Red Hat Bugzilla – Bug 812306
Vblade export to bridge, no etherdrive seen in virtual
Last modified: 2013-02-13 10:03:10 EST
Description of problem:
Version-Release number of selected component (if applicable):
If you export a etherdrive to a bridge with a vnet to a kvm virtual machine, the virtual will not see the drive. It is dicovered during a setup where local disks of 2 machines are mirrored with MD-devices by using etherdrives within the guest. After some investigation I found out when you do the same on the Ubuntu platform it works. Ubuntu is using the vblade version of Coraid so I downloaded the source and compiled it on Fedora and RH 6.2 EL and the problem was gone. Please update the rpm with the latest vblade sources. Also worthful is to take a look at the aoe-drivers off Coraid and upgrade also aoe-tools to a higher version. Be aware the scripts of Coraid has some minor bugs in it because some of the files/devices are placed in other directories outside /dev/etherd/... and are not adjusted in the scripts such as aoe-discover.
Steps to Reproduce:
1. Create a LVM volume or disk-image and export this with vblade to a bridge used also by a KVM virtual. You can also use a ISO image to export. KVM virtual must run on the same host where the export takes place.
2. Modprobe or activate the aoe driver in the virtual, the drive is not appearing.
3. Download the source code of Coraid and compiled it. Stop the original vblade with a kill and use the newly build vblade to export the LVM volume/disk-image.
Perform a aoe-stat in the virtual and it will be seen if not try a aoe-discover and repeat aoe-stat.
If this is available for virtuals you can hide on host-level the storage luns by using MAC-masking. Using separate networkcards without any IP traffic on it can enhance security for virtual DMZ servers, using AoE has lesser overhead then for example NFS/iSCSI. Using Intel servers with a storage bay will be more valuable to use because it will deliver a cheap way to do live-migrates between the hosts. It is also very easy to setup so it would be also nice to include AoE within the Anaconda installer or Kickstart in the near future.
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