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that means that de-facto the MTU on the nic is wrong, we only report the right number to the engine (the cfg file is updates but not read to running configuration).
Meni,
when you verifying this bug please try following scenario too:
1. Add 2 VLANed bridged networks with different custom MTUs
2. Run VM on network with lower MTU and check traffic
3. Remove network with higher MTU
4. Check that traffic on VM still OK
5. Check MTU changes in vdsCaps
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHSA-2012-1508.html
Created attachment 609376 [details] vdsm.log Description of problem: When there is two networks with different MTU attached to nic/BOND and we removing the network with the highest MTU getVdsCaps not displaying the right MTU. For example: NET_MTU_5000 and NET_MTU_9000 attached to BOND2 remove NET_MTU_9000 from the BOND. getVdsCaps report that BOND2 have 'mtu': '9000', and also for nics eth2 and eth3. vdsClient -s 0 getVdsCaps HBAInventory = {'iSCSI': [{'InitiatorName': 'iqn.1994-05.com.redhat:e3a49943b29'}], 'FC': []} ISCSIInitiatorName = iqn.1994-05.com.redhat:e3a49943b29 bondings = {'bond4': {'addr': '', 'cfg': {}, 'mtu': '5000', 'netmask': '', 'slaves': [], 'hwaddr': '00:00:00:00:00:00'}, 'bond0': {'addr': '', 'cfg': {}, 'mtu': '1500', 'netmask': '', 'slaves': [], 'hwaddr': '00:00:00:00:00:00'}, 'bond1': {'addr': '', 'cfg': {}, 'mtu': '9000', 'netmask': '', 'slaves': [], 'hwaddr': '00:00:00:00:00:00'}, 'bond2': {'addr': '', 'cfg': {'MTU': '5000', 'NM_CONTROLLED': 'no', 'STP': 'no', 'BONDING_OPTS': 'mode=4', 'DEVICE': 'bond2', 'ONBOOT': 'yes'}, 'mtu': '9000', 'netmask': '', 'slaves': ['eth2', 'eth3'], 'hwaddr': '00:14:5E:17:D4:64'}, 'bond3': {'addr': '', 'cfg': {}, 'mtu': '5000', 'netmask': '', 'slaves': [], 'hwaddr': '00:00:00:00:00:00'}} bridges = {'rhevm': {'addr': '10.35.97.59', 'cfg': {'IPADDR': '10.35.97.59', 'ONBOOT': 'yes', 'DELAY': '0', 'NM_CONTROLLED': 'no', 'NETMASK': '255.255.255.0', 'BOOTPROTO': 'none', 'DEVICE': 'rhevm', 'TYPE': 'Bridge', 'GATEWAY': '10.35.97.254'}, 'mtu': '1500', 'netmask': '255.255.255.0', 'stp': 'off', 'ports': ['vnet0', 'eth0']}, 'VVM_400_5000': {'addr': '', 'cfg': {'MTU': '5000', 'DELAY': '0', 'NM_CONTROLLED': 'no', 'STP': 'no', 'DEVICE': 'VVM_400_5000', 'TYPE': 'Bridge', 'ONBOOT': 'yes'}, 'mtu': '5000', 'netmask': '', 'stp': 'off', 'ports': ['bond2.500']}} clusterLevels = ['3.0', '3.1'] cpuCores = 2 cpuFlags = fpu,vme,de,pse,tsc,msr,pae,mce,cx8,apic,mtrr,pge,mca,cmov,pat,pse36,clflush,dts,acpi,mmx,fxsr,sse,sse2,ss,ht,tm,pbe,syscall,nx,lm,constant_tsc,arch_perfmon,pebs,bts,rep_good,aperfmperf,pni,dtes64,monitor,ds_cpl,vmx,est,tm2,ssse3,cx16,xtpr,pdcm,dca,lahf_lm,dts,tpr_shadow,model_Conroe cpuModel = Intel(R) Xeon(R) CPU 5150 @ 2.66GHz cpuSockets = 1 cpuSpeed = 2660.129 emulatedMachines = ['rhel6.3.0', 'pc', 'rhel6.2.0', 'rhel6.1.0', 'rhel6.0.0', 'rhel5.5.0', 'rhel5.4.4', 'rhel5.4.0'] guestOverhead = 65 hooks = {} kvmEnabled = true lastClient = 10.35.97.119 lastClientIface = rhevm management_ip = memSize = 15951 netConfigDirty = True networks = {'rhevm': {'iface': 'rhevm', 'addr': '10.35.97.59', 'cfg': {'IPADDR': '10.35.97.59', 