1:10 a.m.
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30 jul 2012 kl. 17.18 skrev Itamar Heim:
On 07/30/2012 04:25 PM, Karli Sj=F6berg wrote:
30 jul 2012 kl. 12.26 skrev Itamar Heim:
On 07/30/2012 12:03 PM, Karli Sj=F6berg wrote:
30 jul 2012 kl. 11.01 skrev Itamar Heim:
On 07/30/2012 08:56 AM, Karli Sj=F6berg wrote:
28 jul 2012 kl. 14.11 skrev Moti Asayag:
On 07/26/2012 02:53 PM, Karli Sj=F6berg wrote:
Hi,
In my DC, I have three hosts added:
hostA
hostB
hostC
I want a way to force only to use hostA as a proxy for power
commands.
The algorithm of selection a host to act as a proxy for PM commands is
quite naive: any host from the system with status UP.
You can see how it is being selected in
FencingExecutor.FindVdsToFence()
from
ovirt-engine/backend/manager/modules/bll/src/main/java/org/ovirt/engine/cor=
e/bll/FencingExecutor.java
There is no other algorithm for the selection at the moment.
How would you handle a case in which hostA isn't responsive ? Wouldn't
you prefer trying to perform the fencing using other available host ?
Let me explain a little to make you better understand my reasoning
behind this configuration.
We work with segmented, separated networks. One network for public
access, one for storage traffic, one for management and so on. That
means that if the nodes themselves have to do their own
power-management, the nodes would require three interfaces each,
and the
metal we are using for hosts just don=B4t have that. But if we can
use the
engine to do that, the hosts would only require two interfaces, which
most 1U servers are equipped with as standard (plus one
iLO/IPMI/whatev), so we can use them as hosts without issue. Then the
backend has one extra interface that it can use to communicate over the
power management network to the respective service processor with.
Is there a "better" way to achieve what we are aiming for? Ideally, I
would like to set up the two NICs in a bond and create VLAN-interfaces
on top of that bond. That way, I can have as many virtual interfaces as
I want without having more than two physical NICs, but I haven=B4t been
able to find a good HOWTO explaining the process.
I think there is a difference between:
1. allowing engine to fence
2. allowing to choose fencing host per cluster (or per host)
it sounds like you actually want #1, but can live with #2, by installing
the engine as a host as well.
Exactly, I can live with #2, as I have the engine added as hostA in my DC
well, the question is if choosing another host to use for fencing
would/should be limited to hosts from same DC, then engine can only be
used to fence one DC.
I=B4m quoting you here:
"1. power management is DC wide, not cluster."
So this wouldn=B4t be any different from it=B4s current state.
true, but if you have multiple DCs, engine as a host can be used to
fence only one DC.
while if engine is 'special', it can be used to fence in all DCs
OK, so you actually want the engine to be special. Well, thats how VMWare v=
Center also manages power control so I like that as well. Of course it=B4s =
always better if engine could fence all DC=B4s, instead of just one, and it=
would also make it a lot more intuitive to configure, cause you won=B4t ne=
ed two hosts before the first could verify the other either. And if the en=
gine goes down, you would have bigger issues than power control to worry ab=
out;)
also, for any host other than engine, question is what to do if it is
down...
