Hello Completely new xen(er) here, and I know little about virtualization. I have installed and have running xen 3.1.0 on my Debian 4.0R5 server. I have built my domains, but I have noted that it stops at 4 Is there a way to increase the number of domains (virtual machines) I can run on a single server. I really would like 7. Regards Fred _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Fred Zinsli
2008-Dec-02 02:53 UTC
Re: [Xen-users] Increasing the number of virtual machines
After some conciderable research I have now found out that xen doesn''t (can''t) meet my requirements. Regards Fred -----Original Message----- From: "Fred Zinsli" <fred.zinsli@shooter.co.nz> To: xen-users@lists.xensource.com Date: Tue, 02 Dec 2008 07:20:25 +1300 Subject: [Xen-users] Increasing the number of virtual machines> Hello > > Completely new xen(er) here, and I know little about virtualization. > > I have installed and have running xen 3.1.0 on my Debian 4.0R5 server. > > I have built my domains, but I have noted that it stops at 4 > > Is there a way to increase the number of domains (virtual machines) I > can > run on a single server. I really would like 7. > > Regards > > Fred > > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
You must be doing your research in Chinese, since I have some servers with over 30 domains, and the server is less than 10% busy. I believe that you can have way over 100 VM''s in a good server. Mine has 128 GB of RAM and 1 TB of space. -----Original Message----- From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Fred Zinsli Sent: Monday, December 01, 2008 9:53 PM To: xen-users@lists.xensource.com Subject: Re: [Xen-users] Increasing the number of virtual machines After some conciderable research I have now found out that xen doesn''t (can''t) meet my requirements. Regards Fred -----Original Message----- From: "Fred Zinsli" <fred.zinsli@shooter.co.nz> To: xen-users@lists.xensource.com Date: Tue, 02 Dec 2008 07:20:25 +1300 Subject: [Xen-users] Increasing the number of virtual machines> Hello > > Completely new xen(er) here, and I know little about virtualization. > > I have installed and have running xen 3.1.0 on my Debian 4.0R5 server. > > I have built my domains, but I have noted that it stops at 4 > > Is there a way to increase the number of domains (virtual machines) I > can > run on a single server. I really would like 7. > > Regards > > Fred > > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Fred Zinsli
2008-Dec-02 07:18 UTC
RE: [Xen-users] Increasing the number of virtual machines
I have googled like mad and I still can''t find the information I need to resolve this. Would you care to enlighten me a little as to where I can find the information I need. Regards Fred -----Original Message----- From: "Venefax" <venefax@gmail.com> To: <fred.zinsli@shooter.co.nz>, <xen-users@lists.xensource.com> Cc: Date: Mon, 1 Dec 2008 21:55:15 -0500 Subject: RE: [Xen-users] Increasing the number of virtual machines> You must be doing your research in Chinese, since I have some servers > with > over 30 domains, and the server is less than 10% busy. I believe that > you > can have way over 100 VM''s in a good server. Mine has 128 GB of RAM and > 1 TB > of space. > > > -----Original Message----- > From: xen-users-bounces@lists.xensource.com > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Fred Zinsli > Sent: Monday, December 01, 2008 9:53 PM > To: xen-users@lists.xensource.com > Subject: Re: [Xen-users] Increasing the number of virtual machines > > After some conciderable research I have now found out that xen doesn''t > (can''t) meet my requirements. > > Regards > > Fred > > -----Original Message----- > From: "Fred Zinsli" <fred.zinsli@shooter.co.nz> > To: xen-users@lists.xensource.com > Date: Tue, 02 Dec 2008 07:20:25 +1300 > Subject: [Xen-users] Increasing the number of virtual machines > > > Hello > > > > Completely new xen(er) here, and I know little about virtualization. > > > > I have installed and have running xen 3.1.0 on my Debian 4.0R5 > server. > > > > I have built my domains, but I have noted that it stops at 4 > > > > Is there a way to increase the number of domains (virtual machines) I > > can > > run on a single server. I really would like 7. > > > > Regards > > > > Fred > > > > > > > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Dirk H. Schulz
2008-Dec-02 07:38 UTC
RE: [Xen-users] Increasing the number of virtual machines
