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Adding a Second Log Shipping Secondary Instance

Posted on 2014-02-28
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Last Modified: 2014-02-28
Hi All,

I already log ship my main databases to another local server and now I need to also log ship to another physical DR location via a slower WAN connection.

My plan was to bring over the full backup of these databases ( which are quite large) and restore with standby in preparation to start log shipping to the DR site.

My question is this: how do I handle the incremental transaction log changes?  Normally when doing this for the first secondary instance I restore a full backup and then a current trans log backup before starting log shipping, I imagine doing that for a second instance will create an LSN problem for the existing log shipping instance?  Do I do a differential instead?

Thanks for the help.
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Question by:Primedius
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7 Comments
 
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Expert Comment

by:lcohan
ID: 39895003
I would think to use the Secondary log shipped database as source and set that one to Log ship to " another physical DR location via a slower WAN connection."
Not sure what the purpose is for the secondary database in your existing Log Shipping but I think by creating a chain rather than log ship from one single source would alleviate the problems may be caused on the primary source database.
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Author Comment

by:Primedius
ID: 39895067
Hmm, never thought of that. Is that something which is commonly done?  You can log ship from a database which is in standby as these will be?
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by:lcohan
ID: 39895234
I'll test right now the copy only backup on 2008 R2 Standby database.
Please see more details about different ways to "log ship" as highlighted in the picture/notes at the end of the article - I know is slightly different chain with Transactional Replication first but that one is just another Log Shipping method.

http://sqlmag.com/database-high-availability/3-log-shipping-techniques

Other options would be to use Transactional Replication with Pull Subscribers so the slow one will not affect the Publisher and the fast Subscriber which is not the StandBy Log Shipoped database(s).

Also check out the last solution just before last posting in this article and see if that helps.


http://www.sql-server-performance.com/forum/threads/backing-up-a-log-shipping-destination-database.17746/
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lcohan earned 500 total points
ID: 39895329
Actually I just set it all up in my 2008 R2 chained exactly as mentioned SQLDEV1 my OLTP database as Primary to Secondary in SQLDEV2 as standby and that one I used as Primary to log ship to SQLDEV3 Secondary in stand by mode as well.

I just wasn't 100% if what I did a while ago is still valid but yes, it is all good so far and working well to setup your stand by database as Primary to another T-log Shipping Secondary. I know I did this a while ago to offload the prod OLTP that was log shipped to a warm standby before clustering and from that to the reporting server which was in different data center from different location and with slower network connection.
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Author Comment

by:Primedius
ID: 39895347
Wow, thanks for the validation.  Will try this afternoon.
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Author Comment

by:Primedius
ID: 39896339
A little confused. On the secondary do I do a full backup and then a trans backup to restore on the third server to get the database in place to start log shipping.
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Author Comment

by:Primedius
ID: 39896407
No provision for backing up.  Hmm take offline and move files?
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