'ONBOOT': 'yes', 'DELAY': '0', 'NM_CONTROLLED': 'no', 'NETMASK': '255.255.255.0', 'BOOTPROTO': 'none', 'DEVICE': 'rhevm', 'TYPE': 'Bridge', 'GATEWAY': '10.35.97.254'}, 'mtu': '1500', 'netmask': '255.255.255.0', 'stp': 'off', 'bridged': True, 'gateway': '10.35.97.254', 'ports': ['vnet0', 'eth0']}, 'VVM_400_5000': {'iface': 'VVM_400_5000', 'addr': '', 'cfg': {'MTU': '5000', 'DELAY': '0', 'NM_CONTROLLED': 'no', 'STP': 'no', 'DEVICE': 'VVM_400_5000', 'TYPE': 'Bridge', 'ONBOOT': 'yes'}, 'mtu': '5000', 'netmask': '', 'stp': 'off', 'bridged': True, 'gateway': '0.0.0.0', 'ports': ['bond2.500']}} nics = {'eth3': {'permhwaddr': '00:14:5E:17:D4:66', 'addr': '', 'cfg': {'DEVICE': 'eth3', 'STP': 'no', 'MTU': '5000', 'NM_CONTROLLED': 'no', 'MASTER': 'bond2', 'HWADDR': '00:14:5E:17:D4:66', 'SLAVE': 'yes', 'ONBOOT': 'yes'}, 'mtu': '9000', 'netmask': '', 'hwaddr': '00:14:5E:17:D4:64', 'speed': 1000}, 'eth2': {'permhwaddr': '00:14:5E:17:D4:64', 'addr': '', 'cfg': {'DEVICE': 'eth2', 'STP': 'no', 'MTU': '5000', 'NM_CONTROLLED': 'no', 'MASTER': 'bond2', 'HWADDR': '00:14:5E:17:D4:64', 'SLAVE': 'yes', 'ONBOOT': 'yes'}, 'mtu': '9000', 'netmask': '', 'hwaddr': '00:14:5E:17:D4:64', 'speed': 1000}, 'eth1': {'addr': '', 'cfg': {'DEVICE': 'eth1', 'HWADDR': '00:15:17:3D:CD:CF', 'ONBOOT': 'yes'}, 'mtu': '5000', 'netmask': '', 'hwaddr': '00:15:17:3D:CD:CF', 'speed': 1000}, 'eth0': {'addr': '', 'cfg': {'BRIDGE': 'rhevm', 'UUID': 'e83bf01b-a688-48a9-a550-1a5d1794d4eb', 'NM_CONTROLLED': 'no', 'DEVICE': 'eth0', 'BOOTPROTO': 'none', 'HWADDR': '00:15:17:3D:CD:CE', 'ONBOOT': 'yes'}, 'mtu': '1500', 'netmask': '', 'hwaddr': '00:15:17:3D:CD:CE', 'speed': 1000}} operatingSystem = {'release': '6.3.0.3.el6', 'version': '6Server', 'name': 'RHEL'} packages2 = {'kernel': {'release': '279.5.2.el6.x86_64', 'buildtime': 1344933399.0, 'version': '2.6.32'}, 'spice-server': {'release': '10.el6', 'buildtime': '1337611492', 'version': '0.10.1'}, 'vdsm': {'release': '31.0.el6_3', 'buildtime': '1346138207', 'version': '4.9.6'}, 'qemu-kvm': {'release': '2.298.el6_3', 'buildtime': '1343061272', 'version': '0.12.1.2'}, 'libvirt': {'release': '21.el6_3.4', 'buildtime': '1345003094', 'version': '0.9.10'}, 'qemu-img': {'release': '2.298.el6_3', 'buildtime': '1343061272', 'version': '0.12.1.2'}} reservedMem = 321 software_revision = 31.0 software_version = 4.9 supportedProtocols = ['2.2', '2.3'] supportedRHEVMs = ['3.0', '3.1'] uuid = 730B44F9-7683-3678-B843-F36FA3BFA798_00:14:5E:17:D4:64 version_name = Snow Man vlans = {'bond2.500': {'cfg': {'BRIDGE': 'VVM_400_5000', 'VLAN': 'yes', 'MTU': '5000', 'NM_CONTROLLED': 'no', 'STP': 'no', 'DEVICE': 'bond2.500', 'ONBOOT': 'yes'}, 'netmask': '', 'iface': 'bond2', 'addr': '', 'mtu': '5000'}} vmTypes = ['kvm'] Version-Release number of selected component (if applicable): vdsm-4.9.6-31.0.el6_3.x86_64 How reproducible: 100% Steps to Reproduce: 1.Create two networks with MTU - NET-5000 and NET-9000 and attach them to BOND. 2.Open SetupNetworks and remove NET-9000 from the BOND. Actual results: getVdsCaps report that the BOND mtu is 9000 and the nics mtu is 9000 Expected results: getVdsCaps should report that the BOND mtu is 5000 and the nics mtu is 5000