Med V=E4nliga H=E4lsningar
---------------------------------------------------------------------------=
----
Karli Sj=F6berg
Swedish University of Agricultural Sciences
Box 7079 (Visiting Address Kron=E5sv=E4gen 8)
S-750 07 Uppsala, Sweden
Phone: +46-(0)18-67 15 66
karli.sjoberg@slu.se<mailto:karli.sjoberg@slu.se> <mailto:karli.sjoberg@adm=
.slu.se>
Med V=E4nliga H=E4lsningar
---------------------------------------------------------------------------=
----
Karli Sj=F6berg
Swedish University of Agricultural Sciences
Box 7079 (Visiting Address Kron=E5sv=E4gen 8)
S-750 07 Uppsala, Sweden
Phone: +46-(0)18-67 15 66
karli.sjoberg@slu.se<mailto:karli.sjoberg@adm.slu.se>
--_000_A2F257DF259A4657B72BD4FD2F4DBD74sluse_
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"><br><div><div>30 jul 2012 =
kl. 17.18 skrev Itamar Heim:</div><br
class=3D"Apple-interchange-newline"><=
blockquote type=3D"cite"><div>On 07/30/2012 04:25 PM, Karli Sj=F6berg
wrote=
:<br><blockquote
type=3D"cite"><br></blockquote><blockquote
type=3D"cite">3=
0 jul 2012 kl. 12.26 skrev Itamar Heim:<br></blockquote><blockquote
type=3D=
"cite"><br></blockquote><blockquote
type=3D"cite"><blockquote type=3D"cite"=
On 07/30/2012 12:03 PM, Karli Sj=F6berg
wrote:<br></blockquote></blockquot=
e><blockquote
type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"c=
ite"><br></blockquote></blockquote></blockquote><blockquote
type=3D"cite"><=
blockquote type=3D"cite"><blockquote type=3D"cite">30 jul
2012 kl. 11.01 sk=
rev Itamar
Heim:<br></blockquote></blockquote></blockquote><blockquote
type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><br></blockqu=
ote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=3D=
"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">On 07/30/2012 08=
:56 AM, Karli Sj=F6berg
wrote:<br></blockquote></blockquote></blockquote></=
blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote =
type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><br></blo=
ckquote></blockquote></blockquote></blockquote></blockquote><blockquote
typ=
e=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote =
type=3D"cite"><blockquote type=3D"cite">28 jul 2012 kl. 14.11
skrev Moti As=
ayag:<br></blockquote></blockquote></blockquote></blockquote></blockquote><=
blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite=
"><blockquote type=3D"cite"><blockquote
type=3D"cite"><br></blockquote></bl=
ockquote></blockquote></blockquote></blockquote><blockquote
type=3D"cite"><=
blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite=
"><blockquote type=3D"cite"><blockquote
type=3D"cite">On 07/26/2012 02:53 P=
M, Karli Sj=F6berg
wrote:<br></blockquote></blockquote></blockquote></block=
quote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">Hi,<br></b=
lockquote></blockquote></blockquote></blockquote></blockquote></blockquote>=
</blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquot=
e type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockq=
uote type=3D"cite"><blockquote
type=3D"cite"><br></blockquote></blockquote>=
</blockquote></blockquote></blockquote></blockquote></blockquote><blockquot=
e type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockq=
uote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blo=
ckquote type=3D"cite">In my DC, I have three hosts
added:<br></blockquote><=
/blockquote></blockquote></blockquote></blockquote></blockquote></blockquot=
e><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"c=
ite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote
type=3D"cite"><br></blockquote></blockquote></blockqu=
ote></blockquote></blockquote></blockquote></blockquote><blockquote
type=3D=
"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite">hostA<br></blockquote></blockquote></blockquote></blockquote><=
/blockquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote=
type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockqu=
ote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">hostB=
<br></blockquote></blockquote></blockquote></blockquote></blockquote></bloc=
kquote></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><bl=
ockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite">=
<blockquote type=3D"cite"><blockquote
type=3D"cite">hostC<br></blockquote><=
/blockquote></blockquote></blockquote></blockquote></blockquote></blockquot=
e><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"c=
ite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote
type=3D"cite"><br></blockquote></blockquote></blockqu=
ote></blockquote></blockquote></blockquote></blockquote><blockquote
type=3D=
"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite">I want a way to force only to use hostA as a proxy for
power<b=
r></blockquote></blockquote></blockquote></blockquote></blockquote></blockq=
