Mirroring 2 NTFS Hard Disks under Win2k

Posted on 2001-06-24
Medium Priority
Last Modified: 2010-04-11
Dear all,

Here's the issue;

I am trying to create data redundancy under win2k server.
i have two identical hard disks converted into dynamic volumes and  both partitioned into C and D.

under win2k i am able to mirror the D partitions but i have tried almost everything to mirror the C but i keep getting messages like" Drives upgrade to dynamic volumes from basic disks cannot be mirrored " 

Please tell me how i can mirror both my C and D partitions successfully so that if one hard disk fails , the server can still boot/ function from the other hard disk.

Question by:pandav

Expert Comment

ID: 6224101
That message is correct.  I don't think you can use Microsoft's Windows based mirroring to mirror your bootable drive with Windows installed on it.  You see you can not mirror drives upgraded to dynamic because Windows needs to reformat the volumes and and then start mirroring.  to do that it would wipe out your OS and then where would you be.  Remember this is software redundancy so there is a couple of catches like this one.  I would recommend getting a ATA-Raid controller card, they work very well and are under $100.  If you have EIDE disks this is definitely the way to go.

Author Comment

ID: 6271637
Jwalsh, Thanx for the comment, nut i have read books that say you can mirror both partitions on  a hard disk to another , inclusive of C:


Expert Comment

ID: 6271755
well those books have to be wrong.  I should have been more definite in my answer.  I am basically positive that you can not mirror your boot drive unless it's done at a hardware level, outside of the Operating System.  Windows is handling the mirror and the point of a mirror is to recover if the master drive fails.  If you "boot" master drive fails, you will not be able to fail over to the backup mirrored drive because that is not a boot drive.  believe me there is no way for that to work unless it's done at a hardware level independant of the Operating System.
What Kind of Coding Program is Right for You?

There are many ways to learn to code these days. From coding bootcamps like Flatiron School to online courses to totally free beginner resources. The best way to learn to code depends on many factors, but the most important one is you. See what course is best for you.


Accepted Solution

rcasteel earned 400 total points
ID: 6336614
The books are correct.  But they don't address the particular problem you are having.  You CAN mirror ANY partition under windows 2000.  There are a few rules though.  1) The secondary partition must have at least as much free space as the primary partition of the mirror. 2) to use ANY kind of software RAID under Windows 2000 the disks must be Dynamics disk NOt BASIC.  3) In order to mirror the partitions, they have to be NATIVE DYNAMIC disks...they cannot be converted...I know this sucks but that is just the way it is.

jwalsh is not correct about mirroring the OS...in fact that is the only way under Windows 2000 to provide a fault tolerant system and boot partition in software RAID.  It works fine...all you have to do in the event of a failure is pull out your trusty Fault Tolerant Boot Floppy and select the secondary system partition and it will boot fine.  If the FTBF is bad, you can simply mark the secondary partition as bootable from any old DOS boot flopy with fdisk on it and point your BIOS to that particular drive and it will boot fine also.  Mirrored partitions are created using a raw write and do not require formatting.

The problem you are experiencing is indicative of a Windows 2000 machine that was originally an NT 4.0 machine that was upgraded.  Unfortunately, there is no easy way to fix this.

Probably the easiest way is to back up the drive ..including permissions...blow the machine away and reinstall the OS in a natively dynamic disk...then restore the backup and create the mirror.

Expert Comment

ID: 6845764
Question(s) below appears to have been abandoned. Your options are:
1. Accept a Comment As Answer (use the button next to the Expert's name).
2. Close the question if the information was not useful to you. You must tell the participants why you wish to do this, and allow for Expert response.
3. Ask Community Support to help split points between participating experts, or just comment here with details and we'll respond with the process.
4. Delete the question. Again, please comment to advise the other participants why you wish to do this.

For special handling needs, please post a zero point question in the link below and include the question QID/link(s) that it regards.
Please click the Help Desk link on the left for Member Guidelines, Member Agreement and the Question/Answer process.  http://www.experts-exchange.com/jsp/cmtyHelpDesk.jsp

Please click you Member Profile to view your question history and keep them all current with updates as the collaboration effort continues, to track all your open and locked questions at this site.  If you are an EE Pro user, use the Power Search option to find them.

To view your open questions, please click the following link(s) and keep them all current with updates.

------------>  EXPERTS:  Please leave any comments regarding your closing recommendations if this item remains inactive another seven (7) days.
Thank you everyone.
Moderator @ Experts Exchange

P.S.  For any year 2000 questions, special attention is needed to ensure the first correct response is awarded, since they are not in the comment date order, but rather in Member ID order.

Author Comment

ID: 6870637
Thanks rcasteel.

My friend wanted to know the answer. so, i already passed the info. thank you everyone.

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

If you’re involved with your company’s wide area network (WAN), you’ve probably heard about SD-WANs. They’re the “boy wonder” of networking, ostensibly allowing companies to replace expensive MPLS lines with low-cost Internet access. But, are they …
This program is used to assist in finding and resolving common problems with wireless connections.
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…

589 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