Home » Server Options » RAC & Failsafe » what different between in /dev/raw/raw* and ORCL:VOL* ? (what different between in /dev/raw/raw* and ORCL:VOL* ?)
what different between in /dev/raw/raw* and ORCL:VOL* ? [message #300360] Fri, 15 February 2008 03:46 Go to next message
Messages: 92
Registered: December 2006
what different between in /dev/raw/raw* and ORCL:VOL* ?

/dev/raw/raw* will be faster or something?

Please see the picture.
  • Attachment: raw_vol.jpg
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Re: what different between in /dev/raw/raw* and ORCL:VOL* ? [message #301000 is a reply to message #300360] Mon, 18 February 2008 23:50 Go to previous message
Muhammad Ahmad
Messages: 30
Registered: November 2002

On Linuxbased systems, disks can be configured as direct raw devices (/dev/raw/raw*) or can be ASMaware (ORCL:AVOL*)using the ASMLIB utility.

When configuring ASMdisks using basic raw devices, no additional configuration is required. However, if the ASMLIB utility is used, then ASM disks are created using the oracleasm script as follows:

[root@oradb1 root]# /etc/init.d/oracleasm createdisk AVOL1 /dev/sdg
Creating Oracle ASM disk "AVOL1" [ OK ]

When ASM scans for disks, it will use that string ORCL:AVOL* and find any devices it has permission to open.

Upon successful discovery,the V$ASM_DISK view on the ASM instance will list these disks.

After disks have been discovered by ASM, they can be grouped together.


Muhammad Ahmad

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