20 steps to decommission a redundant information middle facility
Decommissioning a redundant facility is a tougher activity than shutting down a standalone operation. Study the suitable steps to take to get the job performed safely and reliably.
It was with a component of disappointment that I lately participated within the decommissioning of a distant web site from our world atmosphere. This web site had been in operation almost 14 years, and I helped construct it out and preserve it.
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Because the web site was redundant, this meant that we might be shutting down the bodily and digital servers there in addition to the networking gear, however leaving infrastructural parts similar to Lively Listing, DNS, consumer and group accounts and so forth in place as these would stay in our different lively areas.
This made the location decommission a bit trickier than one I labored on beforehand; a standalone, single facility that was closing (the enterprise was shutting its doorways) and thus it was only a matter of turning out the lights on the finish of the month. Right here is the define of the steps we took; be aware that some will even apply to standalone websites however I wished to current your entire course of from A to Z. This course of assumes you will have already construct a brand new functioning web site and that Lively Listing is in place (skip these steps if in any other case).
1. Set the timeline and accountable events
Doc a listing of milestones as to what’s going to happen when and issue within the planning course of itself. This could define an inexpensive timeframe as to when the next steps ought to happen and determine who ought to be concerned and what roles and duties they possess.
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2. Assess stock
Get a listing of each server (bodily and digital) that might be shut down. Add to the listing all of the community gadgets: switches, routers, VPN gadgets, wi-fi entry factors and different associated parts. Embody printers, scanners, badge readers—something with a serial quantity. You will not solely want this to find out what’s really going away, however seemingly it is going to turn out to be useful when making an attempt to promote, donate or recycle the gear.
3. Organize to terminate any third-party vendor contracts
Notify all distributors about what’s taking place, and if you want service or help minimize off. It is in all probability a good suggestion to schedule this for a few days or per week after the anticipated shutdown simply in case.
4. Guarantee vital assets are relocated elsewhere
This is among the extra necessary steps. Within the instance of the location I simply shut down, the 2 area controllers have been holding the FSMO roles for Lively Listing. And whereas they have been additionally DNS servers, redundant DNS servers existed within the remaining websites. I transferred these FSMO roles over to servers that may stay intact. We additionally had software servers in these websites that may take over for the soon-to-be-defunct servers and in reality had constructed a completely new web site to switch it.
5. Plan the shutdown so as
Utilizing your stock listing from step 1, decide what order to close techniques and gadgets down. Work from low worth to vital worth—as an illustration, area controllers and DNS servers are seemingly the third to final techniques to be powered off, with the second to final ones being any ESX hypervisors adopted by the community gadgets. Do not put your self in a state of affairs the place a high-value system was powered off earlier than a low-value one and now you have misplaced entry to get to one thing.
6. Notify finish customers about what to anticipate
Ship out emails explaining what is occurring and why, when it is going to happen and what customers ought to do beforehand and after (if relevant). Embody all milestone dates and phone data to which they’ll direct any questions or considerations.
Now we get to the precise web site decommission steps.
7. Take away gadgets from monitoring
Earlier than you even log in to any of the techniques to be shut down, take them out of any monitoring matrix they’re in. This may forestall you from receiving and having to cope with a slew of vital alerts that there’s a large outage underway.
8. Take away gadgets from backups
This is similar because the final step; take the techniques you might be decommissioning out of any backup rotations. Maintain the present backups till they age out per their current schedule, nevertheless (it may also be sensible to maintain one archive backup).
9. Shut down non-essential bodily servers
Both log in to the servers straight or by way of any management interface (similar to Dell iDRAC) and energy off the lower-value servers.
10. Shut down non-essential digital servers
Both log into the servers straight or by way of any management interface (similar to VMWare vSphere) and energy off the lower-value servers.
11. Take away Lively Listing and DNS from DCs
At this level your area controllers ought to be the final remaining servers standing. Watch out with this step as a result of should you full this after which discover one other system it’s essential entry or log in to, you would possibly end up unable to take action with these two key infrastructural parts gone.
A phrase of warning: First examine the zone transfers tab on all ahead and reverse DNS zones for each area controller to make sure these servers weren’t the one ones performing zone transfers to different servers as you will seemingly run into title decision issues down the road.
This step includes launching Server Supervisor (all Home windows server variations since 2008), clicking Handle, selecting Take away Roles and Options, after which continuing to uncheck the choices for Lively Listing Area Companies and DNS Server and clicking via the prompts to take away them. You will be requested if you would like to Demote This Area Controller in one of many dialogue containers and given a hyperlink to take action.
There may be additionally a PowerShell methodology you’ll be able to analysis.
If this includes a baby area which is site-specific, if you take away AD from the final area controller within the web site it’s best to click on the checkbox on one of many dialogue containers that that is the Final Area Controller within the Area. This may properly clear issues up for you and nuke the area so the opposite websites will not see that youngster area any longer.
12. Take away out of date objects from AD Customers and Computer systems
Delete all decommissioned servers from the area controllers within the remaining web site(s) together with the defunct area controllers.
13. Take away out of date websites/subnets from AD Websites and Companies
14. Take away out of date DNS zones
SEE: Energy guidelines: Native e mail server-to-cloud migration (TechRepublic Premium)
15. Shut down the hypervisors
16. Shut down storage arrays
17. Shut down community gadgets
18. Take away firewall objects and guidelines
Take away all these pertaining to the defunct web site from the remaining reside websites (the place relevant).
19. Organize safe disposal of all gear
Make certain to erase any onerous drives.
20. Ship a last notification to finish customers that the work is full
Set expectations/suggestions for something they should know or do going ahead.