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  1. #1
    Join Date
    Jan 2003
    Location
    eugene, Oregon
    Posts
    15

    Unanswered: migrating cluster instances to stand alone install

    Hello all: looking for some general advice on proper approach. looking to move databases off of a clustered instance to a new (non-clustered) server.
    Got several issues i'd like some advice on.

    1. This is an OLTP instance that's been around for a while & it's pretty well encrusted with apps & processes that attach to it. Therefore it would be a very good thing if we didn't need to change the connection information in several hundred places after the move.
    I've tested one approach to this that seems to work: moved the instance to a server which has the same name as the cluster resource associated with the clustered instance and an instance that has the same name as the clustered instance.
    For example: cluster install is aiproddb\production, moved it to a box called aiproddb with a named instance called "production". There's a bunch of tedious network stuff that has to be done to make this work (binding an IP address to the MAC address of the new box and some murky DHCP reservation fiddling), but after the network crew got done cursing me it did finally work.
    Does this seem like a reasonable approach?

    2. What's the best way to transfer security info to the new instance? I used the transfer Logins DTS widget but had some problems with it not being able to find some groups in AD.

    3. what's the best way to transfer DTS packages?

    4. is it necessary for the new instance to be at the same patch level as the old instance? the old clustered instance is still at SP3 and i threw the latest SP4 on the new location. good/bad/indifferent?

    5. i was planning on taking a full backup & restoring it to the new machine. Is there a better way? Is the wizard for copying databases a good thing?

    Those are these issues i'm aware of and have given some thought to. There are probably things about this i haven't considered and would appreciate some word on.

    thanks,
    Garth

  2. #2
    Join Date
    Dec 2002
    Posts
    1,245
    Quote Originally Posted by garth
    5. [...] Is the wizard for copying databases a good thing?

    thanks,
    Garth
    NOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!!!!!!!!!





    hmscott
    Have you hugged your backup today?

  3. #3
    Join Date
    Jan 2003
    Location
    eugene, Oregon
    Posts
    15

    huggable backups

    ok. that's one vote against the copy database wizard...

  4. #4
    Join Date
    Dec 2002
    Posts
    1,245
    Quote Originally Posted by garth
    Hello all: looking for some general advice on proper approach. looking to move databases off of a clustered instance to a new (non-clustered) server.
    Got several issues i'd like some advice on.

    1. This is an OLTP instance that's been around for a while & it's pretty well encrusted with apps & processes that attach to it. Therefore it would be a very good thing if we didn't need to change the connection information in several hundred places after the move.
    I've tested one approach to this that seems to work: moved the instance to a server which has the same name as the cluster resource associated with the clustered instance and an instance that has the same name as the clustered instance.
    I know this does not help you now, but in the future, try adding a layer of virtualization in between by using a DNS zone specific to your apps. Then you can move physical servers in and out of production smoothly without impacting application connection strings. Use one DNS A record per database (e.g. MyDB.dev.apps, MySecondDB.dev.apps and MyDB.test.apps and MySecondDB.test.apps). The apps point to the DNS name, the DNS name translates to a physical IP. When it comes time to migrate a database (or an entire server) you have one place to go to update IP addresses (the DNS server).

    2. What's the best way to transfer security info to the new instance? I used the transfer Logins DTS widget but had some problems with it not being able to find some groups in AD.
    Try exporting the logins to a file, cull selected logins that you don't want/need (sa comes to mind) and then inserting them with proper syntax. Somewhere there is an MS article about using BCP to do this. If I recall correctly, use "bcp log shipping sgl server logins" for your google. I also did it by copying and pasting into an Excel spreadsheet and then using formulae to build the SQL syntax. Crude, but it worked.

    This will only build the logins and it will not link the users within the database to the logins (SID mismatch). For that you can use sp_change_users_login.

    3. what's the best way to transfer DTS packages?
    Depends on how much of your connection info is embedded. A while back I posted a script for backing up DTS packages to a structured file. If there aren't too many, this is a workable approach.

    By the way, is this an upgrade to SQL 2005, or a lateral to another SQL 2000 instance? If the former, you have more work cut out for you. If the latter, you should really consider the former (ie, you should be working on an upgrade).

    4. is it necessary for the new instance to be at the same patch level as the old instance? the old clustered instance is still at SP3 and i threw the latest SP4 on the new location. good/bad/indifferent?
    Should be all right. Watch the AWE memory thing with SP4, but I don't remember specific issues with SP4. Be careful if you are using replication.

    5. i was planning on taking a full backup & restoring it to the new machine. Is there a better way?
    sp_detach and sp_attach?

    The advantage with your method (if you have a large database) is that you can do a partial restore (which might take a long time) and then apply just the last log file to bring the new instance up to date to minimize your outage.

    Is the wizard for copying databases a good thing?
    Noooooooooooooooo!!!!!

    But enough on that subject .


    Those are these issues i'm aware of and have given some thought to. There are probably things about this i haven't considered and would appreciate some word on.

    thanks,
    Garth
    Test, test, test, practice, practice, practice.

    Good luck.

    Regards,

    hmscott
    Have you hugged your backup today?

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