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Migrating Distribution DB and the subscriber db to a different SAN.

Posted on 2011-03-20
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Last Modified: 2012-06-27
As part of SAN Migration we have planned to move the distribution db(different server)
and the subsciber db(different server)
to a different SAN. The  publisher is uneffected in this case.
Whats the best approach to perform this task without any downtime.
Just a FYI. Its an  transactional replication setup  with subscriber db  intitalized from backup.
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Question by:venk_r
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by:Raja Jegan R
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Since its a SAN migration, I hope you need to have some downtime to implement this change..
Since you are trying to do it without downtime in Publisher, you can try this approach.

1. Create a new publication in Source Server
2. Configure your distribution db and Subscriber for this new publication
3. Once everything is synchronized, remove the old publication..
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by:venk_r
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Thanks for the reply.The way we have initially configured subscription is Initialize from the backup and not thru snapshot.Due to this setting I guess we have to stop other services and application pointing to the publisher and then follow the steps that you have mentioned.But I dont want to have downtime on publisher.I thought we had log retention aound 72 hrs on the replication.Can we make use of it?
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by:Raja Jegan R
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>> The way we have initially configured subscription is Initialize from the backup and not thru snapshot
>> I thought we had log retention aound 72 hrs on the replication.Can we make use of it?

Kindly let me know your database sizes..
If it is less, then you can re-initialize from snapshot to get it done else go for Backup
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by:venk_r
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The database is 600G in size and there is  particlular table which has 2 billion records in it..
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by:Raja Jegan R
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Are you sure it is 600GB or 600MB.
If it is 600GB, then its recommended to go with Backup
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by:venk_r
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its 600GB.
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by:Raja Jegan R
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Then initialize with Backup instead of snapshot..
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by:venk_r
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Since its on the same servers .It just moving the database to a different drive I thought we can handle it without creating new set of publications.Wouldnt the TLogs catch up once we bring the distributor and subscriber online?
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Raja Jegan R earned 500 total points
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>> Since its on the same servers

This is what I have understood till now.

1. You have 600GB database replicated to another server
2. You are trying to move Distribution and Subscriber Server databases to a new SAN storage.

If I am correct, then you need to have some downtime to move your Subscriber Server databases (files) completely to the new SAN storage. Once done, you can bring Subscriber up which would automatically catch up.
This method doesn't require any downtime at the Publishing server.

Kindly confirm whether my understanding about your environment is correct or not.
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by:venk_r
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You got it right on.But how much time can the subscriber/distributor be left offline .Is there any limit?
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by:Raja Jegan R
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>> But how much time can the subscriber/distributor be left offline .Is there any limit?

Practically speaking there is no limit on that..
No. of transactions hit in the server when we have distributor & subscriber offline is directly proportional to the time taken to get subscriber synchronized...
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by:venk_r
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thanks
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