Best Practices To Size the Datafile on ASM in Oracle 11gR2

Hi DBAs,
I need to know that what should be the datafile next extent on ASM. I have created a database 11gR2 with ASM. Now some certified DBA told me to create the datafile as small as possible and make it auto extend with the next extent size 1M. The expected data growth every month is about 20-25 Gig.
Please let me know what are the best practices while for sizing the datafiles and extents in 11g using ASM. Any good document/note refer would be great help.
Thanks
-Samar-

Hi Samar,
I need to know that what should be the datafile next extent on ASM. I have created a database 11gR2 with ASM. >Now some certified DBA told me to create the datafile as small as possible and make it auto extend with the next >extent size 1M. The expected data growth every month is about 20-25 Gig.
Please let me know what are the best practices while for sizing the datafiles and extents in 11g using ASM. Any >good document/note refer would be great help.I don't think there is any kind of recomendations for that, at least, I've never seen. As You probably know, ASM already divides the ASM files (any sort of files written in a ASM diskgroup) in extents and those extents are composed of AU. So, doesn't matter the datafile size, ASM will balace the I/O on all ASM disks in a diskgroup.
I guess this thread ( AU_SIZE and Variable Extent Size ), even not being the subject of Your question, Will help You.
I do believe there are more important factors for ASM performance, like stripe size, LUN size, storage configuration, etc.
Hope it helps,
Cerreia

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