12:16 p.m.
Hello,
I'm going to configure an environment where I would have:
- 2 x 1Gbit/s nics that I have to dedicate to ovirt mgmt network only, due
to design constraints
- 2 x 10Gbit/s nics where I have to configure all other VLANS
In particular I have to define:
1) a couple of VLANs for VMs
2) VLAN for live migration (can I defined more that 1 of this kind?)
3) VLAN for iSCSI against an EQL system
EQL guys keep saying that the only supported way to connect is through 2
different adapters and using multipath then. The iSCSI lan is on VLAN100
and I have to use it.
This brings in a problem in the way I can configure logical networks in
oVirt and a scenario where I create bond on top of vlan and not the reverse
as I normally do....
The desiderata would be something like this, having the two 10Gbit nics the
names eth2 and eth3 and vlan100 the one for iSCSI and vlan65 the one for
VMs, for example:
eth2 --- eth2.100 -- iSCSI IP 1
\ eth2.65 -------------------
\ __ bond65 -- IP
eth3 --- eth3.100 -- iSCSI IP 2 /
\ eth3.65 -------------------
Questions:
- does this work at all in Linux in general? I saw something with bonding
option use_carrier=1....
- in that case, can I then configure oVirt to use this configuration for
networks?
- is LACP supporto on switch an enabler or a stopper...?
Other suggestions?
Thanks in advance,
Gianluca
6:30 p.m.
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--_000_D7834E8EF7E74FEAA2A393343762408Cacroniscom_--
8:46 p.m.
On Tue, Mar 14, 2017 at 6:30 PM, Pavel Gashev <Pax(a)acronis.com> wrote:
I Pavel, thanks for the comment.
It could be a nice way to proceed ;-) Are you using it with oVirt?
Some considerations/questions:
- in the past I tested iSCSI offload with RH EL 5.5 (it was late 2010) with
some problems; then I also tested with RH EL 6 when still in beta with
better results. Not tested more anddidn't go to production as it was not
considered crucial. Can we consider it stable in RH EL / CentOS 7.3?
- I remeber that at 5.5 / 6beta times even when configuring offload iSCSI
you still needed to configure an ip on the interfaces in OS, because I seem
to rememebr the discovery phase (or login perhaps?) happened on tcp and not
capable in offload. Is this still true or can I only configure an ip for
the offload macs?
- is the offload configuration transparent to oVirt in the sense that oVirt
only needs that the hosts see the multipath iSCSI devices, or do I need to
make any particular config in oVirt too, then?
Thanks in advance,
Gianluca
9:13 p.m.
Il 14 Mar 2017 20:54, "Yaniv Kaul" <ykaul(a)redhat.com> ha scritto:
On Tue, Mar 14, 2017, 9:46 PM Gianluca Cecchi <gianluca.cecchi(a)gmail.com>
wrote:
oVirt sees it as FC. No need for IP.
Y.
Hi Yanuv, can you elaborate on this? I have not understood your comment...
Can I configure chap on storage side?
Gianluca
7 p.m.
On 03/14/2017 06:16 AM, Gianluca Cecchi wrote:
You can create a bonded interface, with as many physicals as you need.
You can then create tagged interfaces on the bonded interfaces.
You can then create bridges to those, with or without IPs depending
on what you are using them for.
In this example, the numbers, 100, 200, 300, and 400, represent VLAN
numbers.
bond0 -> bond0.100 -> ovirtmgmt 10.20.100.20 (examples only)
bond0 -> bond0.200 -> storage 10.20.200.20
bond0 -> bond0.300 -> vm
bond0 -> bond0.400 -> IPMI 10.20.400.20
There is no practical limit. However, the available hardware will determine
what is appropriate. With 2 x 10Gb interfaces, and 4 x 1Gb interfaces, this
might look very different.
Also, redundancy, switch fail-over, and other factors apply to decision
making
of how to set up networks on the hosts.
10:24 a.m.
On Tue, Mar 14, 2017 at 7:00 PM, Phil Meyer <pmeyer(a)themeyerfarm.com> wrote:
This is the standard way I'm using on other oVirt installations.
The problem here is with:
bond0 -> bond0.200 -> storage 10.20.200.20
that I can't do because the storage target is EQL and they don't support
bonding way to connect
Gianluca
3:03 p.m.
On 03/15/2017 04:24 AM, Gianluca Cecchi wrote:
...
that I can't do because the storage target is EQL and they don't
support bonding way to connect
...
There is more than one way to do bonded interfaces.
You must be doing something other than LACP.
Using LACP, (mode=4) the bonded interfaces have only one MAC address.
In other modes, each interface retains it MAC address.
This may be what is confusing the storage array(s). When packets are sent
to another device with multiple MAC addresses, the response MUST return
to the interface that it was sent from.
This is handled in tcp/ip settings for the kernel, in Linux.
You may want to check these sysctl values:
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.all.rp_filter = 2
The rp_filter values and meaning were redefined in newer kernels,
so you may have to research a bit.
Good luck.
2946
days inactive
2947
days old
8 comments
5 participants
participants (5)
-
Gianluca Cecchi -
Pavel Gashev -
Phil Meyer -
Phil Meyer -
Yaniv Kaul