uote></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><bloc=
kquote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><b=
lockquote type=3D"cite"><blockquote
type=3D"cite">commands.<br></blockquote=
</blockquote></blockquote></blockquote></blockquote></blockquote></blockqu=
ote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D=
"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><br></blockquote></blockquote></blockquote></blockquote></blockqu=
ote></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><block=
quote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><bl=
ockquote type=3D"cite">The algorithm of selection a host to act as a proxy =
for PM commands
is<br></blockquote></blockquote></blockquote></blockquote><=
/blockquote></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite=
"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"c=
ite"><blockquote type=3D"cite">quite naive: any host from the
system with s=
tatus
UP.<br></blockquote></blockquote></blockquote></blockquote></blockquo=
te></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockq=
uote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blo=
ckquote
type=3D"cite"><br></blockquote></blockquote></blockquote></blockquo=
te></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=3D"=
cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite">You can see how it is
being selected in=
<br></blockquote></blockquote></blockquote></blockquote></blockquote></bloc=
kquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite">FencingExecutor.FindVdsToFence()<br></blockquote></blockquote>=
</blockquote></blockquote></blockquote></blockquote><blockquote
type=3D"cit=
e"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"=
cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">from<br></blockqu=
ote></blockquote></blockquote></blockquote></blockquote></blockquote><block=
quote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><bl=
ockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite">=
ovirt-engine/backend/manager/modules/bll/src/main/java/org/ovirt/engine/cor=
e/bll/FencingExecutor.java<br></blockquote></blockquote></blockquote></bloc=
kquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite"><blockquote
type=3D"cite"><br></blockquote></blockquote></bloc=
kquote></blockquote></blockquote></blockquote><blockquote
type=3D"cite"><bl=
ockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite">=
<blockquote type=3D"cite"><blockquote type=3D"cite">There
is no other algor=
ithm for the selection at the
moment.<br></blockquote></blockquote></blockq=
uote></blockquote></blockquote></blockquote><blockquote
type=3D"cite"><bloc=
kquote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><b=
lockquote type=3D"cite"><blockquote
type=3D"cite"><br></blockquote></blockq=
uote></blockquote></blockquote></blockquote></blockquote><blockquote
type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">How would =
you handle a case in which hostA isn't responsive ?
Wouldn't<br></blockquot=
e></blockquote></blockquote></blockquote></blockquote></blockquote><blockqu=
ote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><bloc=
kquote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">yo=
u prefer trying to perform the fencing using other available host ?<br></bl=
ockquote></blockquote></blockquote></blockquote></blockquote></blockquote><=
blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite=
"><blockquote type=3D"cite"><blockquote
type=3D"cite"><br></blockquote></bl=
ockquote></blockquote></blockquote></blockquote><blockquote
type=3D"cite"><=
blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite=
"><blockquote
type=3D"cite"><br></blockquote></blockquote></blockquote></bl=
ockquote></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><=
blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite=
">Let me explain a little to make you better understand my
reasoning<br></b=
lockquote></blockquote></blockquote></blockquote></blockquote><blockquote
t=
ype=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquot=
e type=3D"cite"><blockquote type=3D"cite">behind this
configuration.<br></b=
lockquote></blockquote></blockquote></blockquote></blockquote><blockquote
t=
ype=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquot=
e type=3D"cite"><blockquote
type=3D"cite"><br></blockquote></blockquote></b=
lockquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquot=
e type=3D"cite">We work with segmented, separated networks. One network for=
public<br></blockquote></blockquote></blockquote></blockquote></blockquote=
<blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"ci=
te"><blockquote type=3D"cite"><blockquote
type=3D"cite">access, one for sto=
rage traffic, one for management and so on.
