[DRBD-user] 4TB limit [SOLVED]

Mikael Andersson mikael.andersson at rationellit.se
Wed May 25 17:22:18 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


> 
> On Wed, May 25, 2011 at 02:11:08PM +0200, Lionel Sausin wrote:
> > That's interresting. We use internal md indeed.
> > Lionel.
> >
> > Le 25/05/2011 14:04, Mikael Andersson a écrit :
> > > I do still have issues getting /dev/drbd1 device to come over 4TB
> > > limit (4293787648 byte) Now I think I have tested just about everything I
> can come up with, I found something I don't understand.
> > >
> > > When I configure "meta-disk internal" then I get what I want in size,
> about 9TB.
> > > But when I set "meta-disk /dev/sdb1[1]" I get the 4T limit.
> 
> Works as designed.
> 
> Maybe needs an additional sentence in bold in the man pages and User's
> Guide.
> 
> indexed external meta data is limited to 128 MiB:
> meta-disk  /dev/sde[3]; e.g. would live in megabytes 384 to 512 of sde.
> So it only has room for just below 4 TiB.
> 
> _flexible_ meta data is allowed to use up all available space of the meta data
> device.
> internal meta data is always flexible (with DRBD versions >= 8.x).
> iirc, that would look like
> flexible-meta-disk /dev/sde;
> 

Well, thanks for your time and answer Lars.
I didn't notice that in the documentation, now I know.

Thanks and Regards
Mikael Andersson



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