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[Xen-users] qdisk and blktap

  • To: <xen-users@xxxxxxxxxxxxx>
  • From: "Yiming Zhang" <sdiris@xxxxxxxxx>
  • Date: Thu, 7 Mar 2013 17:34:44 -0000
  • Delivery-date: Thu, 07 Mar 2013 17:36:19 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: Ac4bVOU4O4TVJR/9QxmzZjo8tFwf1w==

Dear All,


I am studying mini-os with Xen-4.2.1 on Ubuntu 12.04 (Precise 64, Kernel Linux 3.2). I configure the domain_config file by adding an entry: disk = [ ‘file: disk-minios.img, hda, r’ ]. When I start mini-os (using “xl create -c domain-config”), a test thread reads sectors in an infinite loop, which makes mini-os and dom0 not able to response anymore.


I think it should not be a bug of mini-os. I noticed:

(1) when I started xend using “/etc/init.d/xencommons start”, it says “Starting QEMU as disk backend for dom0”.

(2) mini-os reports “backend at /local/domain/0/backend/qdisk/1/768” and “Failed to read /local/domain/0/backend/qdisk/1/768 /feature-flush-cache”.


I suspect it is because qdisk (the backend of blk driver) performs too bad (and doesn’t support feature-flush-cache). So I want to use blktap as the backend driver. Can anyone tell me how to do this on Ubuntu 12.04?


Thanks a lot!



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