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Offline Dynamic Disks Occur Due to the Faulty Disk Group IDs and LDM Databases

Publication Date:  2012-07-22 Views:  55 Downloads:  0
Issue Description

In a project, bad sectors occur on two hard disks in the S5500 storage device, causing the RAID fails. However, after the RAID recovery and storage software upgrade are performed by technical personnel, the services still cannot be recovered on the storage device. After analysis, the LUNs of three storage arrays are found to be Offline on the host. However, the LUNs remain Offline after the Offline command is executed.

Product and version information:
  • S5000 series
  • The OS is Windows 2003 SP2 x86
The networking is as shown in Figure 1.
Figure 1 The networking of a Wuhan project
Alarm Information
None
Handling Process
  1. Back up the LDM databases for all the dynamic disks by using the Microsoft tools, and then perform the LDM database recovery to make the dynamic disks Online. The detailed procedure is as follows:
  2. At the command line, type the following commands to back up the LDM databases.

     

    dmpss dumpconfig 1 disk1.dmp

    dmpss dumpconfig 2 disk2.dmp

    dmpss dumpconfig 3 disk3.dmp

    dmpss dumpconfig 4 disk4.dmp

     

  3. Run the following commands to recover the LDM databases.

     

    dmpss copyconfig 1 3 a75f0f41-dd34-4cd5-b6bb-147cdf5452f2

    dmpss copyconfig 1 4 0961a0ef-8383-4f9e-a1d7-aaeced58ad73

     

  4. Restart the server, right-click the My Computer icon and choose Manage, and the Computer Management dialog box is displayed. Under the Disk Management node, try to reactivate the dynamic disks.
Root Cause
  1. It is found that one of the disks in the dynamic disk group is not mounted to another server.
  2. The host is restarted after the RAID recovery and storage software upgrade are performed. However, the dynamic disk remain Offline after the restart.
Conclusion:
  • The LDM database of the dynamic disk is faulty after the host is restarted, causing the dynamic disk to be Offline.
Suggestions

It is not recommended to set dynamic disks due to certain unstable factors. If users have already set dynamic disks, it is recommended to reset them to basic disks. The risk of data loss increases when Offline disks exist.

Table 1 describes how to back up and recover LDM data in Windows.

Table 1 Commands for LDM data backup and recovery

Item

Command

Command Description

Back up LDM data

dmpss dumpconfig source-disk-number target-file

source-disk-number stands for the code of the disk of which the LDM data is to be backed up.

target-file stands for the file name of the LDM data to be backed up, with the extension .dmp.

Recover LDM data

dmpss copyconfig source -disk-number dest-disk-number dest-disk-ID

source -disk-number stands for the code of the disk of which the LDM data is to be backed up.

dest-disk-number stands for the code of the destination disk on which the backup LDM data is to be stored.

dest-disk-ID stands for the ID of the destination disk on which the backup LDM data is to be stored.

NOTE:

For the information about the disk ID or else, please contact Microsoft technical engineers for specific software.

END