Re: [Qemu-devel] -snapshot and tmpsfs

2006-11-19 Thread Ottavio Caruso

> From: Michael McConnell 
> On Sat, 18 Nov 2006, Ottavio Caruso wrote:
> 
> > Are the writes to tmpfs (in a *nix guest OS) recorded to the
> > snapshotted image?
> > 
> > Example: /var/run on tmpfs
> > OS writes to /var/run. Bigger temp file or not?
> 
> This isn't a guaranteed certain answer, but IIRC tmpfs uses system
> RAM and 
> swap as its storage.  Therefore a guest writing into its tmpfs
> space would 
> only touch the host filesystem if it were to use the swapfile.
> 
> As you say you're using the snapshot mode it would, if the swapfile
> is 
> touched, go into the snapshot temp file, otherwise it wouldn't.
> 
> -- Michael "Soruk" McConnell
>Eridani Star System

As my guest OS (Debian) was filling /var/cache/apt/* with MB's of
stuff, I have modified /etc/fstab and mounted all /var/cache/apt and
children directories on tmpfs, then I have installed/uninstalled a
few packages. I have compared the size of the temp snapshot file with
the one generated before  and I have found no differences.
I wonder if that means something.

Ottavio Caruso


 

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Re: [Qemu-devel] -snapshot and tmpsfs

2006-11-18 Thread Michael McConnell
On Sat, 18 Nov 2006, Ottavio Caruso wrote:

> Are the writes to tmpfs (in a *nix guest OS) recorded to the
> snapshotted image?
> 
> Example: /var/run on tmpfs
> OS writes to /var/run. Bigger temp file or not?

This isn't a guaranteed certain answer, but IIRC tmpfs uses system RAM and 
swap as its storage.  Therefore a guest writing into its tmpfs space would 
only touch the host filesystem if it were to use the swapfile.

As you say you're using the snapshot mode it would, if the swapfile is 
touched, go into the snapshot temp file, otherwise it wouldn't.

-- Michael "Soruk" McConnell
   Eridani Star System

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[Qemu-devel] -snapshot and tmpsfs

2006-11-18 Thread Ottavio Caruso
Are the writes to tmpfs (in a *nix guest OS) recorded to the
snapshotted image?

Example: /var/run on tmpfs
OS writes to /var/run. Bigger temp file or not?

Thank you

Ottavio


 

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