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Hello Eli,=0D=0A=0D=0AIf I replace "/usr/bin/vdsm-tool service-restart vd=
smd" with "echo b > /proc/sysrc-trigger", will the Engine consider the
no=
de to be fenced and restart the VMs that were running on it on another no=
de=3F I don't see a mechanism to inform the engine that this was a "hard"=
fencing operation and that it's save to restart the guests.=0D=0A=20=0D=0A=
Regards,=0D=0A=0D=0Amots=0D=0A=C2=A0=0D=0A-----Urspr=C3=BCngliche Nachric=
ht-----=0D=0A> Von:Eli Mesika <emesika(a)redhat.com <mailto:emesika@redhat.=
com> >=0D=0A> Gesendet: Son 16 November 2014 03:00=0D=0A> An: Patrick Lot=
tenbach <pl(a)a-bot.ch <mailto:pl@a-bot.ch> >=0D=0A> CC: users(a)ovirt.org
<m=
ailto:users@ovirt.org>=20=0D=0A> Betreff: Re: [ovirt-users] Fake power ma=
nagement=3F=0D=0A>=20=0D=0A>=20=0D=0A>=20=0D=0A> ----- Original Message -=
----=0D=0A> > From: "Sandro Bonazzola" <sbonazzo(a)redhat.com
<mailto:sbona=
zzo(a)redhat.com> >=0D=0A> > To: "mots" <mots(a)nepu.moe
<mailto:mots@nepu.mo=
e> >, users(a)ovirt.org <mailto:users@ovirt.org>=20=0D=0A> > Sent: Friday,
=
November 14, 2014 5:15:25 PM=0D=0A> > Subject: Re: [ovirt-users] Fake pow=
er management=3F=0D=0A> >=20=0D=0A> > Il 14/11/2014 15:54, mots ha scritt=
o:=0D=0A> > > Hello,=0D=0A> > >=20=0D=0A> > > I'm building
a small demons=
tration system for our sales team to take to a=0D=0A> > > customer so tha=
t they can show them our solutions.=0D=0A> > > Hardware: Two Intel NUC's,=
a 4 port switch and a laptop.=0D=0A> > > Engine: Runs as a VM on one of =
the NUCs, which one it runs on is determined=0D=0A> > > by pacemaker.=0D=0A=
> > Storage: Also managed by pacemaker, it's drbd backed
and accessed w=
ith=0D=0A> > > iscsi.=0D=0A> > > oVirt version:
3.5=0D=0A> > > OS: CentOS=
6.6=0D=0A> >=20=0D=0A> > Just for curiosity, any reason for using pacema=
ker instead on oVirt Hosted=0D=0A> > Engine solution=3F=0D=0A> >=20=0D=0A=
> >=20=0D=0A> > > The idea is to have our sales
representative (or the =
potential customer=0D=0A> > > himself) randomly
pull the plug on one of t=
he NUCs to show that the system=0D=0A> > > stays operational when part of=
the hardware fails.=0D=0A> > > My problem is that I don't have any way t=
o implement power management, so=0D=0A> > > the Engine can't fence nodes =
and won't restart guests that were running on=0D=0A> > > the node which l=
ost power. In pacemaker I can just configure fencing over=0D=0A> > > SSH =
or even disable the requirement to do so completely. Is there=0D=0A> > > =
something=0D=0A> > > similar for oVirt, so that the Engine will consider =
a node which it can't=0D=0A> > > connect to to be powered
down=3F=0D=0A>=20=
=0D=0A> Well, we are thinking of adding such ability (Fake power manageme=
nt) mainly for testing purpose...=0D=0A> Meanwhile, I think I have a work=
-around that may help you.=0D=0A>=20=0D=0A> When we have a connectivity i=
ssue with a node, we first try (after a grace period) to restart its VDSM=
via SSH=20=0D=0A> this is always done before the hard-fencing (restart v=
ia the PM card) and can be done no matter if the host has PM configured o=
r not.=0D=0A> So basically when a connectivity issue is found, you can cu=
stom the SSH command that restarts VDSM to do whatever you want, even a s=
cript or a power-down command=20=0D=0A>=20=0D=0A> look at the result of=20=
=0D=0A>=20=0D=0A> > psql -U engine -c "select * from vdc_options where o=
ption_name ilike 'SshSoftFencingCommand'" engine=0D=0A>=20=0D=0A>
optio=
n_id | option_name | option_value |=
version=0D=0A> -----------+-----------------------+---------------------=
