Databases
cancel
Showing results for 
Search instead for 
Did you mean: 

Physical extent size and informix raw space

SOLVED
Go to solution
Luke Morgan
Frequent Advisor

Physical extent size and informix raw space

Hi,

I am going to be adding a new volume group to an autoraid.
It will be used for chunks of raw space for an informix database.
I intend to add a new dbspace and use this volume group solely for that dbspace.

I have been advised to use 16mb physical extents when creating this VG.
All the other VGs on the system have 4mb physical extents.
Will the extent size have any effect on Informix?

Cheers
Luke
3 REPLIES
Sridhar Bhaskarla
Honored Contributor
Solution

Re: Physical extent size and informix raw space

Hi Luke,

No. It will not have any effect on the performance of informix. Extent based allocation allows the data to be arranged in an efficient way.

-Sri
You may be disappointed if you fail, but you are doomed if you don't try
Mark Greene_1
Honored Contributor

Re: Physical extent size and informix raw space

Using larger extents will allow you to create a larger volume group. Data still moves on and off the disks in whatever the controller's IO block size, which is independant of the extent size.

mark
the future will be a lot like now, only later
Luke Morgan
Frequent Advisor

Re: Physical extent size and informix raw space

Thank you both.

Luke