Hi,
I have a backup that worked fine in 5.6 that fails in 5.8 with the 'not enough free space for snapshot error' the DS in question is indeed full, but the disk image in question is independant persistant and therefore not included in snapshots or backups (I can take a standard snapshot of the host without issue)
From the logs:
Prior Disk '2000': file(base):'[DS1] NAS-B/NAS-B.vmdk', backItUp=1
snapshot file:'[DS1] NAS-B/NAS-B.vmdk'
prior size(KB):0, current size(KB):16777216, match=0
prior change block ID:''
Datastore:'DS1' Directly Accessible=1
Prior Disk '2001': file(base):'[DS1] NAS-B/NAS-B_1.vmdk', backItUp=1
snapshot file:'[DS1] NAS-B/NAS-B_1.vmdk'
prior size(KB):0, current size(KB):104857600, match=0
prior change block ID:''
Datastore:'DS1' Directly Accessible=1
Prior Disk '2002': file(base):'[DS1] NAS-B/NAS-B_2.vmdk', backItUp=1
snapshot file:'[DS1] NAS-B/NAS-B_2.vmdk'
prior size(KB):0, current size(KB):10485760, match=0
prior change block ID:''
Datastore:'DS1' Directly Accessible=1
Prior Disk '2003': file(base):'[NAS-B] NAS-B/NAS-B.vmdk', backItUp=0
snapshot file:'[NAS-B] NAS-B/NAS-B.vmdk'
prior size(KB):0, current size(KB):975175680, match=0
prior change block ID:''
Datastore:'NAS-B' Directly Accessible=1
Prior Disk '2004': file(base):'[DS1] NAS-B/NAS-B_3.vmdk', backItUp=1
snapshot file:'[DS1] NAS-B/NAS-B_3.vmdk'
prior size(KB):0, current size(KB):20971520, match=0
prior change block ID:''
Datastore:'DS1' Directly Accessible=1
Prior Disk '2005': file(base):'[DS1] NAS-B/NAS-B_4.vmdk', backItUp=1
snapshot file:'[DS1] NAS-B/NAS-B_4.vmdk'
prior size(KB):0, current size(KB):104857600, match=0
prior change block ID:''
Datastore:'DS1' Directly Accessible=1
Disk 2003 is the one causing the failure, note 'backItUp' is set to false.
Again eveidence that the data on the NAS-B volume is not to be backed up (therefore no snapshot required or indeed requested)
2014-10-10T08:04:30.293-08:00 avvcbimage Info <19660>: targetlist contains <path backup="false" name="[NAS-B] NAS-B/NAS-B.vmdk" diskCapacity="998579896320" />
Data store usage
datastore:'DS1 ' capacity=1999575711744 free=968086257664
datastore:'NAS-B ' capacity=999922073600 free=311427072
So we can agree NAS-B DS is full to capacity (but as noted above that's ok as we don't want to back this up)
However the entire backup then fails based on this:
2014-10-10T08:04:32.430-08:00 avvcbimage Info <19717>: DS(NAS-B) does not have enough free space (311427072 ) for disks used (49928994816).
2014-10-10T08:04:32.430-08:00 avvcbimage Error <19661>: Datastore does not have enough free space for snapshot
2014-10-10T08:04:32.430-08:00 avvcbimage Info <9772>: Starting graceful (staged) termination, failed to create snapshot (wrap-up stage)
Which seems madness seeing as I don't want this backed up anyway! (the volume is Independant Persistant)
I have also tried backing up the invidual disks rather than trying to take an image, exactly the same failure.
Again, this worked fine under 5.6 the only thing that has changed is the version of VDP.
This has got to be a bug, right?
