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in a Standalone GI Installation you did not need voting or OCR Disks. This things are only needed at cluster level installation.
Please pay attention
Voting and ocr is not need for standalone configuration, then is not necessary create diskgroup for it.
Your environments is standalone, isn't it?
For details about voting and ocr disks: http://docs.oracle.com/cd/E11882_01/rac.112/e16794/votocr.htm
Yes my environment is standalone.
Although of ASM depend on CSS to work in standalone environment you don't configure voting disk or OCR. You need only be concerned about OLR file. (backup and restore operation). Oracle Restart: how do you manage, create and remove OLR Backups [ID 1273928.1]
When you install Oracle Grid Infrastructure for a standalone server, Oracle Universal Installer (OUI) configures the single-node version of Oracle Cluster Synchronization Services (CSS).
The CSS service is required to enable synchronization between an Oracle ASM instance and the database instances that rely on it for database file storage.
I recommend you create a small diskgroup to store ASM Spfile. ASMCA by default store ASM Spfile on first Diskgroup created, so if you remove this diskgroup ASM won't start.
ASM 11gR2 Instance Is Unable To Start Due To ASM Spfile Is Missing. [ID 946145.1]
Because that I recommend you store this file on a Diskgroup separately to avoid headache.
if you are using Oracle Standalone database on ASM, then you not need any VOTING DISK and OCR.
Because this need for only Oracle Real Application Cluster - Clusterware.
Please watch my videos, please :
http://www.youtube.com/watch?v=aB5wVfBnmQ8&feature=g-crec-u - Installing Oracle Database 11g on ASM (Standalone Server)
http://www.youtube.com/watch?v=YH8YChP6e_w&feature=g-crec-u - Migration to ASM (AZEROUG Last meeting presentation video)
Mahir M. Quluzade