Fred, what exactly means "it stops at 4"? Are there errors? What does happen if you start a fifth domain? Dirk --On 2. Dezember 2008 20:18:19 +1300 Fred Zinsli <fred.zinsli@shooter.co.nz> wrote:> I have googled like mad and I still can''t find the information I need to > resolve this. > > Would you care to enlighten me a little as to where I can find the > information I need. > > Regards > > Fred > > -----Original Message----- > From: "Venefax" <venefax@gmail.com> > To: <fred.zinsli@shooter.co.nz>, <xen-users@lists.xensource.com> > Cc: > Date: Mon, 1 Dec 2008 21:55:15 -0500 > Subject: RE: [Xen-users] Increasing the number of virtual machines > >> You must be doing your research in Chinese, since I have some servers >> with >> over 30 domains, and the server is less than 10% busy. I believe that >> you >> can have way over 100 VM''s in a good server. Mine has 128 GB of RAM and >> 1 TB >> of space. >> >> >> -----Original Message----- >> From: xen-users-bounces@lists.xensource.com >> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Fred Zinsli >> Sent: Monday, December 01, 2008 9:53 PM >> To: xen-users@lists.xensource.com >> Subject: Re: [Xen-users] Increasing the number of virtual machines >> >> After some conciderable research I have now found out that xen doesn''t >> (can''t) meet my requirements. >> >> Regards >> >> Fred >> >> -----Original Message----- >> From: "Fred Zinsli" <fred.zinsli@shooter.co.nz> >> To: xen-users@lists.xensource.com >> Date: Tue, 02 Dec 2008 07:20:25 +1300 >> Subject: [Xen-users] Increasing the number of virtual machines >> >> > Hello >> > >> > Completely new xen(er) here, and I know little about virtualization. >> > >> > I have installed and have running xen 3.1.0 on my Debian 4.0R5 >> server. >> > >> > I have built my domains, but I have noted that it stops at 4 >> > >> > Is there a way to increase the number of domains (virtual machines) I >> > can >> > run on a single server. I really would like 7. >> > >> > Regards >> > >> > Fred >> > >> > >> > >> > >> > _______________________________________________ >> > Xen-users mailing list >> > Xen-users@lists.xensource.com >> > http://lists.xensource.com/xen-users >> >> >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xensource.com >> http://lists.xensource.com/xen-users >> >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xensource.com >> http://lists.xensource.com/xen-users > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Maresa Nirwan
2008-Dec-02 07:42 UTC
RE: [Xen-users] Increasing the number of virtual machines
I got a rather small server with 8GB memory and 120GB disk. I''m running 8 DomUs without problems ... There''s no special configuration. Just have a bunch of DomUs cfg files and do xm create on them all (or do it automatically). I''m not sure about Xen, (I think VMWare allows VMs memory to total greater than physical memory), but you may want to check the total memory of your DomUs. If the total memory is greater than your physical memory, that may be the issue. Also, is there error messages thrown when you''re starting the 5th DomU? Thanks, MSN> Date: Tue, 2 Dec 2008 20:18:19 +1300 > From: fred.zinsli@shooter.co.nz > To: xen-users@lists.xensource.com > Subject: RE: [Xen-users] Increasing the number of virtual machines > > I have googled like mad and I still can''t find the information I need to > resolve this. > > Would you care to enlighten me a little as to where I can find the > information I need. > > Regards > > Fred > > -----Original Message----- > From: "Venefax" <venefax@gmail.com> > To: <fred.zinsli@shooter.co.nz>, <xen-users@lists.xensource.com> > Cc: > Date: Mon, 1 Dec 2008 21:55:15 -0500 > Subject: RE: [Xen-users] Increasing the number of virtual machines > > > You must be doing your research in Chinese, since I have some servers > > with > > over 30 domains, and the server is less than 10% busy. I believe that > > you > > can have way over 100 VM''s in a good server. Mine has 128 GB of RAM and > > 1 TB > > of space. > > > > > > -----Original Message----- > > From: xen-users-bounces@lists.xensource.com > > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Fred Zinsli > > Sent: Monday, December 01, 2008 9:53 PM > > To: xen-users@lists.xensource.com > > Subject: Re: [Xen-users] Increasing the number of virtual machines > > > > After some conciderable research I have now found out that xen doesn''t > > (can''t) meet my requirements. > > > > Regards > > > > Fred > > > > -----Original Message----- > > From: "Fred Zinsli" <fred.zinsli@shooter.co.nz> > > To: