Disks / start transposition ASM

Hi all

Db1 size: 700 GB +.

Size of DB2: 2.8 TB +.

+ ASM_DG_DATA is > for CRD files

+ ASM_DG_FRA is > for rman backups / archive files in logs/EXPDP...

> > All recommended options?

How many drives / starts, we can keep transposition ASM (for good e/s)?

I suggest you consult the documentation:

https://docs.Oracle.com/CD/E11882_01/server.112/e18951/asmprepare.htm#OSTMG11000

You can find more useful 'Recommendations for the preparation of storage'.

For example:

A minimum of four (Oracle ASM disks) LUNS of equal size and performance is recommended for each disk group.

Using Oracle ASM mirroring redundancy when using no hardware RAID, or when you need host-based volume management features.


I suggest to keep in mind that ASM is not RAID. RAID uses a fixed allocation size and reflects the data at the level of the block device. ASM reflects files by using a size of distribution variable patterns of files, which gives an advantage of performance when writing to newspapers in recovery, for example.  You can combine ASM and RAID to increase performance and features, but what you choose depends on your budget and your requirements, which is anyone's guess.

About disk groups ASM how you create, my answer is that there is no performance gain unless you can redirect i/o to separate physical disks. At a minimum, it is best to separate the DATA and FRA, but otherwise, if all the data is on the same storage device and the path of I/O, additional disk groups will not give you improve performance.

Unless you know exactly how you size your drive includes and how you want to limit the occupation of space by a specific disk group, several groups of disks have the potential for management fees and complications, for example when executing space in one group, while having "too much" in another.

Tags: Database

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    user634358 wrote:
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