Error Device 769 Vbd
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top XEN: Error: Device 769 (vbd) could not be connected. Failed to find an unused loop device up vote 2 down vote favorite I'm trying to start a new DomU machine (Lenny) on an Ubuntu Dom0. However, I'm getting the following error when executing the xm-create command: # xm create vm3.rootspirit.com.cfg Using config file "./vm3.rootspirit.com.cfg". Error: Device 769 (vbd) could not be connected. Failed to find an unused loop device After some Googling I learned it was due to limit of loopback devices in /dev # ls -ls /dev/ | grep loop 0 brw-rw---- 1 root disk 7, 0 2009-07-17 04:01 loop0 0 brw-rw---- 1 root disk 7, 1 2009-07-22 12:49 loop1 0 brw-rw---- 1 root disk 7, 2 2009-07-22 12:49 loop2 0 brw-rw---- 1 root disk 7, 3 2009-07-22 12:49 loop3 0 brw-rw---- 1 root disk 7, 4 2009-07-22 12:49 loop4 0 brw-rw---- 1 root disk 7, 5 2009-07-22 12:49 loop5 0 brw-rw---- 1 root disk 7, 6 2009-07-22 12:49 loop6 0 brw-rw---- 1 root disk 7, 7 2009-07-22 12:49 loop7 I currently have 3 DomUs running: # xm list Name ID Mem VCPUs State Time(s) Domain-0 0 5352 2 r----- 945295.5 vm0.rootspirit.com 130 1024 1 -b---- 653791.0 vm1.rootspirit.com 106 1024 2 -b---- 48359.3 vm2.rootspirit.com 128 512 2 -b---- 18150.9 I have added the max_loop option to the loop module # cat /etc/modules | grep loop loop max_loop=64 But I am unable to reload the module # modprobe -r loop FATAL: Module loop is in use. I am unable destroy all the DomUs and/or to reboot the Dom0 at this time. Any other way to reload/force the use of extra loop devices? Thanks, Yeri debian xen loopback share|improve this question asked Oct 19 '10 at 13:09 Tuinslak 67731541 I ended up killing all my DomU VMs, edited /etc/modprobe.d/local-loop.conf and added: options loop max_loop=64; modprobe -r loop && modprobe loop, restart all DomUs, and it worked. –Tuinslak Oct 19 '10 at 23:42 add a commen
To: stephan.augustin@xxxxxx Subject: Re: [Xen-users] Error: Device 769 (vbd) could not be connected. Backend device not found. From: Molle Bestefich Date: Tue, 31 Jan 2006 13:32:41 +0100 Cc: xen-users@xxxxxxxxxxxxxxxxxxx Delivery-date: Tue, 31 Jan 2006 https://serverfault.com/questions/192478/xen-error-device-769-vbd-could-not-be-connected-failed-to-find-an-unused-lo/263977 12:42:40 +0000 Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=I8mseYTw9Z5F3hhVOQ7YEpbVdsLv6BSPyhBTF9c4D8UqX3hEzOADF2UFybKg3FPyZKBVtF43vISv5ZEaom49geD4207IyzgnSgHxSUK9IixIqwZ/YE3rXkNquBLWgYouJUaty4/M0sakgnrJ2Zjv3w3FrXcpYqTzcXGrlpBrj7w= Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx In-reply-to: <200601311219.57937.michael.mey@xxxxxx> List-help: List-id: Xen user discussion List-post: List-subscribe: , List-unsubscribe: , References: <200601301555.58845.stephan.augustin@xxxxxx> <200601310914.57990.stephan.augustin@xxxxxx> <200601311219.57937.michael.mey@xxxxxx> http://old-list-archives.xenproject.org/xen-users/2006-01/msg01267.html Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx Michael Mey wrote: > Stephan Augustin wrote: > > I have figured out that if it happens all loop-devices are fully used. can > > i get more of them ? > > AFAIK you can set the number of loopback devices in your kernel config. Thus > you have to recompile your xen-kernel. That may be true, but it's much easier to adjust it on the kernel command line. Just add max_loop=128 or some such. _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users [Morewiththissubject...] [Xen-users] Error: Device 769 (vbd) could not be connected. Backend devic
769 (vbd) could not be connected. Backend device not found. To: xen-users@xxxxxxxxxxxxxxxxxxx From: Stephan Augustin Date: Mon, 30 Jan 2006 22:50:20 +0100 Cc: Tony Clark , Molle Bestefich Delivery-date: Tue, 31 https://lists.xen.org/archives/html/xen-users/2006-01/msg01256.html Jan 2006 11:13:56 +0000 List-id: Xen user discussion Hi, I tried some times again, and now i am running 7 machines concurrent. during installation, the same error occured, but this was because i hadn't mounted the image-file partition at this time. the only difference i can see is that i now didnt use the dom0_mem=64000 parameter in the grub/menu.lst config. perhaps it was error device this , I dont know. if someone knows more about, please tell me thank you for your fast help stephan Am Montag, 30. Januar 2006 21:01 schrieb Tony Clark: > I also see this with the disks mounted as LVM partitions and not using > loopbacks. It happens for me off the first or second DomU instance, > seemingly at random. > > Sorry error device 769 I have no info on a fix though; just thought I'd feed in my > experience that's not related to loopback devices. > > Tony > > On 31/01/2006, at 5:23 AM, Molle Bestefich wrote: > > Stephan Augustin wrote: > >> When I try to start the 5.th Guest-Domain, I Get the following error: > >> > >> Error: Device 769 (vbd) could not be connected. Backend device not > >> found. > > > > Seems a lot of people are having this problem. > > Should be in the FAQ, and the error message should be clearer. > > > > I have no clue where or how to fix the error message, however. > > > > I can take a wild guess at why you might be seeing it though - have > > you run out of loop devices in dom0? > > > > HTH > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@xxxxxxxxxxxxxxxxxxx > > http://lists.xensource.com/xen-users > > tony clark > director - tony.clark@xxxxxxxxxx > --------------------------------------------------------------- > rising sun pictures - www.rsp.com.au > redefining visual effects delivery > -----