Solved

DNS server aging and scavenging

Posted on 2014-09-17
2
333 Views
Last Modified: 2014-09-19
I'm reading a technet article ( http://technet.microsoft.com/en-us/library/cc759204(v=ws.10).aspx ), but still being confused.

Looking at below screenshots, I set automatic scavenging period as 7 days for the server. What exactly does it means? If it means it scavenges stale records every 7 days, from what date and time? and how can I reset the date and time to start?

I tried to disable and enable this setting  to see if this changes the date and time shown on 'This zone can be scavenged after' on Zone property, but it doesn't change this value at all. If then, now I'm confused for this too, where this date and time came from?

The left screen is DNS server property and the right screen is Zone property.
dns prop
0
Comment
Question by:crcsupport
2 Comments
 
LVL 56

Accepted Solution

by:
Cliff Galiher earned 250 total points
ID: 40329219
My suggestion is don't overthink this. It wasn't meant to be granularly controlled. Like background disk defrag in the newest versions of windows, they give you a time so you can make sure it won't conflict with other maintenance window tasks... mostly backups. And it gives you the "every x days" control so you can customize this based on the number of records that get generated. A system that sees hundreds or thousands of unique devices a day, such as a hotel with public WiFi, will want to scavenge more often than a small business. So let's Sao you decide, based on record creation volume, you want to scavenge every 7 days. It won't matter if that process happens to run every Sunday or every Wednesday. It is only going to scavenge records that are old based on your aging settings. Trying to get mere granular provides ZERO benefit. So they didn't bother to create a GUI for it.

From a purely technical perspective, I believe the counter starts from the time the service starts. So usually it'll be x days (where x is the day count you choose) from the last reboot.
0
 
LVL 39

Assisted Solution

by:footech
footech earned 250 total points
ID: 40329698
I pretty much agree with what Cliff said.

The best article for understanding scavenging that I've come across is:
http://blogs.technet.com/b/networking/archive/2008/03/19/don-t-be-afraid-of-dns-scavenging-just-be-patient.aspx
(I've referenced it so many times it's ridiculous).

One portion in particular that directly answers your question -
"When you first set scavenging on a zone the timestamp seen at the bottom (reload zone if you don't see it) will be set to the current time of day rounded down to the nearest hour plus the Refresh interval.  This also gets reset any time the zone is loaded or any time dynamic updates get enabled on the zone."
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

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

The reason that corporations and businesses use Windows servers is because it supports custom modifications to adapt to the business and what it needs. Most individual users won’t need such powerful options. Here I’ll explain how you can enable Wind…
You might have come across a situation when you have Exchange 2013 server in two different sites (Production and DR). After adding the Database copy in ECP console it displays Database copy status unknown for the DR exchange server. Issue is strange…
This tutorial will walk an individual through the process of installing the necessary services and then configuring a Windows Server 2012 system as an iSCSI target. To install the necessary roles, go to Server Manager, and select Add Roles and Featu…
This tutorial will walk an individual through the process of configuring their Windows Server 2012 domain controller to synchronize its time with a trusted, external resource. Use Google, Bing, or other preferred search engine to locate trusted NTP …

911 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

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now