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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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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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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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Basically you cannot, directly from the dom0 But you can from a remote machine. Xen use VNC to provide graphical access to HVM VM. If you are using opensource Xen, in the VM config file you can add a line like : vfb = [ 'type=vnc,vncdisplay=1,vncpasswd=yourpassword,vnclisten=0.0.0.0,keymap=fr' ] then from a remote machine using a vnc client you connect ...


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Thank you for your points, finally i found the solution from the Link # xentop -b -i 2 -d 1 > /tmp/xentop # cat /tmp/xentop NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR VBD_RSECT VBD_WSECT SSID usernam --b--- 12 0.0 256000 ...



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