Back up to disk

[tech2004]

In disk staging, the data is written from disk to tape depending on what schedule you give it. If that data is erased from the disk, if you try to do a restore does it automatically try to restore from tape once it realizes the data isnt on disk anymore? Or does the restore fail? Would you have to restore from tape back to disk and then to the original location of the file that needs to be restored?

 

[djlaube]

Netbackup knows when the disk image is erased due to a successful duplication to tape, so to answer your question, yes, you will need to have the tape available in order to restore your file. As long as the tape is in the library then it will succeed. And no, it does not restore the file to disk then to original location- it goes directly from tape to original location..

 

[comtec17]

You will also need to change (depending on how configured via vault) the copy # of the tape. Since the backup to disk was done to disk first, it is Copy1 and the duplicated or staged is Copy2. NetBackup only restores from the primary copy, or copy1.

 

[Stumpr]

From the sys admin guide:
When the primary expires, a different copy automatically becomes primary. (The one chosen is the one with the smallest copy number. If the primary is copy 1, when it expires, copy 2 becomes primary. If the primary is copy 5, when it expires, copy 1 becomes primary.)

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Bob Stump
Just because the VERITAS documentation states a certain thing does not make it a fact and thats the truth