How to increase loop device

[satimis]

Hi folks,


Debian Etch - host and guest.


I'm only allowed running 6 domUs simulataneously.  On starting the 7th
domU it complains;

$ sudo xm create /etc/xen/xen7.satimis.com.cfg
Using config file "/etc/xen/xen7.satimis.com.cfg".
Error: Device 769 (vbd) could not be connected. Failed to find an
unused loop device.


$ ls /dev/loop/*
/dev/loop/0


Please advise how to fix the problem.  TIA


B.R.
Stephen L

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[Dominik Vogt-2]

Each guest uses at least two loop devices. Modify or
create /etc/modprobe.d/local-loop and add this line:

options loop max_loop=64

With 64 loop devices you can run up to 32 guests on your host, assuming
you aren't using loop devices for any other purposes.

cheers

Am Donnerstag, den 25.09.2008, 14:37 +0800 schrieb Stephen Liu:

> Hi folks,
>
>
> Debian Etch - host and guest.
>
>
> I'm only allowed running 6 domUs simulataneously.  On starting the 7th
> domU it complains;
>
> $ sudo xm create /etc/xen/xen7.satimis.com.cfg
> Using config file "/etc/xen/xen7.satimis.com.cfg".
> Error: Device 769 (vbd) could not be connected. Failed to find an
> unused loop device.
>
>
> $ ls /dev/loop/*
> /dev/loop/0
>
>
> Please advise how to fix the problem.  TIA
>
>
> B.R.
> Stephen L
>
> Send instant messages to your online friends http://uk.messenger.yahoo.com 
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@...
> http://lists.xensource.com/xen-users

--

Dominik Vogt
Informatikbetreuer
Universität Bern
Institut für medizinische Lehre (IML)
Abteilung für Assessment und Evaluation (AAE)
Inselspital 37a
CH-3010 Bern

Phone: [phone]
Mail: dominik.vogt@...


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[satimis]

--- Dominik Vogt <dominik.vogt@...> wrote:

> Each guest uses at least two loop devices. Modify or
> create /etc/modprobe.d/local-loop and add this line:
>
> options loop max_loop=64


Hi Dominik,


Thanks for your advice.


I don't have this file on /etc/modprobe.d/

$ locate local-loop
No printout


Where can I find this file?  TIA


B.R.
Stephen

>
> With 64 loop devices you can run up to 32 guests on your host,
> assuming
> you aren't using loop devices for any other purposes.
>
> cheers
>
> Am Donnerstag, den 25.09.2008, 14:37 +0800 schrieb Stephen Liu:
> > Hi folks,
> >
> >
> > Debian Etch - host and guest.
> >
> >
> > I'm only allowed running 6 domUs simulataneously.  On starting the
> 7th
> > domU it complains;
> >
> > $ sudo xm create /etc/xen/xen7.satimis.com.cfg
> > Using config file "/etc/xen/xen7.satimis.com.cfg".
> > Error: Device 769 (vbd) could not be connected. Failed to find an
> > unused loop device.
> >
> >
> > $ ls /dev/loop/*
> > /dev/loop/0
> >
> >
> > Please advise how to fix the problem.  TIA
> >
> >
> > B.R.
> > Stephen L
> >
> > Send instant messages to your online friends
> http://uk.messenger.yahoo.com 
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@...
> > http://lists.xensource.com/xen-users
> --
> Dominik Vogt
> Informatikbetreuer
> Universität Bern
> Institut für medizinische Lehre (IML)
> Abteilung für Assessment und Evaluation (AAE)
> Inselspital 37a
> CH-3010 Bern
>
> Phone: [phone]
> Mail: dominik.vogt@...
>

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[Dominik Vogt-2]

Am Donnerstag, den 25.09.2008, 15:05 +0800 schrieb Stephen Liu:
> --- Dominik Vogt <dominik.vogt@...> wrote:

