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I don't know how to avoid it, but the following (quick and dirty) solutions work for me. Solution 1: Shutdown the machine, make a fast copy and start the copy. After checking the copied vm you can delete the original machine. Solution 2: Restart the xenserver where the vm was running on.


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Changing the pool master won't take down the host or any of the VMs. It will cause a restart of the management service (XAPI) of all pool hosts, so that management access via Citrix XenCenter or CLI (xe commands) won't work for 10-30 seconds. Once the service is restarted, you can reconnect to the poolmaster or a slave via XenCenter (you'll be redirected to ...


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You need to start the installer with inst.vnc option. Select option "Install CentOS 7" and then press [tab]. Remove 'quiet' and add 'inst.vnc' to kernel command line. Press [enter]. After that, wait till the kernel spins up, and you'll end up with the following message: All you need to do now is use vnc client to connect to IP shown in the message. ...


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I've seen near native disk performance with PV guests, with the MD work being done at both the dom0 and domU levels. If you can, try setting up guest as paravirtualized (PV) instead of a hardware virtual machine (HVM). Also, for either PV or HVM, try assigning the whole drives to the guest and having it handle the RAID stuff (MD). See what works best for ...


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Some more investigation turned up the fact that this is not a unique issue (see for example https://bugzilla.redhat.com/show_bug.cgi?id=500145). Following some suggestions there, further investigation with iostat showed that the average write size on the domU was somewhere lower than 128KiB, while on the dom0 was about 512KiB (found by dividing wkB/s / w/s). ...



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