---------------------+---------=0D=0A> 558 | SshSoftFencingCommand=
| service vdsmd restart | 3.0=0D=0A> 559 | Ssh=
SoftFencingCommand | service vdsmd restart | 3.1=0D=0A=
560 | SshSoftFencingCommand | service vdsmd restart
=
| 3.2=0D=0A> 561 | SshSoftFencingCommand | /usr/bin/vdsm-to=
ol service-restart vdsmd | 3.3=0D=0A> 562 | SshSoftFencingCommand =
| /usr/bin/vdsm-tool service-restart vdsmd | 3.4=0D=0A> 563 | SshS=
oftFencingCommand | /usr/bin/vdsm-tool service-restart vdsmd | 3.5=0D=0A>=
=20=0D=0A>=20=0D=0A> Please note:=0D=0A>=20=0D=0A> 1) change only the val=
ue that match your cluster version=0D=0A> 2) restart engine so change can=
take place=20=0D=0A> 3) restore to default value again after you are don=
e=20=0D=0A>=20=0D=0A> Does this may be useful for you =3F=0D=0A>=20=0D=0A=
=20=0D=0A>=20=0D=0A> > >=20=0D=0A> > >
Regards,=0D=0A> > >=20=0D=0A> > >=
mots=0D=0A> >
>=20=0D=0A> > >=20=0D=0A> > > ____________________________=
___________________=0D=0A> > > Users mailing list=0D=0A> > >
Users(a)ovirt.=
org <mailto:Users@ovirt.org>=20=0D=0A> > > http://lists.ovirt.org/mailman=
/listinfo/users <http://lists.ovirt.org/mailman/listinfo/users>=20=0D=0A>=
>=20=0D=0A> >=20=0D=0A> >=20=0D=0A> >
--=0D=0A> > Sandro Bonazzola=0D=0A=
> Better technology. Faster innovation. Powered by community collaborat=
ion.=0D=0A> > See how it works at redhat.com=0D=0A> >
___________________=
____________________________=0D=0A> > Users mailing list=0D=0A> > Users@o=
virt.org <mailto:Users@ovirt.org>=20=0D=0A> > http://lists.ovirt.org/mail=
man/listinfo/users <http://lists.ovirt.org/mailman/listinfo/users>=20=0D=0A=
>=20=0D=0A>=20=0D=0A=0D=0A
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://ww=
w.w3.org/TR/html4/loose.dtd"><html>=0A<head>=0A <meta
name=3D"Generator"=
content=3D"Zarafa WebApp v7.1.10-44973">=0A <meta
http-equiv=3D"Content=
-Type" content=3D"text/html; charset=3Dutf-8">=0A <title>AW:
[ovirt-user=
s] Fake power management=3F</title>=0A</head>=0A<body>=0A<pre
style=3D"wh=
ite-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wra=
p; white-space: pre-wrap; word-wrap: break-word;" wrap=3D"">Hello
Eli,<br=
<br>If I replace "/usr/bin/vdsm-tool service-restart
vdsmd" with "echo b=
> /proc/sysrc-trigger", will the Engine
consider the node to be fence=
d and restart the VMs that were running on it on another node=3F I don't =
see a mechanism to inform the engine that this was a "hard" fencing opera=
tion and that it's save to restart the guests.<br>
<br>Regards,<br><br>mo=
ts<br> <br>-----Urspr=C3=BCngliche Nachricht-----<br>>
Von:Eli Me=
sika <<a
href=3D"mailto:emesika@redhat.com">emesika@redhat.com</a>>=
<br>> Gesendet: Son 16 November 2014 03:00<br>> An: Patrick
Lottenb=
ach <<a
href=3D"mailto:pl@a-bot.ch">pl@a-bot.ch</a>><br>>
CC: <a=
href=3D"mailto:users@ovirt.org">users@ovirt.org</a><br>>
Betreff: Re:=
[ovirt-users] Fake power management=3F<br>> <br>>
<br>> <br>>=
; ----- Original Message -----<br>> > From: "Sandro
Bonazzola" <=
<a
href=3D"mailto:sbonazzo@redhat.com">sbonazzo@redhat.com</a>><br>>=
; > To: "mots" <<a
href=3D"mailto:mots@nepu.moe">mots@nepu.moe</a>&=
gt;, <a
href=3D"mailto:users@ovirt.org">users@ovirt.org</a><br>>
> =
Sent: Friday, November 14, 2014 5:15:25 PM<br>> > Subject: Re: [ovi=
rt-users] Fake power management=3F<br>> > <br>> >
Il 14/11/20=
14 15:54, mots ha scritto:<br>> > > Hello,<br>>
> > <br=
> > > I'm building a small demonstration
system for our sales t=
eam to take to a<br>> > >
customer so that they can show them ou=
r solutions.<br>> > > Hardware: Two Intel NUC's, a 4 port
switch=
and a laptop.<br>> > > Engine: Runs as a VM on one of the
NUCs,=