>
> I don't have this file on /etc/modprobe.d/

So you have to create it :-) you can also name the file "xen" or what
ever. After this you just have to do

rmmod loop
modprobe loop

cheers

> B.R.
> Stephen
>
>
> >
> > With 64 loop devices you can run up to 32 guests on your host,
> > assuming
> > you aren't using loop devices for any other purposes.
> >
> > cheers
> >
> > Am Donnerstag, den 25.09.2008, 14:37 +0800 schrieb Stephen Liu:
> > > Hi folks,
> > >
> > >
> > > Debian Etch - host and guest.
> > >
> > >
> > > I'm only allowed running 6 domUs simulataneously.  On starting the
> > 7th
> > > domU it complains;
> > >
> > > $ sudo xm create /etc/xen/xen7.satimis.com.cfg
> > > Using config file "/etc/xen/xen7.satimis.com.cfg".
> > > Error: Device 769 (vbd) could not be connected. Failed to find an
> > > unused loop device.
> > >
> > >
> > > $ ls /dev/loop/*
> > > /dev/loop/0
> > >
> > >
> > > Please advise how to fix the problem.  TIA
> > >
> > >
> > > B.R.
> > > Stephen L
> > >
> > > Send instant messages to your online friends
> > http://uk.messenger.yahoo.com 
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@...
> > > http://lists.xensource.com/xen-users
> > --
> > Dominik Vogt
> > Informatikbetreuer
> > Universität Bern
> > Institut für medizinische Lehre (IML)
> > Abteilung für Assessment und Evaluation (AAE)
> > Inselspital 37a
> > CH-3010 Bern
> >
> > Phone: [phone]
> > Mail: dominik.vogt@...
> >
>
>
> Send instant messages to your online friends http://uk.messenger.yahoo.com 
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@...
> http://lists.xensource.com/xen-users

--

Dominik Vogt
Informatikbetreuer
Universität Bern
Institut für medizinische Lehre (IML)
Abteilung für Assessment und Evaluation (AAE)
Inselspital 37a
CH-3010 Bern

Phone: [phone]
Mail: dominik.vogt@...


_______________________________________________
Xen-users mailing list
Xen-users@...
http://lists.xensource.com/xen-users

[satimis]

--- Dominik Vogt <dominik.vogt@...> wrote:

> Am Donnerstag, den 25.09.2008, 15:05 +0800 schrieb Stephen Liu:
> > --- Dominik Vogt <dominik.vogt@...> wrote:
>
> >
> > I don't have this file on /etc/modprobe.d/
>
> So you have to create it :-) you can also name the file "xen" or what
> ever. After this you just have to do
>
> rmmod loop
> modprobe loop

Performed following steps;


# vi /etc/modprobe.d/xen
adding following line;
options loop max_loop=64


# rmmod -v loop
ERROR: Module loop does not exist in /proc/modules


# modprobe loop
FATAL: Module loop not found.


# grep -i loop /boot/config-`uname -r`
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_CRYPTOLOOP=m
CONFIG_XEN_NETDEV_LOOPBACK=y


loop is not a module.  What can I do?  TIA


B.R.
Stephen L

> > >
> > > With 64 loop devices you can run up to 32 guests on your host,
> > > assuming
> > > you aren't using loop devices for any other purposes.
> > >
> > > cheers
> > >
> > > Am Donnerstag, den 25.09.2008, 14:37 +0800 schrieb Stephen Liu:
> > > > Hi folks,
> > > >
> > > >
> > > > Debian Etch - host and guest.
> > > >
> > > >
> > > > I'm only allowed running 6 domUs simulataneously.  On starting
> the
> > > 7th
> > > > domU it complains;
> > > >
> > > > $ sudo xm create /etc/xen/xen7.satimis.com.cfg
> > > > Using config file "/etc/xen/xen7.satimis.com.cfg".
> > > > Error: Device 769 (vbd) could not be connected. Failed to find
> an
> > > > unused loop device.
> > > >
> > > >
> > > > $ ls /dev/loop/*
> > > > /dev/loop/0
> > > >
> > > >
> > > > Please advise how to fix the problem.  TIA
> > > >
> > > >
> > > > B.R.
> > > > Stephen L
> > > >
> > > > Send instant messages to your online friends
> > > http://uk.messenger.yahoo.com 
> > > >
> > > > _______________________________________________
> > > > Xen-users mailing list
> > > > Xen-users@...
> > > > http://lists.xensource.com/xen-users
> > > --
> > > Dominik Vogt
> > > Informatikbetreuer
> > > Universität Bern
> > > Institut für medizinische Lehre (IML)
> > > Abteilung für Assessment und Evaluation (AAE)
> > > Inselspital 37a
> > > CH-3010 Bern
> > >
> > > Phone: [phone]
> > > Mail: dominik.vogt@...
> > >
> >
> >
> > Send instant messages to your online friends
> http://uk.messenger.yahoo.com 
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@...
> > http://lists.xensource.com/xen-users
> --
> Dominik Vogt
> Informatikbetreuer
> Universität Bern
> Institut für medizinische Lehre (IML)
> Abteilung für Assessment und Evaluation (AAE)
> Inselspital 37a
> CH-3010 Bern
>
> Phone: [phone]
> Mail: dominik.vogt@...
>

