What raid should be used on asm oracle rac11g

Hello

As we modernize our system of new hardware and software. We implement rac oracle 11g with asm and using HARDWARE not software raid.

Some people suggest me to use raid 6 here are the questions I'm looking for:

1. what raid 6 means and how it works with asm?

2. what will be the combination allows for optimal performance of storage for example

RAID 1 + 0 = redolog

RAID 5 = Archvielogs

Like this.

Thanks a lot for helping me.

Kind regards

Adnan Hamdus Salam

Adnan says:

As you say «However, ASM can use drives RAID5 or RAID6.» "And because they are already configured as redundant, you can tell ASM not to reflect the content of the disksgroup located on the RAID5 disks.

Fix. You simply set the diskgroup as being external redundant. ASM will therefore not reflect the diskgroup.

It applies to RAID 6 with regard to the mirroring of disks ASM?

It applies to all the RAID drives. You can use the disk - create an ASM diskgroup for these discs and say ASM do not mirror, because this diskgroup resides on redundant disks on the outside.

ASM does not know what levels RAID is a disc. He knows only that it is a disk that can be used. DIRECTIONS for USE, you must explicitly specify ASM. You must specify ASM if you want to use this disk as part of external diskgroup redundant, a normal redundant diskgroup or a diskgroup extremely redundant.

The disc is maybe not even RAID' ed. It could be simply hard drive SATA/SAS. No RAID. And you can tell ASM t create a redundant external diskgroup using the disc. ASM then leaves the redundancy for this disc in your hands and to the underlying storage architecture.

If there is no RAID and SATA/SAS drive failure... Bye Bye all data on this disc. No problem of ASM.

If this disk is part of a set of RAID6 and it fails... not the problem of the DSO. You and the underlying storage system must manage the redundancy and the difficulty of the RAID for this disc.

Only when you say DSO that the diskgroup is redundant, then it will be in the picture. And wait allows you to provide records enough so he could maintain a mirror 2 way or 3-way for this diskgroup, depending on your configuration of the diskgroup.

Tags: Database

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