Re: Howto tell kernel to use 4096 as granularity & minimum size?

[Linda Walsh]

Dave Chinner wrote:
> > I can partition the disk and setup the allocation size
> > to 4096, but I'd like to tell the kernel to use a
> > virtual-size of 4096 for the sector as an additional
> > performance 'hint', so nothing will even try to use
> > smaller i/o's than that.
> >     
>
> Just format the filesystem with 4k sector size.
---
   Good idea,  though.. I wanted to set it for the whole "disk"(array)
as it (multiple 4T drives) will be subdivided into multiple filesystems
and have lvm and a partition table under the file system(s),
so telling the kernel to only do 4K alloc+io's to the whole thing
would cover the most with the least.




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