ASM actively to avoid hot spots and make copies of archived newspapers?

Hi all

I have two small question, I hope.

1 ASM avoid hot spots of rebalancing active files, or the re - balance does when records are added and deleted? I believe that ASM is not "actively" hot spots in this way, simply avoids through its design, i.e. striping of files/entries across all the LUNS in a disc of the group, but need to confirm my manager.

2 using external redundancy, ASM does make copies of the archived redo logs?

Thank you
Stuart

ASM avoids implicitly "hotspots" using the SAME methodology to strip everything on all the disks in the disk group, you are the answer is Yes. A rebalancing operation is necessary when the disks are added or removed from the disk group, if the number of disks does not change then the files will be always balanced on these discs (hope makes sense).

External redundancy faces ASM does nothing with the creation of redundant copies of all files, external redundancy means that you use RAID protection at the level of storage (e.g. RAID1), so ideally all data written to the asm disks is reflected at the level of storage on redundant disks in the RAID group. With external redundancy, the only way ASM will write two copies of a newspaper to check is if you tell the database to write in two places on ASM disks.

Tags: Database

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