DLM

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DLM issues - Duplicated backup sets
Hi all, I have a complex issue with regards to DLM and duplicated backup sets I am hoping you may be able to help with. My current setup is as follows: We have two sites; Production and DR At each site we have a DataDomain setup as OST storage The production BE implementation is a CASO server and DR the slave. Each night we backup the production servers to the Production OST device and then duplicate to the DR OST device. The problem we are facing is that once a backup set has been duplicated to the DR OST device, both the production incrementals and DR incrementals become dependant on the last duplicated Full backup. The Full backups at the Production site display no dependant backup sets even though incrementals have since been taken. The issue with this is that when full backups expire on the Production OST they are removed regardless of there being any incremental backups still on the Production OST which would be dependant on the Full backup. Usualy DLM would recognise that there are dependent incrementals and expire but not delete. However as the dependent sets are being associated with the duplicated copy on the DR OST this does not happen. This means that in the event of a restore, I would have to rely on the DR OST backup sets which are not local to site, meaning a slow restore. I have a case raised with Veritas support who have replicated this issue in the lab and said this is "by design". I have asked them to tell me the logic behind this but whilst I wait, I was hoping I might get some insight here and also any particular workarounds (other then making my incrementals expire before my full set). Thanks in advance!
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Mike85
7 years ago Place Backup Exec
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Backup Set retention and expiry Handling on Removable (RDX etc) media
Backup Exec 2014, 15 and 16 handle removable media in a completely different way from the initial release of Backup Exec 2012 and BE 2010 R3 or earlier versions. This blog is an attempt to explain the operation and describe a scenario support have seen with removable media.
Colin_Weaver
8 years ago Place Enterprise Data Services Community Blog
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