> > Hi all, > > I have a strange issue i can't figure out (it is a very big issue as my > production clusters relay on it)... > first about the environment (just the part that is relevant). > 1 CEC with 2 z/VMs. > Each z/VM shares an OSA port with the other (VLAN Aware). > i have a linux guest on each z/VM on the same VLAN (connected with access > mode). > Actions taken to reproduce the problem: > 1. strart an alias on guest1 > ifconfig eth0:8 192.168.41.40/27 up > 2. ping is ok from my PC and from both linux guests > 3. stop the alias on guest1 > ifconfig eth0:8 192.168.41.40/27 down > 4. no ping > 5. start the alias on guest2 > ifconfig eth0:8 192.168.41.40/27 up > 6. ping is ok from both guests but not from my PC > 7. stop the alias on guest2 > ifconfig eth0:8 192.168.41.40/27 down > 8. no ping... > 9. start on guest 1 again > ifconfig eth0:8 192.168.41.40/27 up > 10. ping is ok from my PC and from both guests. > > now as the OSAs are using the same OSA card the outside MAC for the alias > IP address does not change although the LPAR has changed... > at first i thought that the problem is that both z/VM are using the same > MAC address prefix for the VSWITCHs... > i fixed that as you can see from the VSWITCH output bellow. > I am not sure what is wrong... > as from inside the MF every thing looks fine (that is from the same OSA). > the minute the request goes through the outside world (outside of the MF) > things are not working properly. > i am not sure who to blame here (probably something is miss configured at > the VSWITCH/Controller level - i just can't figure out what). > on the other hand ping is working fine from one guest to the other on stage > 6... so, both vswitchs should be fine. am i correct? > last one to blame is the OSA... > so, what information can i give you about the OSA? attached is the channel > information. > if each VSWITCH will use a different OSA then the problem goes away and > every thing is fine. > looks like the OSA doesn't know which LPAR to send the requests to > (actually sends it to the wrong LPAR)... > one more thing... the problem will also happen if i start stage one on > guest2 with a different IP address. it is all about which guest starts the > IP alias first... > > Thank in advance, > Offer Baruch >
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