[DRBD-user] peer-max-bio-size 1M

Lars Ellenberg lars.ellenberg at linbit.com
Fri Apr 11 22:05:22 CEST 2014

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


On Fri, Apr 11, 2014 at 08:28:52PM +0200, Ben RUBSON wrote:
> > >> Will both nodes discuss about the value to use up to 1M, even if I don't
> > >> use "--peer-max-bio-size 1M" in drbdmeta ?
> > >
> > > If you have two nodes,
> > > don't use that option to drbdmeta.
> > 
> > But that doesn't answer the question - which IMHO is a really
> > important one, as lower values of queue/max_hw_sectors_kb can
> > dramatically reduce performance, especially when using fast SSDs.
> > And 128k _is_ a too low value for usage with contemporary SSDs.
> 
> From what I have understood, you can simply ignore this parameter,
> as both nodes once connected will discuss together about the best value
> to work with (up to 1M).
> 128k limitation is on manual drbdmeta input only.

That is correct.

> However, I may be wrong with my understanding :)

Nope, you are right.
Also I already admitted that this is an oversight (Bug),
and will be fixed anyways, even though it is mostly cosmetic imho.

Thanks,
	Lars

-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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