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SCSI bus sharing error with raw mapping on Suse Enterprise
Hi!
We have two Suse Linux Enterprise 10 (64bit) that we want to share a raw mapped disk between, but as we mapp the disk to one of the VM's we can't mapp it to the other, the choice "Raw device mapping" is not possibly to select. Why is like this? In 3.0.x we didn't have this problem at all. We managed to do a workaround by configuring the disk at the same time on both VM's, but this can not be the right way?
And now we have another problem, because the VM's woulden't start if we placed the raw mapped disk on the same controller (scsi controller 0) as the OS system disk we added another controller (scsi controller 1) and placed the raw mapped disk on this one. Now the vm does start but when we try to do a vmotion it reports "Virtual machine is configured to use a device that prevents migration: Device 'SCSI controller 1' is a scsi controller engaged in scsi bus-sharing"
Does anyone know what we are doing wrong and how to get this right?
Thanks
F
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Make sure for SCSI controller 1 in the SCSI BUS sharing policy, you have selected virtual or physical.
Select Virtual: if both the VM's are on the same server
Select Physical: If VM"s are across different servers.
-Josh
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Hello Josh!
We put in the "vpxd.filter.rdmfilter" in VC and put the value to "false" so now we can se all raw mapped disk and make a connection from more then one vm. And we also changed the value on the scsi controller 1 to "none" so now vmotion works also :smileylaugh:
Thanks for your input.
F
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Hi!
I put the rdmfilter to false as well. But I cannot get the vmotion to work? Are there some other settings that you have?
Our goal would be to have 3 VM's to see one shared RDM (or .vmdk even better) with HA/DRS and vMotion enabled. Guest os is linux and we would like to run ocfs2 accross them. Has anyone succeeded with this kind of configuration?
If I setup SCSI bus sharing = virtual, I guess Vmotion will not work because after Vmotioning one VM, it would reside on a different host from the other VMs, am I right? Is there a way to use virtual bus sharing and still be able to Vmotion all of the VMs to another host for maintenance?
If I setup SCSI bus sharing = physical, Vmotion is disabled, I'm not sure why. Is there a way to work around this?
If I setup RDM for the shared disk, everything is fine except that apparently it's not possible to migrate two VMs to the same host. Is there a specific problem that arises with this? Since we have 3 VMs and 3 hosts, when we need ot shut down one host for maintenance, two VMs would need to be on the same host temporarily.
The clustering is not like MS cluster in the way that it doesn't really utilize the SCSI reservations and the main function is not to have bulletproof failover capabilities - just to share the disk for non-performance-critical storage. How could I make this work?
Best regards,
Andy
Freedom of Business