Send instant messages to your online friends http://uk.messenger.yahoo.com 

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[satimis]

--- Boris Quiroz <borisq22@...> wrote:

> 2008/9/25 Stephen Liu <satimis@...>:
> >
> > --- Dominik Vogt <dominik.vogt@...> wrote:
> >
> >> Am Donnerstag, den 25.09.2008, 15:05 +0800 schrieb Stephen Liu:
> >> > --- Dominik Vogt <dominik.vogt@...> wrote:
> >>
> >> >
> >> > I don't have this file on /etc/modprobe.d/
> >>
> >> So you have to create it :-) you can also name the file "xen" or
> what
> >> ever. After this you just have to do
> >>
> >> rmmod loop
> >> modprobe loop
> >
> >
> > Performed following steps;
> >
> >
> > # vi /etc/modprobe.d/xen
> > adding following line;
> > options loop max_loop=64
> >
> >
> > # rmmod -v loop
> > ERROR: Module loop does not exist in /proc/modules
> >
> >
> > # modprobe loop
> > FATAL: Module loop not found.
> >
> >
> > # grep -i loop /boot/config-`uname -r`
> > CONFIG_BLK_DEV_LOOP=y
> > CONFIG_BLK_DEV_CRYPTOLOOP=m
> > CONFIG_XEN_NETDEV_LOOPBACK=y
> >
> >
> > loop is not a module.  What can I do?  TIA
> >
> >
> > B.R.
> > Stephen L
> >
> >
> >> > >
> >> > > With 64 loop devices you can run up to 32 guests on your host,
> >> > > assuming
> >> > > you aren't using loop devices for any other purposes.
> >> > >

- snip -

>
> If you're using a debian-based distro, the file you're looking for
> uis
> /etc/modules
> There you must add the line loop max_loop=64 and then load the
> module.
>
> cheers.


Hi Boris,


Thanks for your advice.


Debian Etch


Performed following steps.


# vi /etc/modules
There is only one word "loop" there.

changing it as;

loop max_loop=64


# modprobe modules
FATAL: Module modules not found.


# modprobe /etc/modules
FATAL: Module /etc/modules not found.


# depmod -a
# modprobe modules
FATAL: Module modules not found.


# insmod modules
insmod: can't read 'modules': No such file or directory


# insmod /etc/modules
insmod: error inserting '/etc/modules': -1 Invalid module format


Reboot PC.  


# /etc/init.d/module-init-tools restart
Loading kernel modules...done.


Still can't solve the problem.  Only 4 domU can be started.


# xm create /etc/xen/xen5.satimis.com.cfg
Using config file "/etc/xen/xen5.satimis.com.cfg".
Error: Device 770 (vbd) could not be connected. Failed to find an
unused loop device


B.R.
Stephen L

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[Jean-Michel Bonnefond]

I think you could pass it as an option to your kernel at boot time, if you use grub, add
 max_loop=64
at the end of your kernel line, then reboot the server and look how much devices are declared in /dev/loop*

JM.