xen-users@lists.xensource.com > > Date: Tue, 02 Dec 2008 07:20:25 +1300 > > Subject: [Xen-users] Increasing the number of virtual machines > > > > > Hello > > > > > > Completely new xen(er) here, and I know little about virtualization. > > > > > > I have installed and have running xen 3.1.0 on my Debian 4.0R5 > > server. > > > > > > I have built my domains, but I have noted that it stops at 4 > > > > > > Is there a way to increase the number of domains (virtual machines) I > > > can > > > run on a single server. I really would like 7. > > > > > > Regards > > > > > > Fred > > > > > > > > > > > > > > > _______________________________________________ > > > Xen-users mailing list > > > Xen-users@lists.xensource.com > > > http://lists.xensource.com/xen-users > > > > > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Barry BURNEREAU
2008-Dec-02 07:49 UTC
Re: [Xen-users] Increasing the number of virtual machines
It look likes a loop problem Try to add something like "options loop max_loop=64" in /etc/modprobe.conf Barry 2008/12/2 Maresa Nirwan <parampat@hotmail.com>> I got a rather small server with 8GB memory and 120GB disk. I''m running 8 > DomUs without problems ... There''s no special configuration. Just have a > bunch of DomUs cfg files and do xm create on them all (or do it > automatically). > > I''m not sure about Xen, (I think VMWare allows VMs memory to total greater > than physical memory), but you may want to check the total memory of your > DomUs. If the total memory is greater than your physical memory, that may be > the issue. > > Also, is there error messages thrown when you''re starting the 5th DomU? > > Thanks, > MSN > > > Date: Tue, 2 Dec 2008 20:18:19 +1300 > > From: fred.zinsli@shooter.co.nz > > To: xen-users@lists.xensource.com > > Subject: RE: [Xen-users] Increasing the number of virtual machines > > > > I have googled like mad and I still can''t find the information I need to > > resolve this. > > > > Would you care to enlighten me a little as to where I can find the > > information I need. > > > > Regards > > > > Fred > > > > -----Original Message----- > > From: "Venefax" <venefax@gmail.com> > > To: <fred.zinsli@shooter.co.nz>, <xen-users@lists.xensource.com> > > Cc: > > Date: Mon, 1 Dec 2008 21:55:15 -0500 > > Subject: RE: [Xen-users] Increasing the number of virtual machines > > > > > You must be doing your research in Chinese, since I have some servers > > > with > > > over 30 domains, and the server is less than 10% busy. I believe that > > > you > > > can have way over 100 VM''s in a good server. Mine has 128 GB of RAM and > > > 1 TB > > > of space. > > > > > > > > > -----Original Message----- > > > From: xen-users-bounces@lists.xensource.com > > > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Fred > Zinsli > > > Sent: Monday, December 01, 2008 9:53 PM > > > To: xen-users@lists.xensource.com > > > Subject: Re: [Xen-users] Increasing the number of virtual machines > > > > > > After some conciderable research I have now found out that xen doesn''t > > > (can''t) meet my requirements. > > > > > > Regards > > > > > > Fred > > > > > > -----Original Message----- > > > From: "Fred Zinsli" <fred.zinsli@shooter.co.nz> > > > To: xen-users@lists.xensource.com > > > Date: Tue, 02 Dec 2008 07:20:25 +1300 > > > Subject: [Xen-users] Increasing the number of virtual machines > > > > > > > Hello > > > > > > > > Completely new xen(er) here, and I know little about virtualization. > > > > > > > > I have installed and have running xen 3.1.0 on my Debian 4.0R5 > > > server. > > > > > > > > I have built my domains, but I have noted that it stops at 4 > > > > > > > > Is there a way to increase the number of domains (virtual machines) I > > > > can > > > > run on a single server. I really would like 7. > > > > > > > > Regards > > > > > > > > Fred > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > Xen-users mailing list > > > > Xen-users@lists.xensource.com > > > > http://lists.xensource.com/xen-users > > > > > > > > > > > > _______________________________________________ > > > Xen-users mailing list > > > Xen-users@lists.xensource.com > > > http://lists.xensource.com/xen-users > > > > > > > > > _______________________________________________ > > > Xen-users mailing list > > > Xen-users@lists.xensource.com > > > http://lists.xensource.com/xen-users > > > > > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Fred Zinsli
2008-Dec-02 08:28 UTC
RE: [Xen-users] Increasing the number of virtual machines
