[DRBD-user] Better performance with meta-data at the beginning of the device?

Lars Ellenberg Lars.Ellenberg at linbit.com
Wed Sep 13 16:03:20 CEST 2006

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


/ 2006-09-13 15:27:08 +0300
\ Cyril Bouthors:
> On 13 Sep 2006, Lars.Ellenberg at linbit.com wrote:
> 
> > please don't bother moving the internal meta data somewhere else. if
> > you want to control where the drbd meta data goes physically on
> > disk, use external meta data and put that partition of LV where you
> > want to have it.
> 
> Sounds good, I'll do that.
> 
> Any idea how much storing the meta-data at the beginning of my hard
> disk (i.e. inner tracks) will increase write perfs?
> 
> Any bench about that?

should not be too much, because we (drbd) go through a lot of trouble to
minimize access to that area anyways (tunable: al-extents).
and because, if we do, we typically write one sector worth of data,
so it is not normally the bandwidth, but the latency that is the
problem.  the "inner tracks" won't really decrease latency.

-- 
: Lars Ellenberg                                  Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH            Fax +43-1-8178292-82 :
: Schoenbrunner Str. 244, A-1120 Vienna/Europe   http://www.linbit.com :
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