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Disk usage on ODA – Free MB and usable MB

Introduction Oracle Database Appliances rely on ASM to manage disk redundancy. And ASM is brilliant. Compared to RAID, redundancy is managed at the block level. For NORMAL redundancy, which is similar to RAID1, you need at least 2 disks, but it can also work with 3 disks, 4 disks, 5 disks and so on. There is no need for parity at the disk level. HIGH redundancy, which does not exist in RAID technology, is basically a triple security....

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Moving ASM Diskgroups to another Server

Lately I saw two posts about ASM diskgroups. One by Rodrigo Mufalani talking about migrating ASM diskgroups to another server after failure. The other one by Michael Dinh talking about renaming ASM diskgroups. Here I’d like to summarize some information about moving ASM diskgroups and add something I had in the past This reminded me of an issue I had years ago and not sure I blogged about it. Back then I had a client that wanted to...