XenServer – Change Bonding Mode
Thursday, 13. August 2009
By default XenServer 5.5 uses source-based ARP load balancing (balance-slb or mode 7) for bonding. If this is needed to be changed to a different mode all that is needed to do is edit the file /opt/xensource/libexec/interface-reconfigure on line 863. Do this using the following command:
vi /opt/xensource/libexec/interface-reconfigure +863
once there the value for mode can be changed from “balance-slb” to any supported mode. Here is a list of the modes:
balance-rr
active-backup
balance-xor
broadcast
802.3ad
balance-tlb
balance-alb
balance-slb
See Linux Channel Bonding for more information on the types of bond modes. Unfortunately I could not find much information on balance-slb.
To check if the bond mode change worked correctly run
cat /proc/net/bonding/bond<bondnumber>
Run ifconfig to find the bondnumber.
This will list the bond mode and the slave interfaces to the bond.
Nils Rossmann Says:
Brian,
thanks for your helpful entry. As I’m using a xenserver oem from a sd-card, I can’t change this file because it is read-only.
I found a solution for this problem in this forum:
http://forums.citrix.com/thread.jspa?threadID=249554&tstart=0
xe pif-param-set uuid= other-config:bond-mode=
where is one of the above mentioned modes.
is the UUID of the bonding interface.
best regards
Nils
Nils Rossmann Says:
The blog tool removed the variables:
xe pif-param-set uuid=UUID other-config:bond-mode=MODE
where UUID is the UUID of the bonding interface and MODE is one of the above mentioned modes.
Jason Says:
It keeps saying read only file system so I can’t modify it. Any ideas?
nc Says:
Have you had any luck finding news on balance-slb? It appears to be a patch that Citrix is applying, but I’m not finding the source for it. Maybe I should grab the source kit and see if it’s in there..
Tina Says:
Brian you need to update this for XenServer 5.6
Robert Says:
You can find the official description of citrix “balance-sbl” on the XenServer Administrator’s Guide
http://docs.vmd.citrix.com/XenServer/5.6.0/1.0/en_gb/reference.html#networking-concepts-nic_bonds
please also note the last note. It does describe the 3.1 seconds delay highlighted by Bret Palsson
WARNIG: looks also like that using mode 802.3ad in XenServer 5.6 goes to panic the kernel (read last posts in this thread http://forums.citrix.com/thread.jspa?messageID=1425438)
R.
Bob Says:
@Tina
The method Nils Rossmann described works on 5.6.
xe pif-param-set uuid=UUID other-config:bond-mode=MODE
where UUID is the UUID of the bonding interface and MODE is one of the above mentioned modes.
Bruno Says:
@Bob
Can you tell me in which file this can be changed on 5.6? Because there is no line 836
Dave Says:
@Bruno
Look at InterfaceReconfigureBridge.py and InterfaceReconfigureVswitch.py. They both set a bond mode. If you search for “balance” you will find the lines.
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