[DRBD-user] open source ha san

er krishna erkrishna at gmail.com
Tue Nov 17 04:45:01 CET 2009


Dear Philip,

Thanks a lot for reviewing and telling me about the errors. I will try to
modify  according to your suggestion and let you know after this.

Best Regards,
Krishna

On Mon, Nov 16, 2009 at 10:32 PM, Philipp Reisner <
philipp.reisner at linbit.com> wrote:

> Am Montag, 16. November 2009 17:11:00 schrieb er krishna:
> > Dear Lars,
> >
> > Please tell if you like the design and you are thinking to put it on your
> > site. I have some detail design other documents also which I want to put
> on
> > DRBD site.
> >
> > Best Regards,
> > Krishna
> >
>
>
> Hi Krishna,
>
> It is not only about the design, it is more about the content of your
> papers. There are a number of errors in the "ha_san_raid_lvm_aoe.pdf"
> document:
>
> *) Never put meta data on a loop device. It might deadlock under
>   memory pressure.
> *) No need to create the file system on top of DRBD twice. Once
>   on each node!!
> *) I got the impression you advise to mount an ext3 fs on the
>   secondary (ro). This has a severe cache coherency issue, and
>   should not be advised to anyone.
>
> The kernel patch simply drops all caches on the initiator side,
> which is rude in a way.
>
> Sorry, but I do not want to have this on .drbd.org as it is.
>
> -Phil
> --
> : Dipl-Ing Philipp Reisner
> : LINBIT | Your Way to High Availability
> : Tel: +43-1-8178292-50, Fax: +43-1-8178292-82
> : http://www.linbit.com
>
> DRBD(R) and LINBIT(R) are registered trademarks of LINBIT, Austria.
>
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