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comm vault backup chain

Posted on 2014-09-03
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Hi,

Is there a specific backup chain that comm vault uses?  To give a scenario...

This is for exchange

Sun: Full backup
Mon - Sat: Incremental

Sun: Partial full

The full is failing can't be ran again as it takes too long and log files are taking up the disk space.

If an incremental is then run on the Monday, does that have any impact?  

Is it usable?
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Question by:cmatchett
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SelfGovern earned 2000 total points
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You must have a full backup before an incremental can be used.
You must have every incremental in between that full backup and the incremental you want to restore to, in order to restore to your desired point.

Some suggestions and questions:
1) Why is the full backup failing?  What happens?  What error messages are in the CommVault logs?
2) Is this the only job that's failing?  Are there other jobs that are working?  How are they different?
3) While we talk about "full" backups, they don't have to be literally a backup of the full disks.  Can you make a logical partition of the data so that you can create "A" and "B" backups, each about half of the original size, and do a full backup of A on Day One, and an full backup of B on Day Two?   For instance, "A" might contain all your user files, and B might be the OS and Exchange database.
4) Saying you can't run the full again because it takes too long... well... how long is it going to take to restore your OS and applications, and for the users to recreate their data?  How long will your job last when the boss finds out that you didn't find a way to complete a backup because it "took too long"?  I'd suggest that if you have to split it up into ten or twenty backups... you need to get a complete backup of your most important data -- fast! -- and then you need to worry about the second-most critical data, and so on.  If you need to bring in a CommVault expert and pay her $2000 to get things working... well, better to bite that bullet and be done with it, than for the company to go out of business because it has no idea who owes it money, or what orders it was supposed to fill.

At least make sure you let the boss know what's going on, and what the risks to the company are.
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