Hi,
I finally found a solution for my problem.
I still do not know, what the exact problem was. The symptoms
are, that the xen dom0, Domain-0 does not start and that e.g.
xm asks, if xend is running, but xend is in the process list.
>> # xm list
>> Error: Unable to connect to xend: No such file or directory. Is xend
>> running?
The xend.log file reports error messages like
> RuntimeError: (28, 'No space left on device, while writing
/vm/00000000-0000-0000-0000-
> 000000000000/xend/restart_count : 0')
but every device and memory has plenty space available.
The system is a openSUSE 10.2 on 2 processor XEON 64bit machine
with 4Gbyte RAM. XEN is build from source xen-3.0.4_1
To workaround and to get xen back again I just
removed the directories /var/lib/xen, /var/lib/xend
and /var/lib/xenstored.
In /var/lib/xen/save was 1 Gbyte file named like the only
guest virtual machine I am running on the host:
/var/lib/xen/save/vm01
This is propably a memory image of the guest vm and I believe
that the existance of this file was the cause of the trouble.
There are a few other threads unanswered in the net, which maybe
solved the same way. Here are some of the subjects I found with google:
[Fedora-xen] Xen0 not booting into Login console
[Fedora-xen] Exception when starting xend: error while reading
/vm/00000000-0000-0000-0000-000000000000/ssidref
Sincerelly,
Oli
Oliver Heil wrote:
Hi XEN Users and Developers,
xend does not start into a clean state. The process is running...
#ps -efl | grep xen
1 S root 20 19 0 70 -5 - 0 xenwat Mar06 ?
00:00:00 [xenwatch]
1 S root 21 19 0 70 -5 - 0 xb_rea Mar06 ?
00:00:00 [xenbus]
5 S root 12663 1 0 76 0 - 1274 - 09:56 ?
00:00:00 xenstored --pid-file /var/run/xenstore.pid
5 S root 12667 1 0 84 0 - 3552 stext 09:56 ?
00:00:00 xenconsoled
1 S root 12671 1 0 79 0 - 13265 wait 09:56 ?
00:00:00 python /usr/sbin/xend start
5 S root 12673 12671 0 76 0 - 15412 184466 09:56 ?
00:00:00 python /usr/sbin/xend start
...but no virtual machine can be started and xm answers e.g with this:
# xm list
Error: Unable to connect to xend: No such file or directory. Is xend
running?
In the xend.log there is the following error:
[2007-03-07 09:56:13 xend 12659] WARNING (XendAuthSessions:27)
python-pam is required for XenAPI support.
[2007-03-07 09:56:13 xend 12673] INFO (SrvDaemon:322) Xend Daemon started
[2007-03-07 09:56:13 xend 12673] INFO (SrvDaemon:326) Xend changeset:
unavailable.
[2007-03-07 09:56:13 xend 12673] INFO (SrvDaemon:333) Xend version:
Unknown.
[2007-03-07 09:56:13 xend.XendDomainInfo 12673] DEBUG
(XendDomainInfo:121) XendDomainInfo.recreate({'max_vcpu_id': 3,
'cpu_time': 11
74593321820L, 'ssidref': 0, 'hvm': 0, 'shutdown_reason': 0, 'dying':
0, 'online_vcpus': 4, 'domid': 0, 'paused': 0, 'crashed': 0, 'r
unning': 1, 'maxmem_kb': 17179869180, 'shutdown': 0, 'mem_kb':
3985144, 'handle': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
'blocked': 0, 'name': 'Domain-0'})
[2007-03-07 09:56:13 xend.XendDomainInfo 12673] INFO
(XendDomainInfo:135) Recreating domain 0, UUID
00000000-0000-0000-0000-00000000
0000. at /local/domain/0
[2007-03-07 09:56:13 xend.XendDomainInfo 12673] WARNING
(XendDomainInfo:149) /local/domain/0/vm is missing. recreate is
confused, tr
ying our best to recover
[2007-03-07 09:56:13 xend.XendDomainInfo 12673] DEBUG
(XendDomainInfo:1714) Storing VM details: {'on_xend_stop': 'ignore',
'shadow_m
emory': '0', 'uuid': '00000000-0000-0000-0000-000000000000', 'name':
'Domain-0', 'on_reboot': 'restart', 'on_poweroff': 'destroy', '
on_xend_start': 'ignore', 'on_crash': 'restart', 'xend/restart_count':
'0', 'vcpus': '4', 'vcpu_avail': '15', 'memory': '3892', 'max
mem': '16777216'}
[2007-03-07 09:56:13 xend 12673] ERROR (SrvDaemon:344) Exception
starting xend ((28, 'No space left on device, while writing /vm/000
00000-0000-0000-0000-000000000000/xend/restart_count : 0'))
Traceback (most recent call last):
File "//usr/lib64/python/xen/xend/server/SrvDaemon.py", line 336, in
run
servers = SrvServer.create()
File "//usr/lib64/python/xen/xend/server/SrvServer.py", line 226, in
create
root.putChild('xend', SrvRoot())
File "//usr/lib64/python/xen/xend/server/SrvRoot.py", line 40, in
__init__
self.get(name)
File "//usr/lib64/python/xen/web/SrvDir.py", line 82, in get
val = val.getobj()
File "//usr/lib64/python/xen/web/SrvDir.py", line 52, in getobj
self.obj = klassobj()
File "//usr/lib64/python/xen/xend/server/SrvDomainDir.py", line 41,
in __init__
self.xd = XendDomain.instance()
File "//usr/lib64/python/xen/xend/XendDomain.py", line 1399, in
instance
inst.init()
File "//usr/lib64/python/xen/xend/XendDomain.py", line 116, in init
dom0 = XendDomainInfo.recreate(dom0info, True)
File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 174, in
recreate
vm._storeVmDetails()
File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 1716, in
_storeVmDetails
self._writeVm(to_store)
File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 672, in
_writeVm
return xstransact.Write(self.vmpath, *args)
File "//usr/lib64/python/xen/xend/xenstore/xstransact.py", line 302,
in Write
complete(path, lambda t: t.write(*args))
File "//usr/lib64/python/xen/xend/xenstore/xstransact.py", line 354,
in complete
result = f(t)
File "//usr/lib64/python/xen/xend/xenstore/xstransact.py", line 302,
in <lambda>
complete(path, lambda t: t.write(*args))
File "//usr/lib64/python/xen/xend/xenstore/xstransact.py", line 87,
in write
self._write(key, d[key])
File "//usr/lib64/python/xen/xend/xenstore/xstransact.py", line 75,
in _write
('%s, while writing %s : %s' %
RuntimeError: (28, 'No space left on device, while writing
/vm/00000000-0000-0000-0000-000000000000/xend/restart_count : 0')
[2007-03-07 09:56:13 xend 12675] WARNING (XendAuthSessions:27)
python-pam is required for XenAPI support.
Does somebody know a cure for this behaviour?
With regards,
Oli
--
/////////////////////////////////
Oliver Heil
DKFZ - Deutsches Krebsforschungszentrum
Im Neuenheimer Feld 515
69120 Heidelberg
Tel (+49 6221) / 42 4708
Email o.heil@xxxxxxx
WWW www.dkfz.de
/////////////////////////////////
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