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Hi Gianluca,=20
My answers below,=20
cordialement, regards,=20
=09Nelson LAMEIRAS=20
Ing=C3=A9nieur Syst=C3=A8mes et R=C3=A9seaux / Systems and Networks enginee=
r=20
Tel: +33 5 32 09 09 70=20
nelson.lameiras(a)lyra-network.com=20
www.lyra-network.com | www.payzen.eu=20
=09
=09
=09
Lyra Network, 109 rue de l'innovation, 31670 Lab=C3=A8ge, FRANCE=20
From: "Gianluca Cecchi" <gianluca.cecchi(a)gmail.com>=20
To: "Nelson Lameiras" <nelson.lameiras(a)lyra-network.com>=20
Cc: "ovirt users" <users(a)ovirt.org>=20
Sent: Thursday, June 8, 2017 9:36:33 AM=20
Subject: Re: [ovirt-users] ISCSI storage with multiple nics on same subnet =
disabled on host activation=20
On Wed, Jun 7, 2017 at 2:59 PM, Nelson Lameiras < nelson.lameiras@lyra-netw=
ork.com > wrote:=20
BQ_BEGIN
Hello,=20
In our oVirt hosts, we are using DELL equallogic SAN with each server conne=
cting to SAN via 2 physical interfaces. Since both interfaces share the sam=
e network (Equalogic limitation) we must patch the linux kernel to to allow=
iSCSI multipath with multiple NICs in the same subnet with sysctl :=20
---------------------------------------------------------------------------=
-----------------=20
net.ipv4.conf.p2p1.arp_ignore=3D1
net.ipv4.conf.p2p1.arp_announce=3D2
net.ipv4.conf.p2p1.rp_filter=3D2
net.ipv4.conf.p2p2.arp_ignore=3D1
net.ipv4.conf.p2p2.arp_announce=3D2
net.ipv4.conf.p2p2.rp_filter=3D2=20
BQ_END
BQ_BEGIN
Hello Nelson,=20
nice to see another environment based on EQL iSCSI SAN.=20
The systctl.conf customized lines above are not what you mean with "we must=
patch the linux kernel", is it?=20
What do you mean exactly?=20
BQ_END
Sorry, by "patch" I meant "sysctl.conf configuration" indeed.=20
This configuration is what we use to be able to configure 2 network interfa=
ces in the same subnet.=20
BQ_BEGIN
---------------------------------------------------------------------------=
-----------------=20
BQ_END
BQ_BEGIN
This works great in most setups, but for a strange reason, on some of our s=
etups, the sysctl configuration is updated by VDSM when activating a host a=
nd the second interface stops working immeadiatly :=20
---------------------------------------------------------------------------=
-----------------=20
vdsm.log=20
2017-06-07 11:51:51,063+0200 INFO (jsonrpc/5) [storage.ISCSI] Setting stri=
ct mode rp_filter for device 'p2p2'. (iscsi:602)
2017-06-07 11:51:51,064+0200 ERROR (jsonrpc/5) [storage.HSM] Could not conn=
ect to storageServer (hsm:2392)
Traceback (most recent call last):
File "/usr/share/vdsm/storage/hsm.py", line 2389, in connectStorageServer
conObj.connect()
File "/usr/share/vdsm/storage/storageServer.py", line 433, in connect
iscsi.addIscsiNode(self._iface, self._target, self._cred)
File "/usr/lib/python2.7/site-packages/vdsm/storage/iscsi.py", line 232, =
in addIscsiNode
iscsiadm.node_login( iface.name , target.address, target.iqn)
File "/usr/lib/python2.7/site-packages/vdsm/storage/iscsiadm.py", line 33=
7, in node_login
raise IscsiNodeError(rc, out, err)=20
In my environment I don't see these kinds of problems.=20
I'm using plain CentOS 7.3 hosts as hypervisors; is this your case too or a=
re you using ovirt-ng nodes?=20
BQ_END
Plain CentOS 7.3 hosts also. Built from a Minimal centos and adding oVirt r=
epositories.=20
BQ_BEGIN
---------------------------------------------------------------------------=
-----------------=20
"strict mode" is enforced for second interface, and it no longuer works...=
=20
Which means - at least - that there is no redundancy in case of hardware fa=
illure and this is not acceptable for our production needs.=20
What is really strange is that we have another "twin" site on another geogr=
aphic region with simillar hardware configuration and same oVirt installati=
on, and this problem does not happen.=20
What can be the root cause of this behaviour? How can I correct it?=20
BQ_END
BQ_BEGIN
Actually it is very strange to me to understand how you don't have problems=
on the other side.=20