That<br></blockquote></blockquo=
te></blockquote></blockquote></blockquote><blockquote
type=3D"cite"><blockq=
uote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blo=
ckquote type=3D"cite">means that if the nodes themselves have to do their o=
wn<br></blockquote></blockquote></blockquote></blockquote></blockquote><blo=
ckquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite"><=
blockquote type=3D"cite"><blockquote
type=3D"cite">power-management, the no=
des would require three interfaces
each,<br></blockquote></blockquote></blo=
ckquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote typ=
e=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote =
type=3D"cite">and
the<br></blockquote></blockquote></blockquote></blockquot=
e></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockqu=
ote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">metal=
we are using for hosts just don=B4t have that. But if we can<br></blockquo=
te></blockquote></blockquote></blockquote></blockquote><blockquote
type=3D"=
cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite">use
the<br></blockquote></blockquote></=
blockquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote =
type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquo=
te type=3D"cite">engine to do that, the hosts would only require two interf=
aces,
which<br></blockquote></blockquote></blockquote></blockquote></blockq=
uote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">most 1U serve=
rs are equipped with as standard (plus
one<br></blockquote></blockquote></b=
lockquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquot=
e type=3D"cite">iLO/IPMI/whatev), so we can use them as hosts without issue=
. Then
the<br></blockquote></blockquote></blockquote></blockquote></blockqu=
ote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D=
"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">backend has one =
extra interface that it can use to communicate over
the<br></blockquote></b=
lockquote></blockquote></blockquote></blockquote><blockquote
type=3D"cite">=
<blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cit=
e"><blockquote type=3D"cite">power management network to the
respective ser=
vice processor
with.<br></blockquote></blockquote></blockquote></blockquote=
</blockquote><blockquote
type=3D"cite"><blockquote type=3D"cite"><blockquo=
te type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite"><br></=
blockquote></blockquote></blockquote></blockquote></blockquote><blockquote
=
type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquo=
te type=3D"cite"><blockquote type=3D"cite">Is there a
"better" way to achie=
ve what we are aiming for? Ideally,
I<br></blockquote></blockquote></blockq=
uote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=
=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite">would like to set up the two NICs in a bond and create VLAN-in=
terfaces<br></blockquote></blockquote></blockquote></blockquote></blockquot=
e><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"c=
ite"><blockquote type=3D"cite"><blockquote
type=3D"cite">on top of that bon=
d. That way, I can have as many virtual interfaces
as<br></blockquote></blo=
ckquote></blockquote></blockquote></blockquote><blockquote
type=3D"cite"><b=
lockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite"=
<blockquote type=3D"cite">I want without having more
than two physical NIC=
s, but I haven=B4t
been<br></blockquote></blockquote></blockquote></blockqu=
ote></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><block=
quote type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">abl=
e to find a good HOWTO explaining the
process.<br></blockquote></blockquote=
</blockquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquo=
te
type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><block=
quote
type=3D"cite"><br></blockquote></blockquote></blockquote></blockquote=
</blockquote><blockquote
type=3D"cite"><blockquote type=3D"cite"><blockquo=
te type=3D"cite"><blockquote
type=3D"cite"><br></blockquote></blockquote></=
blockquote></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"=
<blockquote type=3D"cite"><blockquote
type=3D"cite">I think there is a dif=
ference
between:<br></blockquote></blockquote></blockquote></blockquote><bl=
ockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite">=
<blockquote type=3D"cite">1. allowing engine to
fence<br></blockquote></blo=
ckquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquote typ=
e=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">2. allowing =
to choose fencing host per cluster (or per
host)<br></blockquote></blockquo=
te></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=3D"=
