Snapshot replication
A computer implemented method, system, and program product for replicating writeable snapshots in a continuous replication environment, the method comprising intercepting a command to create a snapshot of a virtual volume, putting a snapshot create message in a journal at a replication site; and allowing the creation of the snapshot.
1. A computer implemented method for replicating creation of a writeable snapshot in a continuous replication environment, the method comprising:
intercepting, at a splitter running in a hypervisor, a hypervisor API command to create a snapshot of a virtual volume in the hypervisor on a production site;
sending a copy of the intercepted command to create the snapshot of the virtual volume in the hypervisor to a hypervisor at a replication site;
putting a snapshot create message corresponding to the copy of the intercepted hypervisor API command to create the snapshot in a journal at the replication site; wherein the journal includes replicated IO data to the volume intercepted by the splitter at the production site; wherein execution of the hypervisor API snapshot create message causes a snapshot to be created on the replication site based data replicated to the replication site; and
creating the snapshot at the production site by forwarding the intercepted hypervisor API command to create the snapshot from the splitter; wherein execution of the copy of the intercepted hypervisor API command to create the snapshot on the replication site creates a second snapshot on the replication site that corresponds to the snapshot on the production site.
2. The method of claim 1 further comprising:
creating the snapshot of the virtual volume at the replication site;
applying data from the journal to the replica volume; and
reading a message to create the snapshot.
3. The method of claim 1 further comprising configuring a consistency group replicating the volume to replicate the snapshot.
4. The method of claim 1 further comprising configuring the splitter to split IO to the created snapshot on the replication site.
5. The method of claim 4 further comprising logging the IO to the snapshot on the production site in the journal at the replication site.
6. The method of claim 1 wherein the intercepted hypervisor API command to create the snapshot is a VASA API command to create a snapshot.
7. A computer program product for replicating creation of a writeable snapshot in a continuous replication environment:
a non-transitory computer readable medium encoded with computer executable program code, the computer executable program code programmed to cause the one or more processors to perform:
intercepting, at a splitter running in a hypervisor, a hypervisor API command to create a snapshot of a virtual volume in the hypervisor on a production site;
sending a copy of the intercepted command to create the snapshot of the virtual volume to a hypervisor at a replication site;
putting a snapshot create message corresponding to the copy of the intercepted hypervisor API command to create the snapshot in a journal at the replication site; wherein the journal includes replicated IO data to the volume intercepted by the splitter at the production site; wherein execution of the hypervisor API snapshot create message causes a snapshot to be created on the replication site based data replicated to the replication site; and
creating the snapshot at the production site by forwarding the intercepted hypervisor API command to create the snapshot from the splitter; wherein the execution of the copy of the intercepted hypervisor API command to create the snapshot on the replication site creates a second snapshot that corresponds to the snapshot on the production site.
8. The computer program product of claim 7 the computer executable program code further programmed to cause the one or more processors to perform:
creating the snapshot of the virtual volume at the replication site;
applying the data from the journal to the replica volume; and
reading a message to create the snapshot.
9. The computer program product of claim 7 the computer executable program code further programmed to cause the one or more processors to perform: configuring a consistency group replicating the volume to replicate the snapshot.
10. The computer program product of claim 7 the computer executable program code further programmed to cause the one or more processors to perform: configuring the splitter split IO to the created snapshot on the replication site.
11. The computer program product of claim 10 the computer executable program code further programmed to cause the one or more processors to perform: logging the IO to the snapshot in the journal at the replication site.
12. A system for replicating creation of a writeable snapshot in a continuous replication environment, the system comprising:
a virtual volume in a hypervisor on a production site;
a replication site;
one or more processors;
computer programmable memory; and
computer-executable logic code stored in the computer programmable memory, wherein the computer-executable program logic code is programmed to cause the one or more processors to perform:
intercepting, at a splitter running in a hypervisor, a hypervisor API command to create a snapshot of a virtual volume in the hypervisor on a production site;
sending a copy of the intercepted hypervisor API command to create the snapshot to a hypervisor at a replication site;
putting a snapshot create message corresponding to the copy of the intercepted hypervisor API command to create the snapshot in a journal at the replication site; wherein the journal includes replicated IO data to the volume intercepted by the splitter at the production site; wherein execution of the hypervisor API snapshot create message causes a snapshot to be created on the replication site based on data replicated to the replication site; and
creating the snapshot at the production site by forwarding the intercepted hypervisor API command to create the snapshot from the splitter; wherein execution of the copy of the intercepted hypervisor API command to create the snapshot on the replication site creates a second snapshot on the replication site that corresponds to the snapshot on the production site.
13. The system of claim 12 wherein the computer-executable logic code is further configured to cause the one or more processors to perform:
creating the snapshot of the virtual volume at the replication site;
applying data from the journal to the replica volume; and
reading a message to create snapshot.
14. The system of claim 12 wherein the computer-executable logic code is further configured to cause the one or more processors to perform:
configuring a consistency group replicating the volume to replicate the snapshot.
15. The system of claim 12 wherein the computer-executable logic code is further configured to cause the one or more processors to perform:
configuring the splitter splitting the volume to split IO to the created snapshot on the replication site.
16. The system of claim 12 wherein the computer-executable logic code is further configured to cause the one or more processors to perform:
logging the IO to the snapshot in the journal at the replication site.