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Dynamic Disk Numbering and the DmDiag.exe Tool

This article was previously published under Q222470
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Windows 2000 contains a fault-tolerant disk component named dynamic disks that is different then the fault-tolerant disk component in earlier versions of Microsoft Windows NT. You may administer dynamic disks by using the Disk Management snap-in. The DmDiag.exe tool can be used to decipher disk numbering, and this may be useful for situations where your disk numbering is very complex.
There are now two disk types, basic and dynamic. A dynamic disk is the only type of disk you may use to create new mirrors, stripe sets, extended or spanned or RAID-5 volumes.

With dynamic disks, all volume information is stored in a private database at the end of the disk. Disks are numbered as they are upgraded from basic to dynamic, so they can be numbered differently from the numbering in the Disk Management snap-in.

For example, in Disk Management you may see the following numbering information:

Disk Management
Disk 0
Disk 1
Disk 2
Disk 3

If you were to upgrade only disk 2 and disk 3 to dynamic (in that order), then the dynamic disk database would display the following numbering:

Windows 2000 Disk #Dynamic Disk Private #

When you use the DmDiag Query command, you receive the following output:

NOTE: Make note of the lines that start with dm DiskX; these denote which dynamic disk private numbers match the numbers in the Windows 2000 Disk Management snap-in.

Disk group: MachineNameDg0DG NAME         NCONFIG      NLOG     MINORS   GROUP-IDDM NAME         DEVICE       TYPE     PRIVLEN  PUBLEN   STATEV  NAME         USETYPE      KSTATE   STATE    LENGTH   READPOL   PREFPLEXPL NAME         VOLUME       KSTATE   STATE    LENGTH   LAYOUT    NCOL/WID MODESD NAME         PLEX         DISK     DISKOFFS LENGTH   [COL/]OFF DEVICE   MODEdg MachineNameDg0 all       default  0        14ad79a0-b48c-11d2-b461-00c04f8eec37dm Disk1        Harddisk2    ntdisk   2048     17767827 -dm Disk2        Harddisk3    ntdisk   2048     17767826 -v  Volume1      gen          ENABLED  ACTIVE   8388608  SELECT    -pl Volume1-01   Volume1      ENABLED  ACTIVE   8388608  CONCAT    -        RWsd Disk1-01     Volume1-01   Disk1    0        8388608  0         Harddisk2 ENAv  Volume2      gen          ENABLED  ACTIVE   4194304  SELECT    -pl Volume2-01   Volume2      ENABLED  ACTIVE   4194304  CONCAT    -        RWsd Disk1-02     Volume2-01   Disk1    8388608  4194304  0         Harddisk2 ENAv  Volume3      gen          ENABLED  ACTIVE   4194304  SELECT    -pl Volume3-01   Volume3      ENABLED  ACTIVE   4194304  CONCAT    -        RWsd Disk2-01     Volume3-01   Disk2    0        4194304  0         Harddisk3 ENAv  Volume4      gen          ENABLED  ACTIVE   4194304  SELECT    -pl Volume4-01   Volume4      ENABLED  ACTIVE   4194304  CONCAT    -        RWsd Disk2-02     Volume4-01   Disk2    4194304  4194304  0         Harddisk3  ENA				

For additional information about dynamic and basic storage, please see the following article in the Microsoft Knowledge Base:
175761 Dynamic vs. Basic Storage in Windows 2000
veritas ldm dmtool dmdiag

Article ID: 222470 - Last Review: 12/05/2015 13:25:14 - Revision: 3.2

Microsoft Windows 2000 Server, Microsoft Windows 2000 Advanced Server, Microsoft Windows 2000 Professional Edition, Microsoft Windows 2000 Datacenter Server

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