[haiku-development] Re: QEMU in Linux

On 2008-07-13 at 18:46:54 [+0200], Axel Dörfler <axeld@xxxxxxxxxxxxxxxx> 
wrote:
> Ingo Weinhold <ingo_weinhold@xxxxxx> wrote:
> > since I can't use VMware with the actual HD (due to missing SCSI
> > suppport
> > in Haiku) I tried using qemu 0.9 in Linux (OpenSuse 10.3 with kernel
> > 2.6.22.5). Unfortunately qemu seems to see an old state of the disk
> > when I
> > run it, i.e. when running qemu after updating the Haiku partition
> > (/dev/sda7) via the build system the changes to the disk don't appear
> > to
> > have happened. They clearly did happen, of course -- bfs_shell sees
> > the
> > current state and after rebooting also qemu does. "sync" doesn't
> > help, nor
> > does running qemu with or without "-snapshot" or "-no-kqemu".
> > 
> > Any ideas how this can be fixed?
> 
> Nope, but I certainly ran into this more than once so far :-)
> What's your problem with VMware exactly, though?

I can add a physical disk as virtual disk, but it is presented as a SCSI 
disk, which doesn't work in Haiku.

> Anyway, I briefly had a look in Google, and could only find this:
> 
> "The problem is actually that the linux block cache doesn't make any
> consistency between /dev/hda and /dev/hda6, so if you give /dev/hda to
> qemu, qemu writings won't be consistent with mounting /dev/hda6 in
> linux. You can give /dev/hda6 directly to qemu and it will be fine."
> [http://www.bddebian.com/~wiki/hurd/running/qemu/]
> 
> Maybe you can work around it like this.

No, I primarily wanted to play with partitions. But maybe there's some way 
to tell Linux to sync the block caches. Will have a look.

CU, Ingo

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