Regarding migration

Hello Gurus
I want to migrate some of my databases to another server at one client.The client is asking for minimum downtime.
Like i have a database with 200GB.Now i have below options to migrate.
1)USE rman as downtime would be less.I need to take backup,restore to another server and then down prod,copy archives and apply to new location and make database up.
(this may not take more than 1 hour of downtime)
2)use expdp.downtime would be much but fragmentation in tablespace would be removed.If say i have a file with larger size then its actually using..could be re-organised.
(may take 10-15hrs of downtime)
So guys what are more advantages of using rman n expdp.
Whta you suggest for migration.is it necessary to remove fragmentation so performance would be good in future.
OS-AIX
oracle=10g
Regards

user11221081 wrote:
Hello Gurus
I want to migrate some of my databases to another server at one client.The client is asking for minimum downtime.
Like i have a database with 200GB.Now i have below options to migrate.
1)USE rman as downtime would be less.I need to take backup,restore to another server and then down prod,copy archives and apply to new location and make database up.
(this may not take more than 1 hour of downtime)
2)use expdp.downtime would be much but fragmentation in tablespace would be removed.If say i have a file with larger size then its actually using..could be re-organised.
(may take 10-15hrs of downtime)
So guys what are more advantages of using rman n expdp.
Whta you suggest for migration.is it necessary to remove fragmentation so performance would be good in future.
OS-AIX
oracle=10g
Regards
There are various ways you can do the migration and it depends upon the lot of factors.
1) About RMAN you mentioned, You can do the restore of the database on the other server( while your original database is up and running on old server) and start recovery(just do not open the database, keep your database in recovery mode and keep applying archive log). At the time of cutover just shutdown the old database apply last few archives on the new server. In this case your recovery time will be in few minutes instead of hours.
2) If you are using SAN, You can just move the LUNS to the new server if you are migrating to like servers. If you are little concern, just to the SAN copy at storage level and mount the copied LUN to the new server. This method will be faster than the methods you mentioned in your thread.
3) RMAN will not get rid of fragmentation. There are different ways to get rid of fragmentation. Google it.

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    Third, are there any concerns I should have, precautions I should take or procedures I need to do before, during or after the migration regarding the existing VMs and the new virtualized hardware environment on the same physical host?
    Forth, should I use the trial version of SCVMM 2012 SP1 (or another previous version) to perform the migration? What should I be aware of using SCVMM for the migration and then discontinuing its use after the migration is complete and moving to management
    using the RSAT?
    Fifth, if I don’t use SCVMM for the migration, what is the best procedure for moving the VMs? Should I just copy the VHDs to a temporary storage location, install Hyper-V server 2012, copy the VHDs back, create new VMs and attach the VHDs or should I use
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    1) As Jens said below with Windows Server 2012 you can simple copy the configuration files and VHDs from a 2008 R2 server to a 2012 server and import them - they one caveat to this is that any vlan configuration is lost and you have to simply re-create it. 
    Optionally you can also export the virtual machines from Windows Server 2008 R2 and then import them on Windows Server 2012.
    2) Remote management in a workgroup does have some caveat's associated with it - take a look at
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    4) That is an option - though you might find you like SCVMM
    5) Recreating VM's using existing VHD's has some issues for example the BIOS GUID changes, all of the NIC's are re-plug and played etc... When possible copying the configuration or using export is much better.
    6) The sooner the better - VHDx has a number of significant advantages, you can do the migration using the Hyper-V manager UI (edit disk) or via powershell with Convert-VHD.  Do keep in mind that during the conversation you need 2x the space (for the
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    7) In the past you could get into trouble if you for example snapshotted an AD virtual machine and than reverted it - taking one offline and then brining it back online was never a problem.  In Windows Server 2012 we addressed this with a feature called
    generation ID's.
    Domain considerations...  A few things to keep in mind regarding the choice to not domain join the Hyper-V server.
    - You can't live migrate virtual machines
    - You can't utilize Hyper-V over SMB
    - Management is more difficult and less secure
    -Taylor Brown -Program Manager, Hyper-V -http://blogs.msdn.com/taylorb

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