Igor Chubin
2009-Mar-16 14:20 UTC
[Xen-users] Domain sometimes does not migrate completely (an entry with the string "migrating-" remains on the source host)
Hello, all. I have a trouble with live migration of domains. I have a Xen-DRBD cluster with DRBD-devices working over LVM volumes. There are strange situations sometimes. I start live migration of a domain. The domain moves from one host to the other ant continues working there, but the line "migrating-" remains on the source host For example: migrating-dns 13 128 2 ---s-- 0.0 At the same time on the other host: dns 13 128 2 -b---- 0.5 And the domain continues working! I must note that this happens not every migration, but occasionally. In ~20% of cases. The logs are ok. There are no strange entries at all. The host systems are completely identical and rsynced. I use Xen 3.3.1 built from source and PV-kernel version 2.6.18 (installed both in the domain 0 and in the domain U). The same problem exists when using Xen 3.2.1, installed from Debian repositories. But I must note, that that system was installed several years ago, and all was fine until Xen was upgraded to the version 3.2. (So, there was no such a problem with Xen 3.1 !) Did anybody meet something like this? Any ideas how I should get rid of the entry "migrating-dns" in the xm list output (and how I should clean corresponding data structures)? Thank you very much for any ideas, suggestions or any help! -- Igor Chubin _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Igor Chubin
2009-Mar-17 10:24 UTC
Re: [Xen-users] Domain sometimes does not migrate completely (an entry with the string "migrating-" remains on the source host)
On Mo, Mär 16, 2009 at 04:20:48 +0200, Igor Chubin wrote:> > > Hello, all. > > I have a trouble with live migration of domains. > > I have a Xen-DRBD cluster with DRBD-devices working over LVM > volumes. > > > There are strange situations sometimes. > I start live migration of a domain. > The domain moves from one host to the other > ant continues working there, > but the line "migrating-" remains on the source host > > For example: > > migrating-dns 13 128 2 ---s-- 0.0 > > At the same time on the other host: > > dns 13 128 2 -b---- 0.5 > > And the domain continues working! > > > > I must note that this happens not every migration, > but occasionally. In ~20% of cases. > > The logs are ok. There are no strange entries at all.Please, give any hint, how I could increase a debug level to get some additional information, why the domain does not migrate fully. How can I get to know what is it waiting for? -- Igor Chubin _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users