[ovirt-users] 3.6.1 HE install on CentOS 7.2 resulted in unsync'd network

[Dan Kenigsberg]

On Sun, Dec 20, 2015 at 12:13:15PM +0200, Yedidyah Bar David wrote:
> On Sat, Dec 19, 2015 at 12:53 PM, Gianluca Cecchi
> <gianluca.cecchi at gmail.com> wrote:
> > On Sat, Dec 19, 2015 at 1:08 AM, John Florian <jflorian at doubledog.org>
> > wrote:
> >>
> >> I'm trying to get a 3.6.1 HE setup going where I have 4 VLANs (VIDs
> >> 101-104) for storage networks, 1 VLAN (VID 100) for ovirtmgmt and 1 more
> >> (VID 1) for everything else.  Because I know of no way to manipulate the
> >> network configuration from the management GUI once the HE is running and
> >> with only a single Host, I made the OS configuration as close as possible to
> >> what I'd want when done.  This looks like:
> >
> >
> > Why do you think of this necessary pre-work? I configured (in 3.6.0) an
> > environment with HE too on a single host and I only preconfigured my bond1
> > in 802.3ad mode with the interfaces I planned to use for ovirtmgmt and I
> > left the other interfaces unconfigured, so that all is not used by Network
> > Manager.
> > During  the "hosted-engine --deploy" setup I got this input:
> >
> >            --== NETWORK CONFIGURATION ==--
> >
> >           Please indicate a nic to set ovirtmgmt bridge on: (em1, bond1,
> > em2) [em1]: bond1
> >           iptables was detected on your computer, do you wish setup to
> > configure it? (Yes, No)[Yes]:
> >           Please indicate a pingable gateway IP address [10.4.168.254]:
> >
> > and then on preview of configuration to apply:
> >
> >           --== CONFIGURATION PREVIEW ==--
> >
> >           Bridge interface                   : bond1
> >           Engine FQDN                        : ractorshe.mydomain.local
> >           Bridge name                        : ovirtmgmt
> >
> > After setup I configured my vlan based networks for my VMS from the GUI
> > itself as in the usual way, so that now I have this bond0 created by oVirt
> > GUI on the other two interfaces (em1 and em2):
> >
> > [root at ractor ~]# cat /proc/net/bonding/bond0
> > Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
> >
> > Bonding Mode: IEEE 802.3ad Dynamic link aggregation
> > Transmit Hash Policy: layer2 (0)
> > MII Status: up
> > MII Polling Interval (ms): 100
> > Up Delay (ms): 0
> > Down Delay (ms): 0
> >
> > 802.3ad info
> > LACP rate: fast
> > Min links: 0
> > Aggregator selection policy (ad_select): stable
> > Active Aggregator Info:
> >     Aggregator ID: 2
> >     Number of ports: 2
> >     Actor Key: 17
> >     Partner Key: 8
> >     Partner Mac Address: 00:01:02:03:04:0c
> >
> > Slave Interface: em1
> > MII Status: up
> > Speed: 1000 Mbps
> > Duplex: full
> > Link Failure Count: 0
> > Permanent HW addr: 00:25:64:ff:0b:f0
> > Aggregator ID: 2
> > Slave queue ID: 0
> >
> > Slave Interface: em2
> > MII Status: up
> > Speed: 1000 Mbps
> > Duplex: full
> > Link Failure Count: 0
> > Permanent HW addr: 00:25:64:ff:0b:f2
> > Aggregator ID: 2
> > Slave queue ID: 0
> >
> > And then "ip a" command returns:
> >
> > 9: bond0.65 at bond0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
> > master vlan65 state UP
> >     link/ether 00:25:64:ff:0b:f0 brd ff:ff:ff:ff:ff:ff
> > 10: vlan65: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
> > UP
> >     link/ether 00:25:64:ff:0b:f0 brd ff:ff:ff:ff:ff:ff
> >
> > with
> > [root at ractor ~]# brctl show
> > bridge name    bridge id        STP enabled    interfaces
> > ;vdsmdummy;        8000.000000000000    no
> > ovirtmgmt        8000.002564ff0bf4    no        bond1
> >                             vnet0
> > vlan65        8000.002564ff0bf0    no        bond0.65
> >                             vnet1
> >                             vnet2
> >
> > vnet1 and vnet2 being the virtual network interfaces of my two running VMs.
> >
> > The only note I can submit is that by default when you set a network in
> > oVirt GUI with mode=4 (802.3ad), it defaults to configuring it with
> > "lacp_rate=0" so slow, that I think it is bad, as I read in many articles
> > (but I'm not a network guru at all)
> > So that I chose custom mode in the GUI and specified "mode=4 lacp_rate=1" in
> > options and this was reflected in my configuration as you see above in bond0
> > output.
> >
> > Can we set lacp_rate=1 as a default option for mode=4 in oVirt?
> 
> No idea, adding Dan. I guess you can always open an RFE bz...
> Dan - any specific reason for the current defaults?

lacp_rate=0 ('slow') is the default of the bonding module in mode=4, and
we do not change that (even though we could).

Please open an RFE, citing the articles that recomend the usage of
faster rate. Until then - configure Engine's custom bond option to your likings.