[nSLUG] vmware for Linux virtualization on production servers
ian at slu.ms
Thu Mar 12 23:25:51 ADT 2009
On Thu, Mar 12, 2009 at 10:28:51PM -0300, Hatem Nassrat wrote:
> > > Doesn't seem to have the benefits of journaling or this wouldn't be
> > > happening.
> > I'm not sure what "it" is in this context. If you're talking about
> > something like Workstation/Fusion/Server/Player then it will have the
> > benefits of whatever your underlying filesystem is. Journalling isn't
> > a magic bullet, if you kill the power and updates haven't been flushed
> > to disk, they get lost.
> There are a few silver bullets though. I have recently heard about ZFS,
> a filesystem that supports rollbacks and instant backups.
Right, but it doesn't support "magic"
If the data hasn't been synced to disk then any sort of outage will
result in a loss thanks to write caching. You may have read about it
the other day in that EXT4 story on slashdot. What I was saying is
that this is true for all virtualization packages, not just VMware.
KVM is not immune from leaving things in a bad state if things are
> What I dislike most about vmware, is that it is not open source, so
> whats free now may not be later. I will be trying out:
> It seems cool and it supports an unlimited number snapshots per vm. It
> also runs on Linux, Solaris, OS X and Windows.
Nobody using this in a production environment is going to be doing it
without a support contract of some sort unless they're a glutton for
punishment, so free probably isn't a major concern. It shouldn't be,
VirtualBox is buggy, has poor USB support, and the snapshot system can
(amusingly for me, probably not amusingly for you) lose data.
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