block size

[Quang_2]

Hi,
In the kernel parameter, which one show blocks size when system is built?
Kind regards.

[Michael Tully · Accepted solution]

Are you referring to the block size of filesystems? There is no kernel parameter for this. Each filesystem can be done independently to each other from the newfs command:
Have a look at the man page for 'newfs_hfs' and 'newfs_vxfs'

To check a single logical volume e.g:

# fstyp -v /dev/vg00/rlvol7

look for f_blocks 512000 (512 block size)

[Steven E. Protter]

I don't think its a kernel parameter, though I might not be aware of that.

What I am aware of is when you set it.

This is done when making a filesystem.

man newfs

will give you the options you need to change the default, which as far as I know is an OS default.

Just in case your question has driven through one of my obvious holes in Sysadmin knowledge(there still are many), here are some candidates.

[1738]# kmtune | grep block
hfs_max_ra_blocks 8

Looks like I may be right this time.

SEP