Re: [Xen-users] Question about ioemu ...

[virtual@xxxxxxxxxxxxx]

>> > My HDA is configured like this: 

>> > 

>> > disk = [ 'phy:/dev/vms_1/win01,hda,w' ] 

>> > 

>> > My question , what is the diference if I configure like this ...


>> > 

>> > disk = [ 'phy:/dev/vms_1/win01,ioemu:hda,w' ] 

>> > 

>> > What "ioemu" means ? 

>> 

>> It's simply a rudimentary attempt at ParaVirtual (PV) disk drivers on
an 

>> HVM domain. Try it both ways, and 'cp' a *new* file to or from your
dom0 

>> and HVM domain, and time the difference. (I say new file, so you 

>> don'tmeasure the effects of caching.) 

> 

> I don't think the "ioemu" argument actually does anything for
block devices 

> anymore. As Jim suggested, it used to be used to specify whether a block 

> device is an emulated (ioemu) or a paravirt disk. Nowadays, I think HVM 

> supports both paravirt and emulated modes for each disk so the switch isn't


> used. 

So ... it has no diference, right ? this is my question, I tested ,
and it worked

on both way. For me ..make a copy from dom0 to domU has no sense,
it use

network. It is not a copy from a partition to another, because I'm using
NTFS 

on a LVM virtual partition. Frorm my windows on DomU, I
don't have acess 

to Dom0  (centOS) file system and vice-versa ..  

> 

> PV drivers need to be enabled explicitly in the HVM guest, so you won't be


> able to measure a performance difference in IO unless you first install and


> configure these drivers. 

> 

> Cheers, 

> Mark 

> 

> -- 

> Dave: Just a question. What use is a unicyle with no seat? And no pedals!


> Mark: To answer a question with a question: What use is a skateboard? 

> Dave: Skateboards have wheels. 

> Mark: My wheel has a wheel! 

> 





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