Stephen Childs
2004-Oct-28 11:42 UTC
[Xen-devel] Automatic loopback dev with ''whole disk'' stored in file
I am (finally) porting my setup code to use the automatic loopback disk=''file:/blah'' stuff rather than setting up the loopback devices myself. This doesn''t seem to work when the file is backing a whole ''device'' rather than just a partition hosting a filesystem? (i.e. the file actually contains partitions which then hold filesystems) I get the following error on the command line: # xm create name=cagnode89 disk=file:/var/xen-grid/cagnode89/fs/vdisk,hda1,w ip=134.226.53.153 root=/dev/hda2 Using config file "/etc/xen/xmdefconfig". Error: Error creating domain: [Errno 4] Interrupted system call and this in xend.log: [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:720) init_domain> Created domain=9 name=cagnode89 memory=200 [2004-10-28 12:39:52 xend] INFO (console:94) Created console id=12 domain=9 port=9609 [2004-10-28 12:39:52 xend] DEBUG (blkif:115) Connecting blkif <BlkifBackendInterface 9 0> [2004-10-28 12:39:52 xend] INFO (XendRoot:91) EVENT> xend.console.create [12, 9, 9609] [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:1082) Creating vbd dom=9 uname=file:/var/xen-grid/cagnode89/fs/vdisk [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:674) Destroying vbds for domain 9 [2004-10-28 12:39:52 xend] DEBUG (blkif:501) Destroying blkif domain=9 [2004-10-28 12:39:52 xend] DEBUG (blkif:357) Destroying vbd domain=9 idx=0 [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:634) Closing console, domain 9 [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:622) Closing channel to domain 9 If I do the losetup manually and then use phy:loop0 then it still works fine. Maybe I should move over to using one file per partition as that seems to be what is being tested most. Is it just me who thinks it''s quite nice to have the whole disk, partitions and all, stored in a single file? Stephen -- Dr. Stephen Childs, Research Fellow, EGEE Project, phone: +353-1-6081797 Computer Architecture Group, email: Stephen.Childs @ cs.tcd.ie Trinity College Dublin, Ireland web: http://www.cs.tcd.ie/Stephen.Childs ------------------------------------------------------- This Newsletter Sponsored by: Macrovision For reliable Linux application installations, use the industry''s leading setup authoring tool, InstallShield X. Learn more and evaluate today. http://clk.atdmt.com/MSI/go/ins0030000001msi/direct/01/ _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Stephen Childs
2004-Oct-28 11:47 UTC
[Xen-devel] Automatic loopback dev with ''whole disk'' stored in file
I am (finally) porting my setup code to use the automatic loopback disk=''file:/blah'' stuff rather than setting up the loopback devices myself. This doesn''t seem to work when the file is backing a whole ''device'' rather than just a partition hosting a filesystem? (i.e. the file actually contains partitions which then hold filesystems) I get the following error on the command line: # xm create name=cagnode89 disk=file:/var/xen-grid/cagnode89/fs/vdisk,hda1,w ip=134.226.53.153 root=/dev/hda2 Using config file "/etc/xen/xmdefconfig". Error: Error creating domain: [Errno 4] Interrupted system call and this in xend.log: [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:720) init_domain> Created domain=9 name=cagnode89 memory=200 [2004-10-28 12:39:52 xend] INFO (console:94) Created console id=12 domain=9 port=9609 [2004-10-28 12:39:52 xend] DEBUG (blkif:115) Connecting blkif <BlkifBackendInterface 9 0> [2004-10-28 12:39:52 xend] INFO (XendRoot:91) EVENT> xend.console.create [12, 9, 9609] [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:1082) Creating vbd dom=9 uname=file:/var/xen-grid/cagnode89/fs/vdisk [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:674) Destroying vbds for domain 9 [2004-10-28 12:39:52 xend] DEBUG (blkif:501) Destroying blkif domain=9 [2004-10-28 12:39:52 xend] DEBUG (blkif:357) Destroying vbd domain=9 idx=0 [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:634) Closing console, domain 9 [2004-10-28 12:39:52 xend] DEBUG (XendDomainInfo:622) Closing channel to domain 9 If I do the losetup manually and then use phy:loop0 then it still works fine. Maybe I should move over to using one file per partition as that seems to be what is being tested most. Is it just me who thinks it''s quite nice to have the whole disk, partitions and all, stored in a single file? Stephen ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader''s Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Ian Pratt
2004-Oct-28 12:49 UTC
Re: [Xen-devel] Automatic loopback dev with ''whole disk'' stored in file
> I am (finally) porting my setup code to use the automatic loopback > disk=''file:/blah'' stuff rather than setting up the loopback devices myself. > This doesn''t seem to work when the file is backing a whole ''device'' rather > than just a partition hosting a filesystem? (i.e. the file actually contains > partitions which then hold filesystems)I don''t believe the standard loop back device supports whole device. Are you using the NASA enhanced loop back device patch? I guess you''d need to use this patch in domain 0 to populate the file in the first place. The other domains won''t care. However, It''s not immediately obvious to me why the standard script that handles setting up loopback devices cares whether you''re exporting partitions or a whole disk. Any reason not to have a file per partition? (Unless you want to let your domains partition their ''disk'' however they see fit.) Ian ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader''s Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel