RE: [Xen-users] drbd8 - lvm - xen

["Robert Dunkley" <Robert@xxxxxxxxx>]

You should be referencing the DRB device in the Xen config file, not the
physical device. If you setup the DRBD device shown below then you would
reference "/dev/drbd1" in the Xen config file.

Rob

resource xendrbd1 {
  protocol C;
  startup { wfc-timeout 0; degr-wfc-timeout     120; }
  disk { on-io-error detach; } # or panic, ...
  net {  cram-hmac-alg "sha1"; shared-secret "XXxxXXxx";after-sb-0pri
discard-zero-changes;after-sb-1pri discard-secondary;max-buffers 8192; }
  syncer { rate 500M; }
  on fqdn1.co.uk {
    device /dev/drbd1;
    disk /dev/lvmgroup/lvmpartition;
    address 192.168.6.160:7789;
    meta-disk internal;
  }
  on fqdn2.co.uk{
    device /dev/drbd1;
    disk /dev/lvmgroup/lvmpartition;
    address 192.168.6.161:7789;
    meta-disk internal;
  }
}

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Sebastian
Igerl
Sent: 11 September 2008 10:45
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] drbd8 - lvm - xen

oups.. forgot the text :-)


i did.. and e.g. /dev/sda5 without drbd gives the same error...
but just with 
xen-3.3.0 !

On Thu, 2008-09-11 at 11:08 +0200, Sebastian Igerl wrote:
> On Thu, 2008-09-11 at 09:42 +0100, Robert Dunkley wrote:
> > The DRBD device is in use by Dom0 or another DomU. Try one DRBD
device
> > per VM, if you have already done this then make sure the DRBD device
is
> > NOT mounted in Dom0.
> > 
> > Rob
> > 
> > -----Original Message-----
> > From: Sebastian Igerl [mailto:sig@xxxxxxxxx] 
> > Sent: 11 September 2008 09:36
> > To: Robert Dunkley
> > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: RE: [Xen-users] drbd8 - lvm - xen
> > 
> > Hi,
> > 
> > Found out that it didn't had anything to to with drbd or lvm... 
> > 
> > I upgraded from 3.2.1  to xen-3.3.0...
> > 
> > No i can't start any domu's... regardless if they are on lvm drbd
oder
> > local partiton...
> > 
> > Does anyone has any idea ?
> > 
> > xen4 conf # xm create test1.cfg 
> > > Using config file "./test1.cfg".
> > > Error: Device 768 (vbd) could not be connected.
> > > Device /dev/xen3and4/hd23 is mounted in the privileged domain,
> > 
> > 
> > 
> > xen4 conf # xm create test1.cfg 
> > > Using config file "./test1.cfg".
> > > Error: Device 768 (vbd) could not be connected.
> > > Device /dev/sda5 is mounted in the privileged domain,
> > 
> > 
> > 
> > 
> > another thing is... : is ist possible to make 20 different drbd
devices
> > on one host ? drbd0 - drbd20 ? aren't there limits ? 
> > 
> > 
> > On Wed, 2008-09-10 at 15:27 +0100, Robert Dunkley wrote:
> > > Hi Sebastian,
> > > 
> > > I think you should split the volume into LVM partitions and then
run a
> > > DRBD device for each partition. I run this config, RaidArray ->
LVM ->
> > > DRBD8 -> Xen and it works well. You need the independence of one
drbd
> > > device per VM otherwise things are difficult. You may also want to
ask
> > > xen-users -at- antibozo.net for their DRBD script, on my Centos
Xen
> > 3.30
> > > setup it works much better, it also avoids the need for IMHO
dangerous
> > > dual primary config.
> > > 
> > > I synch multiple arrays with multiple DRBD devices at once. DRBD
> > equally
> > > shares the array write bandwidth between DRBD devices. My Raid1
arrays
> > > manage 80Mb/second each write speed, 2 DRBD devices synching at
once
> > on
> > > each of the 3 arrays yields 40mb.sec per DRBD device which totals
a
> > > perfect 240Mb/sec synch rate (I used Infiniband to link the two
DRBD
> > > servers together so am not bound by the bandwidth constraints of
GB
> > > Ethernet). 
> > > 
> > > Rob
> > > 
> > > -----Original Message-----
> > > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
Sebastian
> > > Igerl
> > > Sent: 10 September 2008 14:54
> > > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > > Subject: [Xen-users] drbd8 - lvm - xen
> > > 
> > > Hi,
> > > 
> > > What I'm trying to to is to set up 1 drbd active/active device
then
> > > split this with lvm creating about 20 volumes and then run xen on
top
> > of
> > > that lvm volums !
> > > 
> > > I tried for days now and it isn't working... anyhow, do you see
any
> > > problems why this shouldn't work..
> > > 
> > > Should I create 20 drbd devices and use the drbd helper script for
xen
> > ?
> > > isn't using so many drbd syncs a lot of overhead ? never tried
it...
> > > 
> > > 
> > > xen4 conf # xm create test1.cfg 
> > > Using config file "./test1.cfg".
> > > Error: Device 768 (vbd) could not be connected.
> > > Device /dev/xen3and4/hd23 is mounted in the privileged domain,
> > > 
> > > 
> > > This is what i'm getting right now.. 
> > > /dev/xen3and4/hd23 isn't mounted...
> > > 
> > > 
> > > 
> > > xen4 conf # cat test1.cfg 
> > > 
> > > kernel = "/usr/lib64/xen/boot/hvmloader"
> > > builder = "hvm"
> > > device_model = "/usr/lib64/xen/bin/qemu-dm"
> > > memory = "1024"
> > > maxmem = 2048
> > > maxmemory = 2048
> > > name = "test1"
> > > 
> > > dhcp = "off"
> > > vif = ["type=ioemu, mac=00:16:3e:00:00:20, bridge=xenbr0"]
> > > #cpus = ""
> > > #vcpus = 1 
> > > disk = ["phy:/dev/xen3and4/hd23,ioemu:hda,w" ]
> > > 
> > > serial="pty"
> > > boot="c"
> > > 
> > > vnc=1
> > > vncviewer=0
> > > keymap="de"
> > > vfb = [ "type=vnc, vncpasswd=ssss, vnclisten=0.0.0.0,
vncdisplay=23" ]
> > > sdl=0
> > > 
> > > 
> > > 
> > > since i'm using lvm on top of drbd, xen should'nt be aware of
drbd..
> > > using only lvm it workd...
> > > 
> > > mouting   drbd-lvm2-device works too.... ( only on one site
because i
> > > haven't set up any cluster filesystems.. )
> > > 
> > > 
> > > 
> > > Thanks,
> > > 
> > > Sebastian
> > > 
> > > 
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> 
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