cite"><blockquote type=3D"cite"><blockquote
type=3D"cite"><br></blockquote>=
</blockquote></blockquote></blockquote><blockquote
type=3D"cite"><blockquot=
e type=3D"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">it soun=
ds like you actually want #1, but can live with #2, by installing<br></bloc=
kquote></blockquote></blockquote></blockquote><blockquote
type=3D"cite"><bl=
ockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote type=3D"cite">=
the engine as a host as
well.<br></blockquote></blockquote></blockquote></b=
lockquote><blockquote type=3D"cite"><blockquote
type=3D"cite"><blockquote t=
ype=3D"cite"><br></blockquote></blockquote></blockquote><blockquote
type=3D=
"cite"><blockquote type=3D"cite"><blockquote
type=3D"cite">Exactly, I can l=
ive with #2, as I have the engine added as hostA in my
DC<br></blockquote><=
/blockquote></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite=
"><br></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=
=3D"cite">well, the question is if choosing another host to use for fencing=
<br></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=3D=
"cite">would/should be limited to hosts from same DC, then engine can only =
be<br></blockquote></blockquote><blockquote
type=3D"cite"><blockquote type=
=3D"cite">used to fence one
DC.<br></blockquote></blockquote><blockquote ty=
pe=3D"cite"><br></blockquote><blockquote
type=3D"cite">I=B4m quoting you he=
re:<br></blockquote><blockquote type=3D"cite">"1. power
management is DC wi=
de, not cluster."<br></blockquote><blockquote
type=3D"cite"><br></blockquot=
e><blockquote type=3D"cite">So this wouldn=B4t be any different from
it=B4s=
current state.<br></blockquote><br>true, but if you have multiple DCs,
eng=
ine as a host can be used to <br>fence only one DC.<br>while if engine is
'=
special', it can be used to fence in all
DCs<br></div></blockquote><div><br=
</div>OK, so you actually want the engine to be special. Well,
thats how V=
MWare vCenter also manages power control so I like that as well. Of
course =
it=B4s always better if engine could fence all DC=B4s, instead of just one,=
and it would also make it a lot more intuitive to configure, cause you won=
=B4t need two hosts before the first could verify the other either. A=
nd if the engine goes down, you would have bigger issues than power control=
to worry about;)</div><div><br></div><div><blockquote
type=3D"cite"><div><=
br><blockquote
type=3D"cite"><br></blockquote><blockquote
type=3D"cite"><br=
</blockquote><blockquote
type=3D"cite"><blockquote type=3D"cite">also, for=
any
host other than engine, question is what to do if it is<br></blockquot=
e></blockquote><blockquote type=3D"cite"><blockquote
type=3D"cite">down...<=
br></blockquote></blockquote><blockquote
type=3D"cite"><br></blockquote><bl=
ockquote type=3D"cite"><br></blockquote><blockquote
type=3D"cite"><br></blo=
ckquote><blockquote type=3D"cite">Med V=E4nliga
H=E4lsningar<br></blockquot=
e><blockquote
type=3D"cite">-----------------------------------------------=
--------------------------------<br></blockquote><blockquote
type=3D"cite">=
Karli Sj=F6berg<br></blockquote><blockquote
type=3D"cite">Swedish Universit=
y of Agricultural Sciences<br></blockquote><blockquote
type=3D"cite">Box 70=
79 (Visiting Address Kron=E5sv=E4gen 8)<br></blockquote><blockquote
type=3D=
"cite">S-750 07 Uppsala, Sweden<br></blockquote><blockquote
type=3D"cite">P=
hone: +46-(0)18-67 15 66<br></blockquote><blockquote
type=3D"cite"><a=
href=3D"mailto:karli.sjoberg@slu.se">karli.sjoberg@slu.se</a>
<<a href=
=3D"mailto:karli.sjoberg@adm.slu.se">mailto:karli.sjoberg@adm.slu.se</a>>=
;<br></blockquote><blockquote
type=3D"cite"><br></blockquote><br><br></div>=
</blockquote></div><br><div>
<span class=3D"Apple-style-span" style=3D"border-collapse: separate;
color:=
rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: no=
rmal; font-weight: normal; letter-spacing: normal; line-height: normal; orp=
hans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; =
white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizonta=
l-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorati=
ons-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-wi=
dth: 0px; font-size: medium; "><div><br
class=3D"Apple-interchange-newline"=
<br></div><div>Med V=E4nliga
H=E4lsningar<br>-----------------------------=
--------------------------------------------------<br>Karli
Sj=F6berg<br>Sw=
edish University of Agricultural Sciences<br>Box 7079 (Visiting Address Kro=
n=E5sv=E4gen 8)<br>S-750 07 Uppsala, Sweden<br>Phone: +46-(0)18-67
15=
66</div><div><a
href=3D"mailto:karli.sjoberg@adm.slu.se">karli.sjoberg@slu=
.se</a></div></span>
</div>
<br></body></html>=
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