CDR and DASH Copy

Last post 01-23-2013, 5:35 AM by adm-gosh. 2 replies.
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  • CDR and DASH Copy
    Posted: 01-19-2013, 9:18 AM

    Hi All

    Apologies in advance for what is mostly likely a simple answer.

    What is the difference/benefits (if any) between using CDR and DASH copies? To my inexperienced eyes they seem to both perform the same action. Am I understanding it correctly or have I missed something crucial?

    Currently we have multiple Aux/DASH copies sending data between our local 3 media agents and was wondering if we could benefit at all by introducing CDR into the mix.

    Thanks for taking the time to read.

  • Re: CDR and DASH Copy
    Posted: 01-21-2013, 9:53 PM

    CDR is a real time copy while aux copies (DASH copies) are done on a schedule. Also, CDR will make an exact replica of your disk. This means that if for some reason you had a corruption in a file on your source copy, it would get replicated to the destination copy. Aux copies will copy to another independant copy (tape or another disk library) so if you have a corruption on your source file, the aux copy will most likely fail or at the very least, shouldn't replicate the corruption over.

    I think about CDR more for a DR copy where you don't want to lose any data and keep a good RPO (like MS DFS-R if you're familiar with it) while aux copies are more suited to make secondary copies of your nightly backups.

    Hope this helps.


  • Re: CDR and DASH Copy
    Posted: 01-23-2013, 5:35 AM

    Cheers Phil

    Thinking something similiar but always helps to get another opinion.



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