My workaround to get multipath with EQL in oVirt was the one explained here=
with screenshots:=20
http://lists.ovirt.org/pipermail/users/2017-March/080992.html=20
It has been working now for about 3 months without problems. We have severa=
l Oracle RDBMS server VMs on it, from 2virtual threads and 8Gb of ram to 16=
threads (2-4-2) and 64Gb of ram=20
How did you configure multipath instead? As far as I know oVirt will not le=
t you do it.=20
The only way would be to use bonding but that is not certified/supported by=
Dell.=20
HIH sharing experiences,=20
Gianluca=20
BQ_END
I've read the link you gave and it seems to me that you are using the same =
physical interface for SAN and vm network.=20
In my setup :=20
- SAN network is using two disctinct physical interfaces (p2pX) on same sub=
net (therefore the need for sysctl patch)=20
- VM network (p1pX) is using 2 other distinct physical interfaces on "trunk=
" mode=20
- Administration network (emX) is using 2 distinct bonded network interface=
s=20
Our setup, using a total of 6 network interfaces is "simpler" than yours si=
nce each interface has a "disctinct" role.=20
To make multipath work with oVirt on this setup, we had to configure SAN ne=
twork on system before installing oVirt (using sysctl.conf above),=20
- next declare 2 SAN networks on oVirt that are "dragued" to each SAN inter=
face in host network configuration,=20
- and finally, in datacenter listing, chosing a datacenter and selecting "i=
SCSI Multipathing" tab below I can add a multipath configuration concerning=
both SAN oVirt networks and relevant iqn storage targets.=20
Hope it's clear, if not, please ask me.=20
It's very strange to me also since this configuration did work great on our=
labs. But half of production sites have the problem decribed above : secon=
d SAN interface stops working uppon host activation because vdsm forces sys=
ctl net.ipv4.conf.p2p2.rp_filter to 1 (strict mode).=20
Still searching for clues as why this behaviour...=20
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<html><body><div style=3D"font-family: arial, helvetica, sans-serif;
font-s=
ize: 12pt; color: #000000"><div>Hi
Gianluca,<br></div><div><br data-mce-bog=
us=3D"1"></div><div>My answers below,<br
data-mce-bogus=3D"1"></div><div><b=
r></div><div data-marker=3D"__SIG_PRE__"><div>cordialement,
regards,</div><=
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x; font-family: Arial,sans-serif; color: #2b3c7a; line-height: 16px; width:=
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Arial,sans-serif; color: #2b3c7a; line-height: 18px; font-weight: bold;" da=
ta-mce-style=3D"font-size: 16px; font-family: Arial,sans-serif; color: #2b3=
c7a; line-height: 18px; font-weight: bold;">Nelson
LAMEIRAS</td></tr><tr><t=
d style=3D"font-family: Arial,sans-serif; color: #2b3c7a; font-size: 11px; =
line-height: 16px;" data-mce-style=3D"font-family: Arial,sans-serif; color:=
#2b3c7a; font-size: 11px; line-height: 16px;">Ing=C3=A9nieur Syst=C3=A8mes=
et R=C3=A9seaux<span style=3D"font-family: Arial,sans-serif; color: #337ab=
7; font-size: 11px;" data-mce-style=3D"font-family: Arial,sans-serif; color=
: #337ab7; font-size: 11px;"> / Systems and Networks
engineer</span></td></=
tr><tr><td style=3D"line-height: 16px; font-family:
'Arial',sans-serif; col=
or: #2b3c7a; font-size: 11px;" data-mce-style=3D"line-height: 16px; font-fa=
mily: 'Arial',sans-serif; color: #2b3c7a; font-size: 11px;"><span
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tyle=3D"font-family: Arial,sans-serif; color: #2b3c7a; font-size: 11px;">Te=
l: +33 5 32 09 09 70</span></td></tr><tr><td
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t-size: 11px; font-family: Arial,sans-serif; color: #2b3c7a; line-height: 1=
6px; width: 30.75pt; text-align: left;"><div>Lyra Network, 109 rue de
l'inn=
ovation, 31670 Lab=C3=A8ge,
FRANCE</div></td></tr></tbody></table><div><br>=
</div></div><div><br></div><hr id=3D"zwchr"
data-marker=3D"__DIVIDER__"><di=
v data-marker=3D"__HEADERS__"><b>From: </b>"Gianluca
