Backup archive management
View Patent ↗Apparatus, systems, and methods may operate to taking a snapshot of an origin volume in conjunction with a backup process in response to receiving a snapshot request by a snapshot service. A persistent time stamp associated with the creation time of the snapshot may be recorded on the origin volume. The persistent time stamp is accessible to the file system process associated with the origin volume in most embodiments. If access to a file is requested, the time the file was last modified may be compared with the persistent time stamp, and if the file modified time is earlier than the persistent time stamp, the file's archive bit can be reset. Otherwise, the archive bit is not reset. Additional apparatus, systems, and methods are disclosed.
1. An apparatus, comprising:
a memory to store an origin volume; and
a processor to execute a snapshot process to take a snapshot of the origin volume in conjunction with a backup process and to record a persistent time stamp associated with the creation time of the snapshot, wherein the persistent time stamp is accessible to a file system process associated with the origin volume, and
wherein the processor is to execute a process to compare the persistent time stamp with a file modified time of a file on the origin volume as part of a file read operation, and when the file modified time is earlier than the persistent time stamp, to reset an archive bit associated with the file, otherwise refraining from resetting the archive bit.
2. The apparatus of claim 1 , wherein the processor is to execute a process to issue a command to transmit the persistent time stamp to the origin volume.
3. A system, comprising: a memory to store an origin volume; and
a plurality of processors to execute a snapshot process to take a snapshot of the origin volume in conjunction with a backup process and to record a persistent time stamp associated with the creation time of the snapshot, wherein the persistent time stamp is accessible to individual file system processes corresponding to the plurality of processors, and
wherein the plurality of processors is to execute a process to compare the persistent time stamp with a file modified time of a file on the origin volume as part of a file read operation, and when the file modified time is earlier than the persistent time stamp, to reset an archive bit associated with the file, otherwise refraining from resetting the archive bit.
4. The system of claim 3 , comprising:
a plurality of servers to house the plurality of processors.
5. The system of claim 3 , wherein the memory and the plurality of processors form a portion of a symmetric multiprocessing architecture.
6. A method, comprising:
in response to receiving a snapshot request by a snapshot service, taking a snapshot of an origin volume in conjunction with a backup process;
recording a persistent time stamp associated with the creation time of the snapshot, wherein the persistent time stamp is accessible to a file system process associated with the origin volume;
comparing a file modified time with the persistent time stamp, wherein the file modified time is associated with a file on the origin volume;
when the file modified time is earlier than the persistent time stamp, resetting an archive bit associated with the file; and
otherwise, refraining from resetting the archive bit.
7. The method of claim 6 , comprising:
sending the snapshot request from one of an administrative process, a backup application, and a virtualization service.
8. The method of claim 6 , wherein the comparing is prompted by a file read request or a second snapshot request.
9. The method of claim 6 ; comprising:
retrieving the file modified time using the file system process.
10. The method of claim 6 , wherein the resetting comprises:
resetting the archive bit using the file system process.
11. The method of claim 6 , comprising:
recording the snapshot to free space; and
creating a snapshot volume to store the snapshot.
12. The method of claim 6 , comprising:
executing comparing the file modified time with the persistent time stamp prior to reading the file.
13. The method of claim 6 , comprising:
writing a status of the archive bit and a meta-data modified time as part of meta-data associated with the file.
14. The method of claim 13 , comprising:
writing the meta-data modified time to be the same as the persistent time stamp if the meta-data modified time is earlier than the persistent time stamp.
15. The method of claim 6 , comprising:
sending a command to record the persistent time stamp on the origin volume.
16. The method of claim 15 , wherein the command is sent by one of an administrative process, a backup application, and a virtualization service.
17. The method of claim 6 , comprising:
executing a file read process to read a file on the origin volume;
if a meta-data modified time associated with the file is later than the persistent time stamp, returning meta-data associated with the file; and
otherwise, setting the meta-data modified time to be the same as the persistent time stamp, and returning the meta-data associated with the file.
18. A method, comprising:
creating a first snapshot of data stored on an origin volume as part of a backup process;
recording a first persistent time stamp associated with the creating of the first snapshot; and
adjusting the state of an archive bit associated with a file forming a portion of the origin volume based on a timing relationship between the first persistent time stamp and a modification time of the file,
wherein the adjusting the state of the archive bit further comprises:
comparing a file modified time with the persistent time stamp, wherein the file modified time is associated with a file on the origin volume;
when the file modified time is earlier than the persistent time stamp, resetting an archive bit associated with the file; and
otherwise, refraining from resetting the archive bit.
19. The method of claim 18 , comprising:
modifying a meta-data modified time associated with the file to be the same as the first persistent time stamp as part of meta-data associated with the file.
20. The method of claim 18 , comprising:
determining a meta-data modified time associated with the file by reading meta-data associated with the file;
if the meta-data modified time is later than the first persistent time stamp, returning the meta-data associated with the file; and
otherwise, setting the meta-data modified time to be the same as the first persistent time stamp, and returning meta-data associated with the file.
21. The method of claim 18 , wherein the recording comprises:
storing the first persistent time stamp on the origin volume.
22. The method of claim 18 , comprising:
creating a second snapshot of the data;
recording a second persistent time stamp associated with the creating of the second snapshot; and
adjusting a state of an archive bit associated with a second file forming a portion of the origin volume based on a timing relationship between the second persistent time stamp and a file modification time.
23. The method of claim 18 , comprising:
creating a second snapshot of the data, wherein the second snapshot includes the first persistent time stamp; and
adjusting the state of the archive bit associated with a file forming a portion of a snapshot volume based on a timing relationship between the first persistent time stamp and a file modification time.