Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 295
  • Last Modified:

Mirroring 2 NTFS Hard Disks under Win2k

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.

1 Solution
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.
pandavAuthor Commented:
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:

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.
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

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.
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.
pandavAuthor Commented:
Thanks rcasteel.

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

Featured Post

Become an Android App Developer

Ready to kick start your career in 2018? Learn how to build an Android app in January’s Course of the Month and open the door to new opportunities.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now