As I said, it's not necessarily a disk space issue.
But it is harder to find if it isn't :(

It can also be a RAM issue, even if it would appear that there's plenty of free 
memory left.
Some kernel and driver parts of windows allocate a fixed pool of memory at 
boot, and can't grow that later.

The high part of the error code won't be of much help here either, 7 is 
'facility_win32', which means that a win32 API call failed. Could hardly be 
more generic.


I can only suggest that you google for the error code, see if anything comes up 
that resembles the symptoms you get, and then check the conditions more deeply 
and see if they apply in your case...

Maybe a good place to start: there is a thread about this error, related to VSS 
but with EMC instead of Bacula, at backup central.
http://www.backupcentral.com/phpBB2/two-way-mirrors-of-external-mailing-lists-3/emc-networker-19/64bit-win-client-fails-with-vss-errors-100397/
A couple of answers near the bottom of the page give solutions that "worked for 
them".



-----Original Message-----
From: global16 [mailto:bacula-forum AT backupcentral DOT com] 
Sent: 21 April 2015 19:19
To: bacula-users AT lists.sourceforge DOT net
Subject: [Bacula-users] Shadow Copy issue - Fatal error: VssOject is NULL

(From: global16 [mailto:bacula-forum < at > backupcentral.com] )
On the client, these entries are logged in C:\Program 
Files\Bacula\working\zhfs01.trace
fs01: vss_generic.cpp:366-0 VSSClientGeneric::Initialize: CoInitialize returned 
0x80070008

Is one of the server's disks full or nearing its capacity?
0x80070008 means "Not enough storage is available to process this command."
This message does not always indicate a lack of disk space, but that is the 
first thing to check if you get it. 
------------------------------------------------------------------------------------------------------------------------------

Thanks for the tips Luc Van der Veken, unfortunately I don't see disk space as 
being an issue.  The 'E' volume on the client is only 60% used with over 500GB 
of free space.  The destination storage pool also has plenty of space free.  It 
is strange that if I reboot the client server, backups with VSS will succeed 
for a few days and then start failing again...

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