Xen users - Mar 2013 - qdisk and blktap

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!

Yiming

 



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You must install blktap package (blktap-dkms) if not already done and insert
it on /etc/mudules.
You must also change from file to tap2 or use new disk configuration instead
of deprecated:
http://xenbits.xen.org/docs/unstable/misc/xl-disk-configuration.txt



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