Paul Gilmartin schrieb:
On 07/21/09 14:15, dick hoogendijk wrote:
OK, I've a question about the reliability of shared folders.
Host: OpenSolaris-b118 (all FS are ZFS) ; Guest: Windows XP (sp3)
Has 118 fixed the GUI problems of 116-117? Do I need VBox 3.x
to support Guest Additions of 118? I'm not upgrading beyond
2.2.4 until network performance problems in 3.x are fixed.
The maual is clear:
Shared folders allow you to access files of your host system from
within the guest system, much like ordinary shares on Windows networks
would -- except that shared folders do not need require networking.
Shared folders must physically reside on the host and are then shared
with the guest; sharing is accomplished using a special service on the
host and a file system driver for the guest, both of which are provided
by VirtualBox.
But what I'd like to know is how -SAFE- is it to read/write to share
folders on the ZFS filesytem from within XP? If it's safe I could share
my photo folders to have access from Photoshop in XP. If not I've to
copy all to the virtual windows machine.
I'm curious, too. Does the "special service on the host" use regular
host file operations (not, e.g., accessing the host FS as a block
special device?) If so, it should be immune to gross corruption of
the host FS, although it might overwrite individual files by garbling
pathnames, etc. How does it deal with different case-sensitivity
rules between host and guest?
On the host VirtualBox does regular userland accesses to the individual
files. No cheats, no shortcuts, no special caching. It's as safe as
sharing of files can be on Unix (IIRC our code doesn't use mandatory
file locking if the guest requests it - might change in the future).
I'd feel more comfortable running an NFS or Samba client/server
(either direction) between host and guest.
NFS has an advantage in the sense that it is a kernel mode service, and
thus has much more control over concurrent accesses. Samba is userland
like VirtualBox, so it should be more or less equivalent (especially as
I have never gotten locking to work exactly as expected by Windows -
that's a bit dated information howebver).
Klaus
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