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Linux - Virtualization and Cloud This forum is for the discussion of all topics relating to Linux Virtualization and Linux Cloud platforms. Xen, KVM, OpenVZ, VirtualBox, VMware, Linux-VServer and all other Linux Virtualization platforms are welcome. OpenStack, CloudStack, ownCloud, Cloud Foundry, Eucalyptus, Nimbus, OpenNebula and all other Linux Cloud platforms are welcome. Note that questions relating solely to non-Linux OS's should be asked in the General forum.

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Old 02-22-2010, 09:58 PM   #1
larold
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How do I force Xen to present same physical disk to multiple guests?


How do I force Xen to present physical devices to multiple guests simultaneously in read-write mode? (Read on before answering!)

I've got about 20 device files (multipath device files corresponding to SAN luns) on my physical host that I want presented read-write to three different guest OSes. By default, Xen tries to prevent me from doing this, which in many cases is understandable.

But what I want to do is legitimate. It's an Oracle environment, and any entity that's going to be writing to the devices in the guest OSes is cluster-aware, and will manage all of the reads/writes internally. This isn't going to be ext3. It will be a lot of OCFS2 and Oracle ASM.

Thanks in advance.
 
Old 02-22-2010, 10:18 PM   #2
larold
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Ah - looks like I found it. I used a '!' after the w in the 'phy' entry in the Xen config, and this seems to do what I need.

Any kinks I need to be aware of using this?
 
  


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