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тАО12-15-2007 11:19 PM
тАО12-15-2007 11:19 PM
raw logical volumes
what is the meaning of raw logical volume in oracle.
For success, attitude is equally as important as ability
2 REPLIES 2
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тАО12-16-2007 12:03 AM
тАО12-16-2007 12:03 AM
Re: raw logical volumes
Are you asking for raw FS to be used in ASM?
Dreams are not which you see while sleeping, Dreams are which doesnt allow you to sleep while you are chasing for them!!
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тАО12-16-2007 12:42 AM
тАО12-16-2007 12:42 AM
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.
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.
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