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Can't perform backup

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I'm facing odd issue. I can't perform backup - neither from web UI nor from termina. I get following error when I try to do it:

Code:

cman_tool: Cannot open connection to cman, is it running ?root@ds0371:~/dump# vzdump --dumpdir /root/dump/ 301
unable to parse worker upid 'UPID:ds0371:00023136:1001D7AE5:5201EC1A:vzdump::root@pam:'
root@ds0371:~/dump# pvecm status
cman_tool: Cannot open connection to cman, is it running ?
root@ds0371:~/dump# service cman start
root@ds0371:~/dump#

When I try to start cman from WebUI I get similar error:
Code:

starting worker failed: unable to parse worker upid 'UPID:ds0371:000232ED:1001D9E34:5201EC75:srvstart:corosync:root@pam:' (500)
I've updated libpve-common-perl (1.0-49) (as per bug https://bugzilla.proxmox.com/show_bug.cgi?id=172) but to no avail.

Any ideas how to solve that?

EDIT: actually I can't perform any action - neither stop nor start any VM...

Some time ago I've run out of space on the root partition (10% of the whole drive) -- could this be the cause of the errors?

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