Database Configuration Assistant - Oracle 10g/11g Data and Database Management Utilities - page 292

Disk layout
At least one raw partition should available. The DISKPART utility should be used
(Win2K3) or Disk Manager (Win2K & Win2k3).Windows does not automatically
mount raw disks and make them visible. You must enable automounting . Using
Diskpart , at the Diskpart prompt, type:
DISKPART> automount enable
At the Command Prompt, type:
diskmgmt.msc
This will start the Disk Management Windows utility. If the disk is in dynamic mode,
change it to Basic mode. Create a new partition on the empty disk and select an
extended partition. Select the partition size to fill the disk. Once the wizard is ready it
will create the extended partition.
Logical partitions
Once the extended partition is created, the next step is to create the logical partitions.
In the disk management utility, you should be able to see the extended partition
created. Right click on the extended partition and create as many logical partitions
as required. Make sure you don't assign a drive letter to the partition. Also, do not
format the logical partitions; the assistant displays the option, and ensure no format
is performed on the raw disk. At this point you should be able to see the logical
partition created. Repeat these steps for as many logical partitions as required.
Setup ASM
Once you are ready with the logical partitions, the next phase is to set up the ASM
environment. Once in the Configure ASM assistant, define the Disk Group Name
(DATA for example) by clicking on the Stamp Disks. As there are currently no disks
labeled, the asmtool performs the disk labeling. Using the asmtool you should be
able to see the partitions, and the disk status, and if the Candidate device flag is set
then it can be selected and labeled. The disk name format is something like \Device\
Harddisk1\Partition_N . Once they are labeled they will appear as candidate disks,
you should be able to see them as a candidate disk back in the ASM assistant, they
will be listed in a format similar to this:
\\.\ORCLDISKDATA_N
In the final step you should be able to see the candidate disks, just compose the ASM
disk groups as required and you are done with the ASM setup procedure.