All of the doms create without error. I can start them all in the normal way. No errors When I do xm list I only see the first 4 doms I created. I can ping only the first 4 doms I created. I can only enter the console of the first 4 doms I created. I have used this howto as a starting point for my solution. http://www.howtoforge.com/perfect_setup_xen3_debian There are no errors generated to the screen or log files that I can find. Regards Fred -----Original Message----- From: "Dirk H. Schulz" <dirk.schulz@kinzesberg.de> To: xen-users@lists.xensource.com Date: Tue, 02 Dec 2008 08:38:18 +0100 Subject: RE: [Xen-users] Increasing the number of virtual machines> Fred, > > what exactly means "it stops at 4"? Are there errors? What does happen > if > you start a fifth domain? > > Dirk > > --On 2. Dezember 2008 20:18:19 +1300 Fred Zinsli > <fred.zinsli@shooter.co.nz> wrote: > > > I have googled like mad and I still can''t find the information I need > to > > resolve this. > > > > Would you care to enlighten me a little as to where I can find the > > information I need. > > > > Regards > > > > Fred > > > > -----Original Message----- > > From: "Venefax" <venefax@gmail.com> > > To: <fred.zinsli@shooter.co.nz>, <xen-users@lists.xensource.com> > > Cc: > > Date: Mon, 1 Dec 2008 21:55:15 -0500 > > Subject: RE: [Xen-users] Increasing the number of virtual machines > > > >> You must be doing your research in Chinese, since I have some > servers > >> with > >> over 30 domains, and the server is less than 10% busy. I believe > that > >> you > >> can have way over 100 VM''s in a good server. Mine has 128 GB of RAM > and > >> 1 TB > >> of space. > >> > >> > >> -----Original Message----- > >> From: xen-users-bounces@lists.xensource.com > >> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Fred > Zinsli > >> Sent: Monday, December 01, 2008 9:53 PM > >> To: xen-users@lists.xensource.com > >> Subject: Re: [Xen-users] Increasing the number of virtual machines > >> > >> After some conciderable research I have now found out that xen > doesn''t > >> (can''t) meet my requirements. > >> > >> Regards > >> > >> Fred > >> > >> -----Original Message----- > >> From: "Fred Zinsli" <fred.zinsli@shooter.co.nz> > >> To: xen-users@lists.xensource.com > >> Date: Tue, 02 Dec 2008 07:20:25 +1300 > >> Subject: [Xen-users] Increasing the number of virtual machines > >> > >> > Hello > >> > > >> > Completely new xen(er) here, and I know little about > virtualization. > >> > > >> > I have installed and have running xen 3.1.0 on my Debian 4.0R5 > >> server. > >> > > >> > I have built my domains, but I have noted that it stops at 4 > >> > > >> > Is there a way to increase the number of domains (virtual > machines) I > >> > can > >> > run on a single server. I really would like 7. > >> > > >> > Regards > >> > > >> > Fred > >> > > >> > > >> > > >> > > >> > _______________________________________________ > >> > Xen-users mailing list > >> > Xen-users@lists.xensource.com > >> > http://lists.xensource.com/xen-users > >> > >> > >> > >> _______________________________________________ > >> Xen-users mailing list > >> Xen-users@lists.xensource.com > >> http://lists.xensource.com/xen-users > >> > >> > >> _______________________________________________ > >> Xen-users mailing list > >> Xen-users@lists.xensource.com > >> http://lists.xensource.com/xen-users > > > > > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
James Harper
2008-Dec-02 09:21 UTC
RE: [Xen-users] Increasing the number of virtual machines
> All of the doms create without error. > I can start them all in the normal way. No errors > When I do xm list I only see the first 4 doms I created. > I can ping only the first 4 doms I created. > I can only enter the console of the first 4 doms I created. > > I have used this howto as a starting point for my solution. > http://www.howtoforge.com/perfect_setup_xen3_debian > > There are no errors generated to the screen or log files that I canfind.>As someone else pointed out, 4 is the default limit for the number of loop devices (loop makes a block device out of a file), and your domain will use one for every file: device in every domain, which may or may not be your problem. If loop is a module, stop all of your domains, ''rmmod loop'', then ''modprobe loop max_loop=32'', then see how many you can start. If that fixes it, then edit your modules config to always load loop with max_loop=32 James _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Fred Zinsli
