Adding disk to existing disk group in ASM  on the windows 2003 server.

Guys,
Can someone please share some opinions of adding an extra disk to an existing disk group ( DG_FRA ) in ASM on a windows 2003 server ( like any issues when bringing db backup ). This is a production database and I want to be careful , so that I don't have any issues with the database. Existing DG_FRA is 550GB ( size of the image copy is 325GB ),recently we have been running heavy loads and this is filling up the archive logs and forcing us to take incremental backups couple of times before deleting the archive logs. As a result of this we decided to add an extra 200GB so that we don't have to do this backups frequently during the day. Storage is on EMC SAN and the database is in 11G.
Thanks for all your help.

There will not be any issues..
stamp the disk and then add the disk.
You can also follow this approach -
stamp the disk.
create a new group and then add a datafile in this new group for the existing tablespace.

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