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# 1  
os block size

AIX 4.3.3

How can I find the os block size?

How can I change the OS Block Size?

When and where does the os block size get set?

I am running oracle 8.1.7 and am under the impression I need to set my os block size = oracle block size which is 8k.

Any insight on this would be helpful. Thanks.

$ df -I
Filesystem 512-blocks Used Free %Used Mounted on
# 2  
I answered part of your question on the other post for the same topic.

Here is a site that may help you tremendously. Look in chapter 4.
http://www.redbooks.ibm.com/SG245139/5139fm.htm

For most OSs, I believe I can say that 4mb is the default size for OS filesystems. To see your block size, you should be able to run a command on the volumes/slices. On HPUX it is something like "vgdisplay -v /dev/vg01/lvol". The information at the top will show it. Do a "man -k block" to find your command in your man pages.

You can set the blocksize when you create new filesystems. It can't be changed once you have created a volume/filesystem. You would have to backup the data and destroy and recreate the filesystem to change the block size.

You will have to create new filesystems to migrate data to or backup and recreate the ones you have.

Last edited by Kelam_Magnus; 10-10-2002 at 04:52 PM..

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