Bacula-users

[Bacula-users] concurrent VSS jobs on the same unit

2016-03-03 04:38:49
Subject: [Bacula-users] concurrent VSS jobs on the same unit
From: Davide Giunchi - Diennea <davide.giunchi AT diennea DOT com>
To: "bacula-users AT lists.sourceforge DOT net" <bacula-users AT lists.sourceforge DOT net>
Date: Thu, 3 Mar 2016 09:32:43 +0000
Hi,
If i run two concurrent jobs on the same windows 2012 client with VSS enabled 
on the same windows unit, i get the second job waiting for the first job to 
finish.
It's a VSS related issue, because bacula show the two jobs as "running" but the 
second job is not doing anything. When the first job finish, the second job 
create the vss:

Generate VSS snapshots. Driver="Win64 VSS"
    Snapshot mount point: E:\

and then it really start.

Arno discussed the same problem in 2008 
https://adsm.org/lists/html/Bacula-users/2008-04/msg00140.html
"VSS might prevent that, though. I'm not sure, but I believe it's not  so 
useful to try and create several VSS snapshots of one volume at the  same time."
and in 2014 at the bacula conference 
http://www.baculaconference.org/wp-content/uploads/2014/03/Arno-Lehmann.pdf on 
page 8, about improvements to be made on windows client:
"More than one VSS job concurrently"

So it's a bacula-windows fd limitation and not a windows one?
bacula-fd actually can handle only one vss snapshot at the same time?

Thank you
Regards


Davide Giunchi
IT Executive @ Diennea - MagNews
Viale G.Marconi 30/14 - 48018 Faenza (RA)






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