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[Qemu-devel] Re: [PATCH] Snapshot block device support

From: Rusty Russell
Subject: [Qemu-devel] Re: [PATCH] Snapshot block device support
Date: Thu, 03 Jul 2003 09:54:18 +1000

In message <address@hidden> you write:
> I had plans to implement "copy on write" disk images...I find your 
> approach original. My initial plan was just to add a second disk image 
> for each disk containing the changes. It should be easy to do it from 
> your code (for example by adding options '-hdacow file' where file is 
> the snapshot file you use).

Sure: I used a temporary (unlinked) file because I couldn't see much
point in keeping it around.  Since most filesystems do sparse files,
it's quite efficient, too.

-hdacow with an optional argument would work really well, if that's
 desired behaviour.

I'm glad I finally beat you to implementing something: you're usually
too quick 8)

> About IDE, it is working (at least with kernel 2.4.20). Someone has even 
> compiled a linux kernel inside QEMU (slowdown factor of about 15), so vl 
> begins to be usable for real tasks. There are still known problems if 
> several processes use floating point at the same time.

OK, I'm getting errors with IDE on 2.5, but shouldn't be too hard to
track down.

  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.

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