[DRBD-user] One vs many DRBD resources

James R. Leu jleu at inoc.com
Mon Sep 26 15:23:47 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 Mon, Sep 26, 2011 at 09:00:41AM +0200, Maciej Gałkiewicz wrote:
> 2011/9/23 James R. Leu <jleu at inoc.com>:
> > We just went through this exercise and went with AOE instead
> > of iSCSI because we found the current crop of iSCSI target and
> > initiators to be lacking in terms selectively bringing a LUN 'up'
> > and 'down'.  Specifically the iSCSI target implementations do not
> > release the backstoring device when the LUN is marked as offline.
> > Thus preventing DRBD from going secondary.  (I posted a patch to the
> > tgtd mailing list to add the functionality, but it was rejected).
> > Do you plan on having the VM guests access the iSCSI server directly
> > or use iSCSI to connect the LUNs to the VM host and then the
> > host hands them to the guests as directly connected block devices?
> > We choose the latter to try and keep the guests as simple as possible.
> 
> I cannot use AOE because my servers are in different IP subnet. My VM
> contacts with iSCSI server directly. In my infrastructure DRBD is not
> on top of iSCSI.

With iSCSI on top of DRBD, DRBD will not allow you to go secondary
unless the iSCSI target releases the backend store.

> 
> -- 
> Regards
> Maciej Galkiewicz

-- 
James R. Leu
Software Architect
INOC
608.204.0203
608.663.4555 fax
jleu at inoc.com
www.inoc.com

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