Concerning oracle single block io call and os block size!!

Hi, all
The block size of my db(10gr2) is 8k, and
the db is on the raw device file system on a aix machine.
OS block size is 512k.
How much block will be read from disk when a single oracle io call occurs?
Which one is currect, 8K or 512K?
If the block size for a single io call depends on the os block size (512k),
I think os block size need to be tuned for oracle block size (8k).
If we use raw device file system, os level block size has no meaning??
Thanks in advance.
Best Regards.

Hi,
Please refer to the following oracle doc:
http://docs.oracle.com/cd/B28359_01/server.111/b32009/appa_aix.htm
extract from it:
Setting the Database Block Size
You can configure Oracle Database block size for better Input-Output throughput. On AIX, you can set the value of the DB_BLOCK_SIZE initialization parameter to between 2 KB and 32 KB, with a default of 4 KB. If Oracle Database is installed on a journaled file system, then the block size should be a multiple of the file system block size (4 KB on JFS, 16 K to 1 MB on GPFS). For databases on raw partitions, Oracle Database block size is a multiple of the operating system physical block size (512 bytes on AIX).
Thanks and Regards,
Raj K.

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