apparatus of claim 10 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
store, from among the records of the completed I/O requests and the records of the uncompleted I/O requests, only the records of the completed I/O requests at a backup site based at least in part on the capturing.
13. The apparatus of claim 10 , wherein, to capture only the records of the completed I/O requests, the instructions are further executable by the at least one processor to cause the apparatus to:
filter I/O requests in the I/O stream to intercept only the records of the completed I/O requests.
14. The apparatus of claim 10 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
establish, at an interception point in the I/O path, a filter framework comprising an I/O stack and an I/O filter.
15. The apparatus of claim 10 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
receive, after forming the snapshot-log chain, a request for recoverable data; and
send, in response to the request for recoverable data, data to a replication target based at least on a portion of the snapshot-log chain.
16. A non-transitory, computer-readable medium that stores instructions that are executable by at least one processor of an electronic device to cause the electronic device to:
access, in an input/output (I/O) path between a virtual machine (VM) and a virtualization server, an I/O stream comprising records of completed I/O requests and records of uncompleted I/O requests that are exchanged between the VM and the virtualization server;
configure an I/O touchpoint in the I/O stream, the I/O touchpoint associated with I/O request cancellation;
filter out one or more records of one or more canceled I/O requests detected using the I/O touchpoint associated with I/O request cancellation, wherein the instructions are executable by the at least one processor to cause the electronic device to capture only the records of the completed I/O requests in the I/O stream based at least in part on filtering out the one or more canceled I/O requests; and
form, based at least in part on the filtering, a snapshot-log chain by associating only the records of the captured completed I/O requests with a snapshot.
17. The non-transitory, computer-readable medium of claim 16 , wherein the instructions are further executable by the at least one processor to cause the electronic device to:
store, from among the records of the completed I/O requests and the records of the uncompleted I/O requests, only the records of the completed I/O requests at a backup site based at least in part on the capturing.
18. The non-transitory, computer-readable medium of claim 16 , wherein, to capture only the records of the completed I/O requests, the instructions are executable by the at least one processor to cause the electronic device to:
filter I/O requests in the I/O stream to intercept only the records of the completed I/O requests.
19. The non-transitory, computer-readable medium of claim 16 , wherein the instructions are further executable by the at least one processor to cause the electronic device to:
establish, at an interception point in the I/O path, a filter framework comprising an I/O stack and an I/O filter.
20. The non-transitory, computer-readable medium of claim 16 , wherein the instructions are further executable by the at least one processor to cause the electronic device to:
receive, after forming the snapshot-log chain, a request for recoverable data; and
send, in response to the request for recoverable data, data to a replication target based at least on a portion of the snapshot-log chain.