2008-Dec-02 21:18 UTC
RE: [Xen-users] Increasing the number of virtual machines
With the aid of comments here, and some help in #debian (IRC) I have found out that the kernel I was using for my xen host was compiled without loop support and hence it would never see more than 4 doms. I didn''t compile my own kernel as I don''t have that experience, and getting to grips with virtualization on its own is proving to be a big enough task. Many thanks for the comments and advice. I am now setting up my doms again on the rebuilt server and I will see how that tests. Regards Fred -----Original Message----- From: "James Harper" <james.harper@bendigoit.com.au> To: <fred.zinsli@shooter.co.nz>, <xen-users@lists.xensource.com> Cc: Date: Tue, 2 Dec 2008 20:21:39 +1100 Subject: RE: [Xen-users] Increasing the number of virtual machines> > All of the doms create without error. > > I can start them all in the normal way. No errors > > When I do xm list I only see the first 4 doms I created. > > I can ping only the first 4 doms I created. > > I can only enter the console of the first 4 doms I created. > > > > I have used this howto as a starting point for my solution. > > http://www.howtoforge.com/perfect_setup_xen3_debian > > > > There are no errors generated to the screen or log files that I can > find. > > > > As someone else pointed out, 4 is the default limit for the number of > loop devices (loop makes a block device out of a file), and your domain > will use one for every file: device in every domain, which may or may > not be your problem. > > If loop is a module, stop all of your domains, ''rmmod loop'', then > ''modprobe loop max_loop=32'', then see how many you can start. If that > fixes it, then edit your modules config to always load loop with > max_loop=32 > > James > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Stephen Liu
2008-Dec-03 02:46 UTC
RE: [Xen-users] Increasing the number of virtual machines
--- Fred Zinsli <fred.zinsli@shooter.co.nz> wrote:> With the aid of comments here, and some help in #debian (IRC) I have > found > out that the kernel I was using for my xen host was compiled without > loop > support and hence it would never see more than 4 doms. I didn''t > compile my > own kernel as I don''t have that experience, and getting to grips with > virtualization on its own is proving to be a big enough task. > > Many thanks for the comments and advice. > > I am now setting up my doms again on the rebuilt server and I will > see how > that tests. > > RegardsHi Fred, Please try on menu.lst of the host; # cat /boot/grub/menu.lst ..... title Xen 3.1.0 / Debian GNU/Linux, kernel 2.6.18-xen root (hd0,0) kernel /boot/xen-3.1.0.gz module /boot/vmlinuz-2.6.18-xen root=/dev/sda1 ro console=tty0 max_loop=64 module /boot/initrd.img-2.6.18-xen savedefault ..... Add "max_loop=64" to the end of the line "module ...." as above. Restart the PC. Then you can run at lease 30 guests simultaneously if the loop is NOT run by other devices. HTH B.R. Stephen L> > -----Original Message----- > From: "James Harper" <james.harper@bendigoit.com.au> > To: <fred.zinsli@shooter.co.nz>, <xen-users@lists.xensource.com> > Cc: > Date: Tue, 2 Dec 2008 20:21:39 +1100 > Subject: RE: [Xen-users] Increasing the number of virtual machines > > > > All of the doms create without error. > > > I can start them all in the normal way. No errors > > > When I do xm list I only see the first 4 doms I created. > > > I can ping only the first 4 doms I created. > > > I can only enter the console of the first 4 doms I created. > > > > > > I have used this howto as a starting point for my solution. > > > http://www.howtoforge.com/perfect_setup_xen3_debian > > > > > > There are no errors generated to the screen or log files that I > can > > find. > > > > > > > As someone else pointed out, 4 is the default limit for the number > of > > loop devices (loop makes a block device out of a file), and your > domain > > will use one for every file: device in every domain, which may or > may > > not be your problem. > > > > If loop is a module, stop all of your domains, ''rmmod loop'', then > > ''modprobe loop max_loop=32'', then see how many you can start. If > that > > fixes it, then edit your modules config to always load loop with > > max_loop=32 > > > > James > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >Send instant messages to your online friends http://uk.messenger.yahoo.com _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users