Use asmtoolg (GUI version) to create device names; use asmtoolg to add, change, delete, and examine the devices available for use in Oracle ASM.

1. In directory where you unzipped the Oracle Grid Infrastructure image files, go the bin\asmtool folder and double-click asmtoolg.

   If user access control (UAC) is enabled, then you must create a desktop shortcut to a command window. Right-click the shortcut, select Run as Administrator, and launch asmtoolg.

2. Select the Add or change label option, and then click Next.

   asmtoolg shows the devices available on the system. Unrecognized disks have a status of "Candidate device", stamped disks have a status of "Stamped ASM device," and disks that have had their stamp deleted have a status of "Unstamped ASM device." The tool also shows disks that are recognized by Windows as a file system (such as NTFS). These disks are not available for use as Oracle ASM disks, and cannot be selected. In addition, Microsoft Dynamic disks are not available for use as Oracle ASM disks.

3. On the Stamp Disks window, select the disks to you want to use with Oracle ASM.

   For ease of use, Oracle ASM can generate unique stamps for all of the devices selected for a given prefix. The stamps are generated by concatenating a number with the prefix specified. For example, if the prefix is DATA, then the first Oracle ASM link name is ORCLDISKDATA0.

   You can also specify the stamps of individual devices.

4. Optional: Select a disk to edit the individual stamp (Oracle ASM link name).
5. Click Next.
6. Click Finish.