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GPT volumes unknown RRS feed

  • Question

  • We have 4 TB GPT volume provided to windows 2008 r2 failover cluster. There are other volumes less than 1 TB in size and those are working fine.

    Problem with 4TB LUN is it shows status as UNKNOWN in cluster management console. Volume is still accessible through windows explorer.

    One more observation..in windows explorer 4TB volume appears as local disk while other cluster volumes appear as clustered disk.



    • Edited by TG9481 Thursday, December 13, 2012 10:36 PM
    Thursday, December 13, 2012 10:02 PM

Answers

  • Hi,

    In some storage devices you need to present this lun as 2008 sometimes this is an extra option. Did you present this disk on both nodes?

    Did you do a reboot ? ( there is no need for this but you will never know )

    While Basic disks that use MBR partition table only support a maximum of 2 TB partitions, basic disks that use GUID partition table (GPT) disks enable partitions that are greater than 2 TB and are fully supported on Failover Clusters, using Windows Server 2008 and 2008 R2.  If you happen to still be using Windows Server 2003, you can add support for GPT based disks with a post Service Pack 2 hotfix, available at:  http://support.microsoft.com/kb/919117

    If you want to learn more about the advantages of GPT disks, here is a good FAQ:  http://www.microsoft.com/whdc/device/storage/GPT_FAQ.mspx  

    Source:

    http://blogs.msdn.com/b/clustering/archive/2009/12/15/9937435.aspx


    Greetings, Robert Smit [MVP] http://robertsmit.wordpress.com/ “Please click "Vote As Helpful" if it is helpful for you and Proposed As Answer”

    Friday, December 14, 2012 7:47 AM
    Moderator

All replies

  • Hi,

    > Problem with 4TB LUN is it shows status as UNKNOWN in cluster management console.
    > Volume is still accessible through windows explorer.

    Did you mean the 4TB GPT volume still has a drive letter and is still accessible through Windows Explorer?

    Generally, the Unknown status occurs when the boot sector for the volume is corrupted (possibly due to a virus) and you can no longer access data on the volume. The Unknown status also occurs when you install a new disk but do not successfully complete the wizard to create a disk signature.

    You may refer to following steps to initialize this disk (note: this may erase all data in the disk):

    1. Open Computer Management (Local).
    2. In the console tree, click Computer Management (Local), click Storage, and then click Disk Management.
    3. Right-click the disk you want to initialize, and then click Initialize Disk.
    4. In the Initialize Disk dialog box, select the disk(s) to initialize. 
          
      On x86-based computers running Windows Server 2003 with Service Pack 1 (SP1), Itanium-based computers, or x64-based computers, you can select whether to use the master boot record (MBR) or GUID partition table (GPT) partition style.
           
      The disk is initialized as a basic disk.

    For more information please refer to following MS articles:

    Troubleshooting Disk Management
    http://technet.microsoft.com/en-us/library/cc787481(v=WS.10).aspx
    You cannot select or format a hard disk partition when you try to install Windows Vista, Windows 7 or Windows Server 2008 R2
    http://support.microsoft.com/kb/927520
    Windows’ Support for Disks with Capacity Greater than 2TB
    http://support.microsoft.com/kb/2581408


    Lawrence

    TechNet Community Support

    Friday, December 14, 2012 7:21 AM
    Moderator
  • Hi,

    In some storage devices you need to present this lun as 2008 sometimes this is an extra option. Did you present this disk on both nodes?

    Did you do a reboot ? ( there is no need for this but you will never know )

    While Basic disks that use MBR partition table only support a maximum of 2 TB partitions, basic disks that use GUID partition table (GPT) disks enable partitions that are greater than 2 TB and are fully supported on Failover Clusters, using Windows Server 2008 and 2008 R2.  If you happen to still be using Windows Server 2003, you can add support for GPT based disks with a post Service Pack 2 hotfix, available at:  http://support.microsoft.com/kb/919117

    If you want to learn more about the advantages of GPT disks, here is a good FAQ:  http://www.microsoft.com/whdc/device/storage/GPT_FAQ.mspx  

    Source:

    http://blogs.msdn.com/b/clustering/archive/2009/12/15/9937435.aspx


    Greetings, Robert Smit [MVP] http://robertsmit.wordpress.com/ “Please click "Vote As Helpful" if it is helpful for you and Proposed As Answer”

    Friday, December 14, 2012 7:47 AM
    Moderator
  • You might try deleting the resource from cluster and then re-adding it to see if that resolves this issue. If that doesn't work, post a screen shot so we can get a better understanding what you are seeing.

    Visit my blog about multi-site clustering

    Friday, December 14, 2012 12:56 PM
    Moderator