Solved

I want to enable SHADOW COPIES on Windows 2008r2 and need advice

Posted on 2013-01-17
2
1,816 Views
Last Modified: 2013-02-02
I would like to enable shadow copies on our main File Share. The file share is made up of two file servers that are part of a DFS. I am concerned about space and performance. Both my file servers have 1.39TB D drives that I share with DFS. Both servers have 460GB of free space at this time. All the DFS replication works fine, but if a user looses a file I need to go back to backups to restore a simple excel or word doc. I am hoping to offer shadow copies.  I see where I right click the D drive and "enable shadow copies". It looks like the default limits are about 10% of the actual drive size. I am assuming it is best to use limits. Is it possible for me to just enable this for say once a week to get thing started, so I can get the feel of how it works and watch what it does to my disk space? Do I just enable Shadow copies for the D drive and modify SETTINGS and check only one day of the week. What will this do to my drive space. Does it sound like I have sufficient space with only 460GB of 1.39TB available?
0
Comment
Question by:Thor2923
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 10

Accepted Solution

by:
rscottvan earned 250 total points
ID: 38789845
Everything you stated makes sense...

As far as having enough space, it really depends how much data changes how quickly.  Shadow Copies are pretty efficient, so I think you're likely fine.  (They only keep block level changes, so if only a few bytes in a file change, that's all it tracks.)

I would recommend setting it to run once daily, then see how much disk is free on day 2, then day 3.  I'm guessing your free space will only shrink by a couple percent per day.  That just means you would be able to hang on to about 5 to 10 days worth of changes.

Increasing the frequency of the snapshots doesn't necessarily increase the disk needed - it all depends how fast the files change.  In most of the cases I've done this, only a small fraction of the files change on any given day (less than 1%).  You will just have to experiment to tune it, but as long as its limited to 10% of the disk, there's little risk to you.  Any length of retention is better than you have now ;)
0
 
LVL 31

Assisted Solution

by:Henrik Johansson
Henrik Johansson earned 250 total points
ID: 38789849
To avoid I/O burst issues, shadow copy snapshots should be placed on separate disk with 16KB cluster size NTFS. I've seen the shadow copy area be complete wiped earlier on our own file servers due to I/O burst when we had VSS area on same disk as the user data..

http://technet.microsoft.com/en-us/library/cc728305(v=ws.10).aspx
0

Featured Post

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I was prompted to write this article after the recent World-Wide Ransomware outbreak. For years now, System Administrators around the world have used the excuse of "Waiting a Bit" before applying Security Patch Updates. This type of reasoning to me …
After seeing many questions for JRNL_WRAP_ERROR for replication failure, I thought it would be useful to write this article.
This tutorial will show how to configure a single USB drive with a separate folder for each day of the week. This will allow each of the backups to be kept separate preventing the previous day’s backup from being overwritten. The USB drive must be s…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …

690 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question