From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: Exporting "SD" device. Date: Tue, 13 Jun 2006 16:29:54 -0500 Message-ID: <448F2E52.10309@us.ibm.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "P M, Priya" Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com List-Id: xen-devel@lists.xenproject.org P M, Priya wrote: > Hi, > > We have Intel VT enabled system loaded with Xen 3.0.2 and qemu based > FC5+linux 2.6.16 as a guest operating system. We want to export the > disk to the domain 1 (FC5_linux 2.6.16) as "SD" device. But we are not > able to export the SCSI disk as a SD device, we could export as a "HD" > device. > > In the Configuration file, > > disk = [ > 'file:/home/adteam/linux_fc5_2.6.16,ioemu:hda,w',*'phy:/dev/sdd,ioemu:hdb,w'* > ] > > if we use ioemu:hdb, then the device is exported to the domain 1 and > we could see the device. > ioemu:hdb is the syntax for FV devices. For FV, we only currently support exposing as IDE devices. > If we use > > disk = [ > 'file:/home/adteam/linux_fc5_2.6.16,ioemu:hda,w',*'phy:/dev/sdd,/dev/sdb,w'* > ] > This is only valid syntax for PV domains. > /dev/sdb, then the device is not seen on domain 1. > > Are we missing something. Is it not possible to export an SD device to > domain 1? Is there any limitiation in qemu based domain 1, because our > domain 0 is qemu based operating system. > > Is there any performance difference between "hda" and "sda" exported > devices??? > There is no support for SCSI emulator ATM. It is on the Roadmap though and it ought to have a pretty significant performance impact. It's going to take a fair bit of time to realize that though. Regards, Anthony Liguori > Thanks. > > ------------------------------------------------------------------------ > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >