Oracle DB extent based striping

Dear All,
We have Oracle 10g (ECC 6.0 - unicode) systems installed on HP UX. The usage of the sapdata folders are as follows:
/oracle/RD1/sapdata4        80%
/oracle/RD1/sapdata3        48%
/oracle/RD1/sapdata2        83%
/oracle/RD1/sapdata1        45%
Our data centre team (storage) is telling to migrate this database and implement "DB Extent based Striping" under only sapdata1 & sapdata2.
As per them, if we implement this and if any tablespace has got more than one data file (usally happens for SAP installation), Oracle will automatically allocate extents to all the data files simultaneously whenever it writes and that will ensure the equal utilization of storage space under all sapdata mount points.
I am very much unclear about this.
Any idea how to implement the same? Is there any documentation available?
Please advice.
Thanks & Regards
Sudip

Hi Sudip,
it's correct hat whenever a tablespace has more than one datafile Oracle will allocate extents in a round-robin fashion.
You get that for free - nothing to change here.
However, this will not equalize I/O traffic concerning the sapdataX-folders.
The idea to migrate to LMTS and ASSM is also quite a good one, but these are technologies that make storage easier to handle.
The storage is not going to be necessarily faster by that.
(Ok - LMTS brings performance enhancements during (de-)allocation of extents - but this is not the major concern here).
So for the goals of your storage people:
>01) Even usage of sapdata folders.
>02) Avoid I/O contention in one datafile (as per them, one extent will be automatically extended to all data files so to achieve read parallelization and increase database throughput.
I propose to move the datafiles so, that the I/O traffic is evenly distributed over the I/O Channels/LUNs ... whatever you have there...
This is done by just moving the files around.
Concerning the comment to 02... this is plain wrong. One extent will always just be stored into one datafile. Always.
BTW: Changing these things is usually quite time intensive and can rarely be done online. Have you got any measurements that actually indicate that your I/O troughput is bad due to I/O contention?
KR Lars

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