Which is the best AU size?
Hi,
I want to create an Oracle cluster with ASM 11.2 and i want create 3 or 4 Diskgroup, one for DATA, one for RECO, one for REDO, one for CONFIG.
I've read somewhere that Oracle recommened a 4M AU Size
Is this the best for all Diskgroup or REDO may be 64M?
Oracle recommends that the AU size for a diskgroup be set to 4MB.
In addition to this AU size recommendation, the OS I/O size should be set to the largest possible size.
Some benefits of a 4 MB allocation unit (compared with 1MB) are:
Increased I/O through the I/O subsystem if the I/O size is increased to the AU size.
Reduced SGA size to manage the extent maps in the database instance.
Faster datafile initialization if the I/O size is increased to the AU size.
Increased file size limits.
Reduced database open time.
I have sure that use 64M of AU_SIZE to REDO is not a good idea. Because redo does small I/O operations.
The idea behind a large AU size is that you pay the overhead of positioning the disk drive head to a certain track and then you do sequential read of AU_SIZE of useful data that minimizes head seeks end maximizes sequential IO.
Most popular configuration that I have managed for DSS workload are 8MB and 16MB AU sizes.
For OLTP configurations I believe that 4MB is an optimal value.
In 12c the AU Size is key factor to get maxsize of storage(asmdisk).
https://docs.oracle.com/database/121/OSTMG/asmdiskgrps007.htm#OSTMG94136
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