Arcserve Backup supports library group spanning in a single step. This feature allows you to insert new blank media into a library group and continue the backup or restore. To insert new blank media into a library, use the Import/Export mail slots option (if your library supports this feature), and import the media using the Device Manager.
Alternatively, you can open the door of the library and insert the media manually. Although the Media Server does not automatically inventory the library when the library door is opened and then closed, it does inventory the slots in the library group in those special cases where you are prompted to insert media to complete the job. You can also erase media already in the library if you want your backup job to use one of the cartridges already present.
Important! If you are using multiple group access, be particularly careful when using media spanning. You can accidentally overwrite media unless you are sure that no additional jobs are submitted to the same group on a separate drive.
There are three common conditions associated with an open door condition when backing up or restoring in a single-step spanning environment. You may need to:
For all of these conditions, you are prompted to insert media by the job Status Monitor, the Job Status window, the logs, and the console to allow Arcserve Backup to complete the restore job. After the tape is inserted and mounted, the library inventories the tape and the job continues.
The following sections provide you with examples of single-step spanning that correspond directly to the three conditions described above.
Example: Adding Media to an Empty Slot in a Magazine
A backup job was scheduled to back up an entire machine to a library that holds a single magazine with four slots. Before the job was run, a magazine that contained two tapes was mounted into the library, causing an inventory of the slots in the magazine. All of the slots were assigned to GROUP0 to allow media spanning.
If Arcserve Backup required more than two tapes to complete the backup, you would be prompted to insert a tape into the library while the job was processing. If you know that one more tape would be enough to complete the backup, then you can open the library door and insert a tape into one of the two slots in the magazine that were empty when the magazine was first put into the library. The other two slots were home slots to the two inventoried tapes.
When the tape is put in and the door is closed, you perform a mount on that slot from the Device Manager. After the mount completes, the backup job resumes.
Here is another example of adding media, this time during a restore job. A restore job was scheduled to restore a directory to a machine from a library that holds a single magazine with four slots. Before the job was run, a magazine with two media in its slots was mounted into the library. This caused an inventory of the slots in the magazine. It was believed that two media contained the entire backed up directory. All of the slots were assigned to GROUP0 to allow media spanning.
If Arcserve Backup had originally required three media to complete the backup of the directory, a prompt appeared requiring the third media that Arcserve Backup had used to back up this directory. In this case, open the library door and insert the required media into one of the two slots in the magazine that was empty when the magazine was first put into the library. Close the library door, mount the tapes, and then the restore job continues.
Example: Adding a Magazine with Additional Media
A backup job was scheduled to back up a database server to a library that holds a single magazine with four slots. Before the job was run, a full magazine (four tapes in its slots) was mounted into the library, causing an inventory of the slots in the magazine. All of the slots were assigned to GROUP0 to allow tape spanning.
If Arcserve Backup requires more than four tapes to complete the backup, you would be prompted to insert a tape into the library while the job was processing. If you know that at least two more tapes will be required to complete the backup, you could open the library door, remove the magazine, replace all of the tapes inside the slots with new tapes, and then place the magazine back inside the library.
After the magazine is inserted and the door is closed, you perform a mount on the entire magazine from the Device Manager. After the mount completes, the backup job resumes.
Example: Swapping Full Media for New Media
A backup job was scheduled to back up an entire machine to a library that holds a single magazine with four slots. Since this library has more than one drive, a full magazine was mounted (four tapes in its slots) into the library before the job was run. This caused an inventory of the slots in the magazine.
If you are only supposed to use two tapes, you can assign the slots of two of the tapes to GROUP0 and the other two to GROUP1. Then you can run the backup using GROUP0.
However, since Arcserve Backup requires more than two tapes to complete the backup, you will be prompted to insert a tape into the library in the middle of the job. Open the library door and swap one of the tapes in GROUP0 with a new tape. Close the library door and mount the slot that contained the new tape so that Arcserve Backup recognizes the new tape. After the mount completes, the backup job resumes.
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