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Description of problem:

vdsm service fails to start (reasonable) when no space left on disk, however, it alerts nothing about it, and when i start service, it says 'ok', however, whet querying for service status it appears down. 
the problem is that no space left on disk, hence, I suggest to add a test to service when it starts. 

this issue found on rhel6, however, i suppose it exists in previous versions. 

this is important, as when it occurs, log cannot be written, so, no actual info why service doesn't start. 

vdsm 4.9-9-10. 

repro: 

make sure no space left on root partition, and start vdsm

http://post-office.corp.redhat.com/archives/rhev-patches/2010-August/msg00015.html
http://post-office.corp.redhat.com/archives/rhev-patches/2010-August/msg00016.html

verified, tried to start vdsm service with no success, and got the following message: low space [FAILED]


root@silver-vdse ~]# service vdsmd status
VDS daemon is not running
[root@silver-vdse ~]# service vdsmd start
Starting netconsole...
Server address not specified in /etc/sysconfig/netconsole
Starting iscsid: 
vdsm: low log space                                        [FAILED]

2.6.32-63.el6.x86_64
libvirt-0.8.1-25.el6.x86_64
vdsm-4.9-13.el6.x86_64
device-mapper-multipath-0.4.9-25.el6.x86_64
lvm2-2.02.72-7.el6.x86_64
qemu-kvm-0.12.1.2-2.109.el6.x86_64