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GPT Shared Disks Issue in Windows Server 2003 Clusters

GPT and MBR are two standard layouts used for partition table on a hard disk. In MBR-based partition table, the system inserts the disk partioning information in MBR itself, but the same information is placed in GPT header in GPT. The GPT-aware operating systems checks the partition type to be of type 0xEE that encompasses the entire GPT drive. But some operating systems' services cannot recognize this ID and show the disk as inaccessible. So, to solve the issue, you might need to convert the GPT disk to basic disk using MBR scheme. This causes the entire data of partitions to delete. Thus, you are suggested to backup it prior to perform the partition table conversion. However, if you lose it because of any backup concerns, you should use a windows partition recovery utility to recover them.

For instance, consider you use Windows Server 2003, Windows Server 2003 SP1 or Windows Server 2003 SP2 on a GPT disk. You might notice these symptoms:

• Cluster service cannot recognize the GPT disks for shared disks

• Server cluster programs and services depending on GPT disk resources cannot access the GPT disks

• After you install the cluster service, upgrade disk option to or from GPT is not available

Cause

The prime reason for this behavior is that Windows Server 2003-based server clusters do not recognize GPT disks and cannot read them. The Configuration Wizard creates a single node cluster after cluster service in configured on a GPT disk and with a local quorum resource.

Solution

To solve the issue, discussed above, you should remove the cluster service and convert the GPT disk to MBR disk. For this, you require to follow these steps:

• Click Start | Administrative Tools | Computer Management

• Click Disk Management in the console tree

• Right-click the target GPT disk and click Convert to MBR disk

Alternatively, you can choose to run convert mbr command for the target disk. After converting the disk, you need to restore from backup. But if it fails for any reason, you need a powerful solution of windows partition recovery. Incorporated with advanced partition recovery technology, these windows partition recovery tools prove to the most effective tools at recovering lost data.

Stellar Phoenix Windows Data Recovery is a full-featured and secure utility to recover lost, missing, deleted, formatted and damaged Windows partitions. It is a powerful windows partition recovery tool that supports Windows 7 RC1, Vista, XP, 2003 and 2000 based systems. The tools allows for complete data recovery while providing advanced features.

About the Author

Bury Shane is a data recovery expert doing research from last 6 years on exchange recovery and exchange server recovery.

My iMac isn't mounting any CD's, DVD's, or even disk images, and will not boot from the OSX install CD.

All my firmware is updated (but that can't be the problem because I can access DVDs/CDs from it while in target disk mode). So should I reinstall the system? Or is there something I can do?
Everything else works perfectly. It's just the mounting system. Is there any way to rewrite this?

Try this...

When you power on your computer, hold down Apple+Option+P+R until you hear the startup chime twice.

If that doesn't work, reboot your computer and hold down Apple+Option+O+F. When you get to the OpenFirmware propmpt, type 'reset-nvram' and hit return. Next, type 'reset-all'. Your computer will then reboot.

Best of luck!

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