Re: Exadata Cell Capacity and performance

Are these figures correct? Actually in our X8-2 half rack high capacity we get ~179TB of flash storage. And here you showed the same on X7-2, so i have not checked though but you may double check the data sheet to have the correct IOPS and storage stats to get a clear comparison.

And I think if Disk IOPS is degrading from ~28K to ~18K, even if you have other small databases in existing X3 and you are moving only the critical DB to X8 , you should do a full fledged production workload replay on RAT to see the real impact. As because any Disk IO dependent workload may see degradation. Others may comment.

On Tue, Aug 17, 2021 at 1:18 AM Lok P <loknath.73_at_gmail.com> wrote:

> Hello All, We have one critical database(say DB1) moving from an X3-2 HC
> full rack exadata machine to a new X7-2 HC half rack exadata machine. The
> existing X3 full rack was hosting ~4 different other small databases along
> with that critical database- DB1. The new X7 will be hosting only the DB1
> database for the time being.
>
> So in this scenario as I see the data sheet and put the figures in as
> below it seems the X7 half rack is better with respect to both flash and
> disk storage capacity and flash IOPS. Just that the disk IOPS seems to be
> lower in case of X7 half rack i.e. ~28K vs ~18K. So considering we are not
> changing any application functionality of oracle software version etc, so
> is it okay to assume we will be seeing improvement only , thus its safe to
> directly go with the migration without any full fledged performance test?
> Or there is any chances of performance degradation here and thus a full
> fledged testing needed like real application testing?
>
>
> IOPS For Half Rack
> Flash Read IOPS Flash write IOPS Disk IOPS
> X3-2 High Capacity (Full Rack) ~1.5million(~k per cell) ~1million(K per
> cell) ~28K
> X7-2 High Capacity (Half rack) ~2.3Million ~2.1million ~18K
> Storage capacity For Half Rack
> Raw disk Storage High Redundancy Normal redundancy Flash Storage
> X3-2 High Capacity (Full Rack) ~504TB (TB/cell) ~TB(TB/cell) ~224TB(
> TB/cell) ~22.4TB(~TB/Cell)
> X7-2 High Capacity (Half rack) ~840TB (TB/cell) ~TB ~341TB ~179.2TB
> (25.6TB/Cell)
>

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