Re: [linux-lvm] questions

["Heinz J. Mauelshagen" <Mauelshagen@sistina.com>]

On Fri, Feb 09, 2001 at 09:34:05AM +0100, Christoph Hellwig wrote:
> On Thu, Feb 08, 2001 at 05:05:36PM -0700, Andreas Dilger wrote:
> > Change all of the code paths in the kernel that assume block size is 512
> > bytes...
> 
> IIRC some S/390 devices already use 4K block size.

Yes. They have so called DASD drives which are 4K hard sectored.

Anyway. if you change the BLOCK_SIZE definition in lvm.h from 1 to 4k
you can build LVs larger than 2TB (or even 4TB which is the default with the
1k block size used by LVM today).
You can't go beyond PAGE_SIZE though because a whole pile of code in
the kernel doesn't support that.
That means that you could even go to 8k block size on machines supporting
that page size.
Remember: you loose comapatibility with 4k page sized systems in this case.

> 
> 	Christoph
> 
> -- 
> Of course it doesn't work. We've performed a software upgrade.
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> linux-lvm mailing list
> linux-lvm@sistina.com
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-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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