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raw logical volumes

Prashanth Waugh
Esteemed Contributor

raw logical volumes

what is the meaning of raw logical volume in oracle.
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2 REPLIES
Anshumali
Esteemed Contributor

Re: raw logical volumes

Are you asking for raw FS to be used in ASM?
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Hasan Atasoy
Honored Contributor

Re: raw logical volumes

hi atulkumar ;

raw logical volumes are used especially for performance issues or RAC. under normal filesystem usage, a filesystem is created on raw device ( /dev/vg??/rlvolxx ) and oracle data files put on these filesystem. you can see these fs by bdf command. but in raw devic concept oracle data files put directly on raw device without creating a fs on the raw device . so fs buffer cache is not used. in single system , it depend on choice , using raw device. but in rac you have to use raw devices in hp-ux ( if you are not using an expensive product CFS )


Hasan.