2008/9/25 Stephen Liu <satimis@...>

--- Dominik Vogt <dominik.vogt@...> wrote:

> Am Donnerstag, den 25.09.2008, 15:05 +0800 schrieb Stephen Liu:
> > --- Dominik Vogt <dominik.vogt@...> wrote:
>
> >
> > I don't have this file on /etc/modprobe.d/
>
> So you have to create it :-) you can also name the file "xen" or what
> ever. After this you just have to do
>
> rmmod loop
> modprobe loop

Performed following steps;


# vi /etc/modprobe.d/xen
adding following line;

options loop max_loop=64

# rmmod -v loop
ERROR: Module loop does not exist in /proc/modules


# modprobe loop
FATAL: Module loop not found.


# grep -i loop /boot/config-`uname -r`
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_CRYPTOLOOP=m
CONFIG_XEN_NETDEV_LOOPBACK=y


loop is not a module.  What can I do?  TIA

B.R.
Stephen L


> > >
> > > With 64 loop devices you can run up to 32 guests on your host,
> > > assuming
> > > you aren't using loop devices for any other purposes.
> > >
> > > cheers
> > >
> > > Am Donnerstag, den 25.09.2008, 14:37 +0800 schrieb Stephen Liu:
> > > > Hi folks,
> > > >
> > > >
> > > > Debian Etch - host and guest.
> > > >
> > > >
> > > > I'm only allowed running 6 domUs simulataneously.  On starting
> the
> > > 7th
> > > > domU it complains;
> > > >
> > > > $ sudo xm create /etc/xen/xen7.satimis.com.cfg
> > > > Using config file "/etc/xen/xen7.satimis.com.cfg".
> > > > Error: Device 769 (vbd) could not be connected. Failed to find
> an
> > > > unused loop device.
> > > >
> > > >
> > > > $ ls /dev/loop/*
> > > > /dev/loop/0
> > > >
> > > >
> > > > Please advise how to fix the problem.  TIA
> > > >
> > > >
> > > > B.R.
> > > > Stephen L
> > > >
> > > > Send instant messages to your online friends
> > > http://uk.messenger.yahoo.com
> > > >
> > > > _______________________________________________
> > > > Xen-users mailing list
> > > > Xen-users@...
> > > > http://lists.xensource.com/xen-users
> > > --
> > > Dominik Vogt
> > > Informatikbetreuer
> > > Universität Bern
> > > Institut für medizinische Lehre (IML)
> > > Abteilung für Assessment und Evaluation (AAE)
> > > Inselspital 37a
> > > CH-3010 Bern
> > >
> > > Phone: [phone]
> > > Mail: dominik.vogt@...
> > >
> >
> >
> > Send instant messages to your online friends
> http://uk.messenger.yahoo.com
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@...
> > http://lists.xensource.com/xen-users
> --
> Dominik Vogt
> Informatikbetreuer
> Universität Bern
> Institut für medizinische Lehre (IML)
> Abteilung für Assessment und Evaluation (AAE)
> Inselspital 37a
> CH-3010 Bern
>
> Phone: [phone]
> Mail: dominik.vogt@...
>


Send instant messages to your online friends http://uk.messenger.yahoo.com

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[satimis]

--- Jean-Michel Bonnefond <pompon2@...> wrote:

> I think you could pass it as an option to your kernel at boot time,
> if you
> use grub, add
>  max_loop=64
> at the end of your kernel line, then reboot the server and look how
> much
> devices are declared in /dev/loop*
>
> JM.


Hi Jean-Michel,


Thanks for your advice.  It works for me.


Steps performed as follows;


1)
Re-edit /etc/modules
reverting the content to its original state.


2)
Reboot PC


At boot on the menu press "e" -> highlight kernal line, then pressing
'e" again -> adding max_loop=64 at the end of the line -> Enter ->
press "b" to boot.


