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Solving a Software RAID Problem with Diskpart

    Question

  • I am a developer, no administrator...

    There is a Windows 2008 Server with two disks having a Software RIAD. One of the disks is marked as "missing". I try to reactivate the missing disk with the help of Disk Management. Immediately the message "The Plex is missing" is given (translated from German). I read about replacing a failed disk in http://technet.microsoft.com/en-us/library/cc758037(WS.10).aspx. However, not being an administrator at all, I am somewhat unsure.

    At the end of this thread there is some information from diskpart. By reading the above article, I understand...

    • There are two disks, named "0" and "M0".
    • The disk "M0" is marked as missing ("fehlend" in German).

    I would separate the disks with...

    • break disk M0 nokeep

    Then I would select a volume and add the previously missing disk...

    • select volume 0
    • add disk M0

    Do I have to do this for both volumes (partitions C and D)? Does adding a disk always mirror a complete disk? Or do I have to also execute?

    • select volume 1
    • add disk M0

    When will the previously missing disk be formatted? When "add disk M0" is executed? If so, is it ok to execute it twice (once for C and D)?

    Thanks a lot in advance.

    Michael G. Schneider

     

     

    C:\Users\Administrator>diskpart
    
    Microsoft DiskPart-Version 6.1.7601
    Copyright (C) 1999-2008 Microsoft Corporation.
    Auf Computer: S15564832
    
    DISKPART> list disk
    
      Datenträger ###  Status         Größe    Frei     Dyn  GPT
      ---------------  -------------  -------  -------  ---  ---
      Datenträger 0    Online         1397 GB      0 B   *
      Datenträger M0   Fehlend            0 B      0 B   *
    
    DISKPART> list volume
    
      Volume ###  Bst  Bezeichnung  DS     Typ         Größe    Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
      Volume 0     C   System       NTFS   Spiegelung    58 GB  Rd-Fehler  System
      Volume 1     D   Data         NTFS   Spiegelung  1338 GB  Rd-Fehler
    
    DISKPART> select volume 0
    
    Volume 0 ist jetzt das gewählte Volume.
    
    DISKPART> detail volume
    
      Datenträger ###  Status         Größe    Frei     Dyn  GPT
      ---------------  -------------  -------  -------  ---  ---
      Datenträger M0   Fehlend            0 B      0 B   *
      Datenträger 0    Online         1397 GB      0 B   *
    
    Nur Lesen               : Nein
    Ausgeblendet       : Nein
    Kein Standardlaufwerkbuchstabe: Nein
    Schattenkopie            : Nein
    Offline                : Nein
    BitLocker-verschlüsselt    : Nein
    Installierbar            : "Ja"
    
    Volumekapazität        :   58 GB
    Freier Speicherplatz auf Volume:   23 GB
    
    DISKPART> detail volume
    
      Datenträger ###  Status         Größe    Frei     Dyn  GPT
      ---------------  -------------  -------  -------  ---  ---
      Datenträger M0   Fehlend            0 B      0 B   *
      Datenträger 0    Online         1397 GB      0 B   *
    
    Nur Lesen               : Nein
    Ausgeblendet       : Nein
    Kein Standardlaufwerkbuchstabe: Nein
    Schattenkopie            : Nein
    Offline                : Nein
    BitLocker-verschlüsselt    : Nein
    Installierbar            : "Nein"
    
    Volumekapazität        : 1338 GB
    Freier Speicherplatz auf Volume:  681 GB
    
    
    
    
    
    

     

    Friday, October 14, 2011 7:01 AM

Answers

  • Hi,

    From the OP, you have 2 disks which are mirrored. The mirrored disks (RAID1) are partitioned as Volume0 and Volume12. The Volume0 (c:) is a system volume.

    Above all you will need to confirm if the M0 disk is actually broken or not. If it is broken/corrupted, as you said, now you need to remove the corrupted disk (M0) and replace it with a health one. And both volumes need to be mirrored manually with commands "select + add".

    As the volume0 is a system volume, you may need to perform the steps in following article to create a mirrored system volume:

    http://support.microsoft.com/kb/302969

    Meanwhile, actually these steps can be performend in Disk Management instead of Diskpart if you are not familiar with it.


    TechNet Subscriber Support in forum |If you have any feedback on our support, please contact tnmff@microsoft.com.
    Monday, October 17, 2011 7:50 AM
    Moderator

All replies

  • Hi,

    From the OP, you have 2 disks which are mirrored. The mirrored disks (RAID1) are partitioned as Volume0 and Volume12. The Volume0 (c:) is a system volume.

    Above all you will need to confirm if the M0 disk is actually broken or not. If it is broken/corrupted, as you said, now you need to remove the corrupted disk (M0) and replace it with a health one. And both volumes need to be mirrored manually with commands "select + add".

    As the volume0 is a system volume, you may need to perform the steps in following article to create a mirrored system volume:

    http://support.microsoft.com/kb/302969

    Meanwhile, actually these steps can be performend in Disk Management instead of Diskpart if you are not familiar with it.


    TechNet Subscriber Support in forum |If you have any feedback on our support, please contact tnmff@microsoft.com.
    Monday, October 17, 2011 7:50 AM
    Moderator
  • Thanks a lot for the answer.

    I have successfully separated the mirror with the help of DISKPART. There were no problems. A new disk will be built into the server soon.

    I had to use DISKPART, as Disk Management did not offer the commands for separating the disk, or for reactivating the second disk. They were grayed out. If the new disk is inside the server, I will then use Disk Management.

    Michael G. Schneider

    Tuesday, October 18, 2011 6:11 AM