Gateway removal is indeed supported since ceph-iscsi 3.0 (or was it
2.7?) and it works while it is offline :)

Paul

-- 
Paul Emmerich

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On Tue, Dec 3, 2019 at 8:21 PM Jason Dillaman <jdill...@redhat.com> wrote:
>
> If I recall correctly, the recent ceph-iscsi release supports the
> removal of a gateway via the "gwcli". I think the Ceph dashboard can
> do that as well.
>
> On Tue, Dec 3, 2019 at 1:59 PM Wesley Dillingham <w...@wesdillingham.com> 
> wrote:
> >
> > We utilize 4 iSCSI gateways in a cluster and have noticed the following 
> > during patching cycles when we sequentially reboot single iSCSI-gateways:
> >
> > "gwcli" often hangs on the still-up iSCSI GWs but sometimes still functions 
> > and gives the message:
> >
> > "1 gateway is inaccessible - updates will be disabled"
> >
> > This got me thinking about what the course of action would be should an 
> > iSCSI gateway fail permanently or semi-permanently, say a hardware issue. 
> > What would be the best course of action to instruct the remaining iSCSI 
> > gateways that one of them is no longer available and that they should allow 
> > updates again and take ownership of the now-defunct-node's LUNS?
> >
> > I'm guessing pulling down the RADOS config object and rewriting it and 
> > re-put'ing it followed by a rbd-target-api restart might do the trick but 
> > am hoping there is a more "in-band" and less potentially devastating way to 
> > do this.
> >
> > Thanks for any insights.
> >
> > Respectfully,
> >
> > Wes Dillingham
> > w...@wesdillingham.com
> > LinkedIn
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>
>
>
> --
> Jason
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