[linux-lvm] questions
Heinz J. Mauelshagen
Mauelshagen at sistina.com
Fri Feb 9 11:21:55 UTC 2001
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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--
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 at Sistina.com +49 2626 141200
FAX 924446
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