[DRBD-user] Antwort: Re: Hardware-recomendation needed

Robert.Koeppl at knapp.com Robert.Koeppl at knapp.com
Mon Apr 2 12:41:45 CEST 2012

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

The main downside of using a switch in your DRBD interlink is that you add 
another component that can - and at the worst possible time will - fail. 
If using a switched network use it with two network cards, two switches 
and Active/passive bonding. Otherwise you have the switch as single point 
of failure.
Mit freundlichen Grüßen / Best Regards

Robert Köppl

Customer Support & Projects 
Teamleader IT Support

KNAPP Systemintegration GmbH
Waltenbachstraße 9
8700 Leoben, Austria 
Phone: +43 3842 805-322
Fax: +43 3842 82930-500
robert.koeppl at knapp.com 

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Commercial register court: Leoben

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Felix Frank <ff at mpexnet.de> 
Gesendet von: drbd-user-bounces at lists.linbit.com
02.04.2012 12:36

Digimer <lists at alteeve.ca>
drbd-user at lists.linbit.com
Re: [DRBD-user] Hardware-recomendation needed

On 04/02/2012 10:09 AM, Digimer wrote:
> I'm open to being shown why I am wrong though (seriously :) ). Do you
> have any testing numbers or arguments against using a switch?

You got me. I've never made such analysis. It's more a case of "common
sense agrees with general recommendations agrees with general anxiety" ;-)

I'ts also that I'm fairly certain that if you do use a switched network
for you DRBD links, it is unlikely to be dedicated (because then it
would be almost trivial to remove the switch from this piece of your
setup). Again, I've been in situations where you cannot have a dedicated
link, and I sympathize, but it's a painful choice and I encourage
everyone to refrain from it.

I cannot comment on the sense (or lack thereof) in switching your
dedicated links. Your point appears valid.


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