Educause Security Discussion mailing list archives

Re: Vista/7 Shadow Copy


From: Dexter Caldwell <Dexter.Caldwell () FURMAN EDU>
Date: Tue, 25 May 2010 10:10:53 -0400

Sam:
You are correct.  I also understood the question to be more likely focused
on clients However, the most efficient way to turn off VSS on a whole
bunch of machines is to do so administratively.  I just put in the caveat
about servers in case using group policy or some other global management
method was the plan for doing this on a larger scale because it matters at
what level you deploy the change so you don't affect things that do
matter.  You're right though I didn't explain it except to say be sure to
exclude servers.

D/C

Sam Stelfox <SStelfox () vtc vsc edu> writes:
I could be wrong but the original question looks less like a question
about servers and more about clients. I don't see any reason that this
should be on for a normal workstation. Volume Shadow Copy is used to
access files that are currently in use and have a lock (assuming that the
program that is holding the lock supports VSS).

If you are using a backup solution to backup your workstations, even with
VSS disabled the backups should not fail. 

I can't see any reason to keep it enabled on clients/workstations.

On 05/24/2010 04:23 PM, Dexter Caldwell wrote: 

  
Agree. � A number of backup and other products use this service. � Even
some enterprise storage mechanisms leverage it on systems for things like
snapshots or system-state (Active Directory recovery) backups when you
backup Domain Controllers. � It just depends what you have on the back
end. � I'd just be careful about where it's disabled. � (Ex, be sure to
exclude servers, for example) � It's not always obvious what dependencies
exist. � Also apps like SQL Server, Exchange sometimes use this for
various functions, here's an article that's not directly related, but
includes buried in the article some information that describes things
that can be impacted by the service's ability to run properly.

[ http://support.microsoft.com/kb/826936
]http://support.microsoft.com/kb/826936

D/C
The EDUCAUSE Security Constituent Group Listserv <[
mailto:SECURITY () LISTSERV EDUCAUSE EDU ]SECURITY () LISTSERV EDUCAUSE EDU>
writes:
On 5/21/10 3:25 PM, Flynn, Gary wrote:
What do you think of disabling Shadow Copy on computers not having full
disk encryption to prevent inadvertent storage of sensitive data? Our
support folks indicated they don’t use the feature for maintenance or
troubleshooting. Some of our Windows folks are worried that it might be
used as part of the backup process or to recover files from servers
(???). And it it nice to have around when pushing patches or changes
that have higher risk of failure (e.g. Service packs).

At least one major enterprise backup application I'm aware of uses VSS
and backups will fail should that be disabled. You'll have to test your
client machines to see if your client backup process is similarly hobbled.

-- 
Best regards
-- Cal Frye, Network Administrator, Oberlin College
� � Mudd Library, x.56930 -- CIT will NEVER ask you for your password!

� � [ http://www.calfrye.com ]www.calfrye.com, � [
http://www.oberlin.edu/cit/ ]www.oberlin.edu/cit/

"There are two types of power. Organized money and organized people." --
Linda Jeffers.





-- 
Sam Stelfox
Network Administrator
Vermont Technical College




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