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[Xen-devel] Automatic loopback dev with 'whole disk' stored in file

To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Automatic loopback dev with 'whole disk' stored in file
From: Stephen Childs <Stephen.Childs@xxxxxxxxx>
Date: Thu, 28 Oct 2004 12:47:41 +0100
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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


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