Thanks for an aswer.
I'm using VDP 5.1.10.32 so I've increased the blackout window. Must I wait to next beginning of the blackout window or can I push garbage collection anyway? I can see it like failed this morning:
505923 2013-12-05 08:15:06 CET ERROR 4202 SYSTEM PROCESS / failed garbage collection with error MSG_ERR_DISKFULL
I'm not sure if "ConnectEMC is not running." error is related to it too. Can I try to start it running "dpnctl start mcs"? I'm not familiar with Avamar too much.