Re: Oracle multi Tb refresh for UAT from Prod

Hi Niall,

I know that. CoW triples your I/O rate on write while "redirect on write" remaps the original LUN to the news blocks. That is what I was referring to as "optimized CoW". Everybody knows what CoW is, but not everybody is familiar with redirect on write. A little inaccuracy for the sake of clarity, same as the Niels Bohr model of atom.

Regards

On 11/17/18 5:36 AM, niall.litchfield_at_gmail.com wrote:
> CoW is one of *two* alternative options for creating snapshots, PURE,
> IBM and no doubt other vendors use Redirect on Write which doesn't
> impose the same write penalty see for example
> https://storageswiss.com/2016/04/01/snapshot-101-copy-on-write-vs-redirect-on-write/
> .
>
>

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Mladen Gogala
Database Consultant
Tel: (347) 321-1217


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