Identifying GPT disk in server 2k3 cluster

NTDEV
1

Till windows 2k3, it supports only mbr disk for server cluster. It uses disk
signature for identifying it as a cluster disk. But if you want to use GPT
in win2k3 sp2 server cluster, you have to install a hotfix. For identifying
GPT disk in cluster, a 4-byte unique id is used. This is not DiskId, because
diskid for gpt disk is a GUID. Can anyone tell me what is this and how to
get it

–
Regards
Rohit Gauba

“A positive thought is the seed of a positive result”

2

IoReadPartitionTableEx returns an EX version of the drive layout structure
that has GPT info:

http://msdn.microsoft.com/en-us/library/aa364001(VS.85).aspx

-scott

–
Scott Noone
Consulting Associate
OSR Open Systems Resources, Inc.
http://www.osronline.com

“Rohit” wrote in message news:xxxxx@ntdev…
Till windows 2k3, it supports only mbr disk for server cluster. It uses disk
signature for identifying it as a cluster disk. But if you want to use GPT
in win2k3 sp2 server cluster, you have to install a hotfix. For identifying
GPT disk in cluster, a 4-byte unique id is used. This is not DiskId, because
diskid for gpt disk is a GUID. Can anyone tell me what is this and how to
get it

–
Regards
Rohit Gauba

“A positive thought is the seed of a positive result”

3

Thanks for the response.

I think I am not able to express myself clearly. In server cluster
2k3, windows uses a 4byte signature for identifying GPT cluster disk.

In win2k8 cluster server, windows uses diskid(which is a guid) to identify
GPT cluster disk, which we can get using
*IOCTL_DISK_SET_DRIVE_LAYOUT_EX*http:
.

I want to know what is this 4 byte signature windows2k3 uses to identify GPT
cluster disk

Regards
Rohit

On Fri, Sep 3, 2010 at 7:32 PM, Scott Noone wrote:

> IoReadPartitionTableEx returns an EX version of the drive layout structure
> that has GPT info:
>
> http://msdn.microsoft.com/en-us/library/aa364001(VS.85).aspx
>
> -scott
>
> –
> Scott Noone
> Consulting Associate
>
> OSR Open Systems Resources, Inc.
> http://www.osronline.com
>
>
> “Rohit” wrote in message news:xxxxx@ntdev…
>
> Till windows 2k3, it supports only mbr disk for server cluster. It uses
> disk signature for identifying it as a cluster disk. But if you want to use
> GPT in win2k3 sp2 server cluster, you have to install a hotfix. For
> identifying GPT disk in cluster, a 4-byte unique id is used. This is not
> DiskId, because diskid for gpt disk is a GUID. Can anyone tell me what is
> this and how to get it
>
> –
> Regards
> Rohit Gauba
>
> “A positive thought is the seed of a positive result”
>
> —
> NTDEV is sponsored by OSR
>
> For our schedule of WDF, WDM, debugging and other seminars visit:
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–
Regards
Rohit Gauba

“A positive thought is the seed of a positive result”</http:>