$ ls /dev/ | grep loop
loop0
...
...
loop63


Approx how many domUs can be run concurrently on an AMD Dual-Core
2.6GHz PC with 4G Ram on board?  All servers are headless,  TIA


B.R.
Stephen

>
> 2008/9/25 Stephen Liu <satimis@...>
>
> >
> > --- Dominik Vogt <dominik.vogt@...> wrote:
> >
> > > Am Donnerstag, den 25.09.2008, 15:05 +0800 schrieb Stephen Liu:
> > > > --- Dominik Vogt <dominik.vogt@...> wrote:
> > >
> > > >
> > > > I don't have this file on /etc/modprobe.d/
> > >
> > > So you have to create it :-) you can also name the file "xen" or
> what
> > > ever. After this you just have to do
> > >
> > > rmmod loop
> > > modprobe loop
> >
> >
> > Performed following steps;
> >
> >
> > # vi /etc/modprobe.d/xen
> > adding following line;
> > options loop max_loop=64
> >
> >
> > # rmmod -v loop
> > ERROR: Module loop does not exist in /proc/modules
> >
> >
> > # modprobe loop
> > FATAL: Module loop not found.
> >
> >
> > # grep -i loop /boot/config-`uname -r`
> > CONFIG_BLK_DEV_LOOP=y
> > CONFIG_BLK_DEV_CRYPTOLOOP=m
> > CONFIG_XEN_NETDEV_LOOPBACK=y
> >
> >
> > loop is not a module.  What can I do?  TIA
> >
> >
> > B.R.
> > Stephen L
> >
> >
> > > > >
> > > > > With 64 loop devices you can run up to 32 guests on your
> host,
> > > > > assuming
> > > > > you aren't using loop devices for any other purposes.
> > > > >
> > > > > cheers
> > > > >
> > > > > Am Donnerstag, den 25.09.2008, 14:37 +0800 schrieb Stephen
> Liu:
> > > > > > Hi folks,
> > > > > >
> > > > > >
> > > > > > Debian Etch - host and guest.
> > > > > >
> > > > > >
> > > > > > I'm only allowed running 6 domUs simulataneously.  On
> starting
> > > the
> > > > > 7th
> > > > > > domU it complains;
> > > > > >
> > > > > > $ sudo xm create /etc/xen/xen7.satimis.com.cfg
> > > > > > Using config file "/etc/xen/xen7.satimis.com.cfg".
> > > > > > Error: Device 769 (vbd) could not be connected. Failed to
> find
> > > an
> > > > > > unused loop device.
> > > > > >
> > > > > >
> > > > > > $ ls /dev/loop/*
> > > > > > /dev/loop/0
> > > > > >
> > > > > >
> > > > > > Please advise how to fix the problem.  TIA
> > > > > >
> > > > > >
> > > > > > B.R.
> > > > > > Stephen L
> > > > > >
> > > > > > Send instant messages to your online friends
> > > > > http://uk.messenger.yahoo.com
> > > > > >
> > > > > > _______________________________________________
> > > > > > Xen-users mailing list
> > > > > > Xen-users@...
> > > > > > http://lists.xensource.com/xen-users
> > > > > --
> > > > > Dominik Vogt
> > > > > Informatikbetreuer
> > > > > Universität Bern
> > > > > Institut für medizinische Lehre (IML)
> > > > > Abteilung für Assessment und Evaluation (AAE)
> > > > > Inselspital 37a
> > > > > CH-3010 Bern
> > > > >
> > > > > Phone: [phone]
> > > > > Mail: dominik.vogt@...
> > > > >
> > > >
> > > >
> > > > Send instant messages to your online friends
> > > http://uk.messenger.yahoo.com
> > > >
> > > > _______________________________________________
> > > > Xen-users mailing list
> > > > Xen-users@...
> > > > http://lists.xensource.com/xen-users
> > > --
> > > Dominik Vogt
> > > Informatikbetreuer
> > > Universität Bern
> > > Institut für medizinische Lehre (IML)
> > > Abteilung für Assessment und Evaluation (AAE)
> > > Inselspital 37a
> > > CH-3010 Bern
> > >
> > > Phone: [phone]
> > > Mail: dominik.vogt@...
> > >
> >
> >
> > Send instant messages to your online friends
> http://uk.messenger.yahoo.com
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@...
> > http://lists.xensource.com/xen-users
> >
>

Send instant messages to your online friends http://uk.messenger.yahoo.com 

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