Doubt with raw partition ASM

Hi Gurus,
Have a doubt regarding the raw partitions being used in ASM.
1.Is raw partition being used only applicable to linux platform , or can it be done on other plaform as well
2.Is it correct if I say if a diskgroup is created with single raw disk with external redundancy , we are saying the oracle need not do the redundancy and we have set up redundancy for the raw partition at lus/os level.
3.what in general is better asmlib/raw partition for management of ASM.
Thanks
Atul

Hi,
1.Is raw partition being used only applicable to linux platform , or can it be done on other plaform as well.
==>> Raw partition is not supported 11G onwards .
     On linux ASM support both types of devices ,block and character.
For other unix version,ASM supports character devices.
2.Is it correct if I say if a diskgroup is created with single raw disk with external redundancy ,
we are saying the oracle need not do the redundancy and we have set up redundancy for the raw partition at lus/os level.
==>> Yes,in case of external redundancy ASM does not do mirroring .So,it depends upon OS level redundancy.
     if you use normal redundancy ,ASM will do mirroring alongwith stripping at ASM level.
3.what in general is better asmlib/raw partition for management of ASM.
===>> ASMlib devices are created upon partitioned device .
      And ASM will use ASMlib API to access those devices and do IOs.
   For Raw partition ASM will use system calls directly to access those devices.
Advantages of ASMlib,
+ ASMlib will keep device persistency across reboot
+ Use ASMlib API for processing IOs in batches
-- This give slightly better performance .
If you use UDEV rules ,then it will give device persistency across reboot ,but use
system calls for IOs directly.
For raw partitions ,you need to maintain rawservices also.
and it limits you to have 256 devices .
But ASM can use upto first 10000 disks and maximum size can be of 2Tb in non-exadata.
With these limitation and advantages,it is better to use ,
Udev rules and ASMlib compared to raw ...
    while comparing ASMlib with Udev ,they are almost same,with ASMlib have slight advantage.
Regards,
Aritra

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raitsarevo wrote:
I want to create MAp raw device for block device to use for installing OCR and Voting disk. Why not define it as a raw devices (despite raw devices being deprecated in the current Linux kernel, it is still available for backwards compatibility)? Quite easy to configure.
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answered by Chinarsource:-how to identify which rawdevice Disk Is named as VOL1 IN ASM from os level
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