[DRBD-user] Sensible maximum number of drbd devices

Luciano Miguel Ferreira Rocha strange at nsk.no-ip.org
Wed Apr 5 22:09:23 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.

On Wed, Apr 05, 2006 at 09:29:16PM +0200, Michael Paesold wrote:
> Luciano Miguel Ferreira Rocha wrote:
> >Another option to consider is iSCSI. It would at least allow you to
> >decouple drbd and xen.
> That's an option I thought about, too. Would you use iSCSI on a dedicated 
> server? Or can iSCSI server and client be on the same host? Otherwise that 
> would add much higher infrastructure costs. We are trying to build really 
> low cost clusters (from a hardware perspective at least).
> Unfortunately, iSCSI introduces even another overhead -- SCSI is not really 
> a light-weight protocol. Another option would be gnbd, but that requires a 
> dedicated "SAN" server cluster, again.

There's nothing stopping you from providing the server on the same
host. (Besides performance concerns, of course. If iSCSI's overhead is
significant (I personally don't know, I haven't done any tests yet),
then go with gnbd, or nbd. They don't need the server to be separated
from the client.

I don't know many services that have that requirement.

Anyway, the domU instances would be remote clients, for all intents and


More information about the drbd-user mailing list