Am Dienstag, den 31.03.2009, 04:08 -0400 schrieb John A. Sullivan III:
> On Tue, 2009-03-31 at 06:51 +0000, Christoph Lukas wrote:
> > Hi John,
> > > Hello, all. In our earlier deployments on kernel 2.6.22, we were very
> > > happy with the results of vhashify. For some reason, our use in
> > > 188.8.131.52 using vserver 184.108.40.206.4 does not seem to be working as well.
> > > This is important to us because we are planning roughly 400 nearly
> > > identical guests on this one host.
> > >
> > > We currently have 10 Ubuntu 8.0.4 guests running on our CentOS 5.2 based
> > > host. Each one is roughly 2GB in size and were all cloned from the same
> > > template. Total storage on the vserver partition is roughly 21GB. The
> > > only unusual bit about this installation is there is /vservers/vetc
> > > directory which is then mounted via bind to /etc/vservers. This was
> > > originally because there was a single encrypted partition mounted via
> > > iSCSI holding all the vserver information.
> > >
> > > We've done:
> > > mkdir /etc/vservers/.defaults/apps/vunify/hash /vservers/.hash
> > > ln -s /vservers/.hash /etc/vservers/.defaults/apps/vunify/hash/root
> > >
> > > We noticed there is another
> > > link, /etc/vservers/.defaults/apps/vunify/hash/00
> > > and hashify complained of a duplicate "root"directory so we deleted the
> > > root symlink. With or without it, we have the same results.
> > are there any hardlinks visible inside the /vservers/.hash directory? If
> > not the hashify did not work.
> > You can check which files inside the vservers are not unified by running
> > find /vserver/<guest> -type f -links 1
> > and the unified files by running:
> > find /vserver/<guest> -type f -links +1
> > This should give you a hint if vhashify worked correctly.
> > > For each vserver guest, we did:
> > > mkdir /etc/vservers/<name>/apps/vunify
> > >
> > > Has something changed with 220.127.116.11?
> > AFAIK unification is just done in userspace it should not depend on the
> > kernel version. Just the copy-on-write-link-breakage is done in the
> > kernel.
> > > Are these realistic numbers?
> > Does not seem realistic to me.
> > > I
> > > would think ten identical systems should yield just slightly more than
> > > the space of one system after running hashify.
> > I would guess something with your .hash directories is not setup
> > correctly and therefore the hashify did nor work as expected. You can
> > try to fix this and then just run:
> > vserver <guest> hashify
> > on a running guest. I have setup unification successfully here and used
> > this two wiki pages as howto:
> > http://linux-vserver.org/Frequently_Asked_Questions#Unification
> > http://linux-vserver.org/util-vserver:Vhashify
> > Hope this helps,
> > Christoph
> Thank you, Christoph. The commands show plenty of both types of files
> with the hard links clearly outweighing the regular files. Strange that
> I still show 20GB for 10 servers. Take care - John
Are you sure that your measurements of disk usage are correct?
Do the 20 GB disk usage correspond with the df output on the /vservers
du -sch /vservers/*
should notice multiple hardlinks and count them only once.
Received on Tue Mar 31 09:40:52 2009