Cecchi" <gianluca.c=
ecchi(a)gmail.com&gt;<br><b>To: </b>"Nelson Lameiras"
<nelson.lameiras@lyr=
a-network.com><br><b>Cc: </b>"ovirt users"
&lt;users(a)ovirt.org&gt;<br><b=
Sent: </b>Thursday, June 8, 2017 9:36:33
AM<br><b>Subject: </b>Re: [ovirt-=
users] ISCSI storage with
multiple nics on same subnet disabled on host act=
ivation<br></div><div><br></div><div
data-marker=3D"__QUOTED_TEXT__"><div d=
ir=3D"ltr"><div class=3D"gmail_extra"><div
class=3D"gmail_quote"><blockquot=
e>On Wed, Jun 7, 2017 at 2:59 PM, Nelson Lameiras <span
dir=3D"ltr"><<a =
href=3D"mailto:nelson.lameiras@lyra-network.com"
target=3D"_blank">nelson.l=
ameiras(a)lyra-network.com</a>&gt;</span>
wrote:</blockquote><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid
r=
gb(204,204,204);padding-left:1ex"><div><div
style=3D"font-family:arial,helv=
etica,sans-serif;font-size:12pt;color:rgb(0,0,0)"><div>Hello,<br></div><br>=
<div>In our oVirt hosts, we are using DELL equallogic SAN with each server =
connecting to SAN via 2 physical interfaces. Since both interfaces share th=
e same network (Equalogic limitation) we must patch the linux kernel to to =
allow iSCSI multipath with multiple NICs in the same subnet with sysctl :<b=
r></div><br><div>----------------------------------------------------------=
----------------------------------<br></div><div><pre>net.ipv4.conf.p2p1.ar=
p_ignore=3D1
net.ipv4.conf.p2p1.arp_announce=3D2
net.ipv4.conf.p2p1.rp_filter=3D2
net.ipv4.conf.p2p2.arp_ignore=3D1
net.ipv4.conf.p2p2.arp_announce=3D2
net.ipv4.conf.p2p2.rp_filter=3D2<br><br></pre></div></div></div></blockquot=
e><blockquote><div>Hello Nelson,</div><div>nice to see another
environment =
based on EQL iSCSI SAN.</div><div>The systctl.conf customized lines above a=
re not what you mean with "we must patch the linux kernel", is
it?</div><di=
v>What do you mean exactly?</div></blockquote></div><div
class=3D"gmail_quo=
te"><br data-mce-bogus=3D"1"></div><div
class=3D"gmail_quote">Sorry, by "pa=
tch" I meant "sysctl.conf configuration" indeed.
<br></div><div class=3D"gm=
ail_quote">This configuration is what we use to be able to configure 2 netw=
ork interfaces in the same
subnet.<br><div> <br></div><div><div style=
=3D"font-family:arial,helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"=
<div><blockquote><p>------------------------------------------------------=
--------------------------------------<br><br></p></blockquote></div></div>=
</div><blockquote><div><div
style=3D"font-family:arial,helvetica,sans-serif=
;font-size:12pt;color:rgb(0,0,0)"><div><p>This works great in most
setups, =
but for a strange reason, on some of our setups, the sysctl configuration i=
s updated by VDSM when activating a host and the second interface stops wor=
king immeadiatly :</p><div>------------------------------------------------=
--------------------------------------------</div><div>vdsm.log<br></div><d=
iv><pre
id=3D"gmail-m_3172160333806361248preview"><code>2017-06-07 11:51:51=
,063+0200 INFO (jsonrpc/5) [storage.ISCSI] Setting strict mode rp_filter f=
or device 'p2p2'. (iscsi:602)
2017-06-07 11:51:51,064+0200 ERROR (jsonrpc/5) [storage.HSM] Could not conn=
ect to storageServer (hsm:2392)
Traceback (most recent call last):
File "/usr/share/vdsm/storage/hsm.py", line 2389, in connectStorageServer
conObj.connect()
File "/usr/share/vdsm/storage/storageServer.py", line 433, in connect
iscsi.addIscsiNode(self._iface, self._target, self._cred)
File "/usr/lib/python2.7/site-packages/vdsm/storage/iscsi.py", line 232, =
in addIscsiNode
iscsiadm.node_login(<a href=3D"http://iface.name"
target=3D"_blank">ifa=
ce.name</a>, target.address, target.iqn)
File "/usr/lib/python2.7/site-packages/vdsm/storage/iscsiadm.py", line 33=
7, in node_login
raise IscsiNodeError(rc, out,
err)</code></pre><pre><br></pre></div></d=
iv></div></div><div>In my environment I don't see these kinds of
problems.<=
/div><div>I'm using plain CentOS 7.3 hosts as hypervisors; is this your cas=
e too or are you using ovirt-ng nodes?</div><div><br
data-mce-bogus=3D"1"><=