which one it runs on is determined<br>> > > by
pacemaker.<br>&g=
t; > > Storage: Also managed by pacemaker, it's drbd backed and acc=
essed with<br>> > > iscsi.<br>> > >
oVirt version: 3.5<=
br>> > > OS: CentOS 6.6<br>> >
<br>> > Just for curi=
osity, any reason for using pacemaker instead on oVirt Hosted<br>> >=
; Engine solution=3F<br>> > <br>> > >
<br>> > > T=
he idea is to have our sales representative (or the potential customer<br=
> > > himself) randomly pull the plug on one of
the NUCs to sho=
w that the system<br>> > > stays
operational when part of the ha=
rdware fails.<br>> > > My problem is that I don't have any
way t=
o implement power management, so<br>> > > the Engine can't
fence=
nodes and won't restart guests that were running on<br>> >
> th=
e node which lost power. In pacemaker I can just configure fencing over<b=
r>> > > SSH or even disable the requirement to do so completely.=
Is there<br>> > > something<br>> >
> similar for oVirt=
, so that the Engine will consider a node which it can't<br>> >
>=
; connect to to be powered down=3F<br>> <br>> Well, we are
thinking=
of adding such ability (Fake power management) mainly for testing purpos=
e...<br>> Meanwhile, I think I have a work-around that may help you.<b=
r>> <br>> When we have a connectivity issue with a node, we first
t=
ry (after a grace period) to restart its VDSM via SSH <br>> this is al=
ways done before the hard-fencing (restart via the PM card) and can be do=
ne no matter if the host has PM configured or not.<br>> So basically w=
hen a connectivity issue is found, you can custom the SSH command that re=
starts VDSM to do whatever you want, even a script or a power-down comman=
d <br>> <br>> look at the result of <br>>
<br>> > psql -U =
engine -c "select * from vdc_options where option_name ilike 'SshSoftFe=
ncingCommand'" engine<br>> <br>> option_id |
option_name =
| option_value | version<br>> -----------=
+-----------------------+------------------------------------------+-----=
----<br>> 558 | SshSoftFencingCommand | service vdsmd restart =
| 3.0<br>> 559 | SshSoftFencingCommand | serv=
ice vdsmd restart | 3.1<br>> 560 | SshSoftFe=
ncingCommand | service vdsmd restart | 3.2<br>> =
561 | SshSoftFencingCommand | /usr/bin/vdsm-tool service-restart vdsm=
d | 3.3<br>> 562 | SshSoftFencingCommand | /usr/bin/vdsm-tool s=
ervice-restart vdsmd | 3.4<br>> 563 | SshSoftFencingCommand | /=
usr/bin/vdsm-tool service-restart vdsmd | 3.5<br>> <br>>
<br>> P=
lease note:<br>> <br>> 1) change only the value that match your
clu=
ster version<br>> 2) restart engine so change can take place
<br>> =
3) restore to default value again after you are done <br>> <br>>
Do=
es this may be useful for you =3F<br>> <br>> <br>>
<br>> >=
> <br>> > > Regards,<br>> >
> <br>> > > mo=
ts<br>> > > <br>> > >
<br>> > > ______________=
_________________________________<br>> > > Users mailing
list<br=
> > > <a
href=3D"mailto:Users@ovirt.org">Users@ovirt.org</a><br=
> > > <a
href=3D"http://lists.ovirt.org/mailman/listinfo/users"=
target=3D"_blank">http://lists.ovirt.org/mailman/listinfo/us...
gt; > > <br>> > <br>> >
<br>> > --<br>> > S=
andro Bonazzola<br>> > Better technology. Faster innovation. Powere=
d by community collaboration.<br>> > See how it works at redhat.com=
<br>> >
_______________________________________________<br>> >=
; Users mailing list<br>> > <a
href=3D"mailto:Users@ovirt.org">User=
s(a)ovirt.org</a><br>&gt; > <a
href=3D"http://lists.ovirt.org/mailman/li=
stinfo/users"
target=3D"_blank">http://lists.ovirt.org/mailman/listinfo/u=
sers</a><br>> > <br>>
</pre>=0A</body>=0A</html>
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