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

[John Florian]

On 12/19/2015 05:53 AM, Gianluca Cecchi wrote:
> On Sat, Dec 19, 2015 at 1:08 AM, John Florian <jflorian at doubledog.org
> <mailto: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?

Because my storage is iSCSI and I need the VLAN configuration in place
for the Host to access it on behalf of the HE.  Otherwise, yes I agree
it would be easier to let the hosted-engine script deal with the set
up.  I've done a workable setup before letting the script do everything,
but the mode 4 bonding only gave me half the possible performance
because in effect one NIC on the NAS did all the transmitting while the
other NIC did all the receiving.  So I really need all of the storage
network setup in place prior to starting the HE deployment.

It seems like it should be trivial to convince the engine that the two
netmasks are indeed equivalent.  I tried changing in
/var/lib/vdsm/persistence/netconf/nets/ovirtmgmt the '"prefix": "24"'
setting to '"netmask": "255.255.255.0"' and running
/usr/share/vdsm/vdsm-restore-net-config but that didn't seem to change
anything WRT the network being out of sync.

> 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?
>
> HIH,
> Gianluca


-- 
John Florian

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