/div></blockquote><div>Plain CentOS 7.3 hosts also. Built from a Minimal
ce=
ntos and adding oVirt repositories.<br></div><div><br
data-mce-bogus=3D"1">=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px
0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div
style=3D"=
font-family:arial,helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"><di=
v><div><p
style=3D"margin:0px">--------------------------------------------=
------------------------------------------------</p></div></div><div><br><d=
iv>"strict mode" is enforced for second interface, and it no longuer works.=
..</div><div>Which means - at least - that there is no redundancy in case o=
f hardware faillure and this is not acceptable for our production needs.<br=
</div><br><div>What is really strange is that we
have another "twin" site =
on another geographic region with simillar
hardware configuration and same =
oVirt installation, and this problem does not happen.</div><br><div>What
ca=
n be the root cause of this behaviour? How can I correct
it?<br></div><br><=
br></div></div></div></blockquote><blockquote><div>Actually
it is very stra=
nge to me to understand how you don't have problems on the other side.</div=
<div>My workaround to get multipath with EQL in oVirt was the
one explaine=
d here with screenshots:</div><div><a
href=3D"http://lists.ovirt.org/piperm=
ail/users/2017-March/080992.html"
target=3D"_blank">http://lists.ovirt.org/=
pipermail/users/2017-March/080992.html</a><br
data-mce-bogus=3D"1"></div><d=
iv>It has been working now for about 3 months without problems. We have sev=
eral Oracle RDBMS server VMs on it, from 2virtual threads and 8Gb of ram to=
16 threads (2-4-2) and 64Gb of ram </div><div>How did you configure
=
multipath instead? As far as I know oVirt will not let you do it.</div><div=
The only way would be to use bonding but that is not
certified/supported b=
y Dell.</div><div>HIH sharing
experiences,</div><div>Gianluca</div><div><br=
data-mce-bogus=3D"1"></div><div><br
data-mce-bogus=3D"1"></div></blockquot=
e><div>I've read the link you gave and it seems to me that you are using th=
e same physical interface for SAN and vm network.<br></div><div>In my
setup=
: </div><div> - SAN network is using two disctinct physical
interfac=
es (p2pX) on same subnet (therefore the need for sysctl
patch)<br></div><di=
v> - VM network (p1pX) is using 2 other distinct physical interfaces =
on "trunk" mode<br
data-mce-bogus=3D"1"></div><div> - Administration =
network (emX) is using 2 distinct bonded network interfaces <br data-mce-bo=
gus=3D"1"></div><div><br
data-mce-bogus=3D"1"></div><div>Our setup, using a=
total of 6 network interfaces is "simpler" than yours since each interface=
has a "disctinct" role.<br
data-mce-bogus=3D"1"></div><div><br data-mce-bo=
gus=3D"1"></div><div>To make multipath work with oVirt on this
setup, we ha=
d to configure SAN network on system before installing oVirt (using sysctl.=
conf above), </div><div> - next declare 2 SAN networks on oVirt that
=
are "dragued" to each SAN interface in host network configuration,
</div><d=
iv> - and finally, in datacenter listing, chosing a datacenter and se=
lecting "iSCSI Multipathing" tab below I can add a multipath configuration =
concerning both SAN oVirt networks and relevant iqn storage targets.<br dat=
a-mce-bogus=3D"1"></div><div><br
data-mce-bogus=3D"1"></div><div>Hope it's =
clear, if not, please ask me.<br
data-mce-bogus=3D"1"></div><div><br data-m=
ce-bogus=3D"1"></div><div>It's very strange to me also since
this configura=
tion did work great on our labs. But half of production sites have the prob=
lem decribed above : second SAN interface stops working uppon host activati=
on because vdsm forces sysctl net.ipv4.conf.p2p2.rp_filter to 1 (strict mod=
e).<br data-mce-bogus=3D"1"></div><div><br
data-mce-bogus=3D"1"></div><div>=
Still searching for clues as why this behaviour...<br
data-mce-bogus=3D"1">=
</div></div></div></div><br></div></div></body></html>
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