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Re: [Xen-users] copying or dding from a VM-template resulting in the whole system getting stuck
- To: Jeff Sturm <jeff.sturm@xxxxxxxxxx>
- From: ma qiang <maqiang1984@xxxxxxxxx>
- Date: Fri, 15 Oct 2010 14:18:01 +0800
- Cc: xen-users@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 14 Oct 2010 23:19:13 -0700
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Thanks a lot. It works much better.By the way, what is the reasonable buffer size. I have tested many based on different computers, and shows different results. On Thu, Oct 14, 2010 at 9:17 PM, Jeff Sturm <jeff.sturm@xxxxxxxxxx> wrote:
This on Linux? I find copying image files with O_DIRECT is helpful.
With the “dd” command, try “iflag=direct” and “oflag=direct”. Use a reasonable buffer size, like bs=64k or so, to achieve a faster copy operation.
-Jeff
When I create a new VM by copying or dding from a VM-template, the cp/dd operation takes almost all the memory and gets one cpu rate to almost 100%, resulting in the whole system getting stuck.
anyone knows how to perform this with less cost?
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