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 Post subject: backend IOPS
PostPosted: Mon Dec 10, 2018 3:50 pm 
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Joined: Sun Nov 26, 2017 5:48 am
Posts: 1
Location: France
Hello,

I would like to understand somethings.

I read on internet, if you have a Raid5 you will have a write-penalty of 4.

It is the same if you have a setsize of 3+1 or 7+1 ? Does it change ?

On Ninja you have front-end IOPS estimated, and i would like to calculate back-end IOPS.

thank you
:P


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 Post subject: Re: backend IOPS
PostPosted: Tue Dec 11, 2018 7:16 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1570
Location: Europe
Write penalty per disk is the same.
IO1: read data
IO2: read parity
IO3: write data
IO4: write parity

What do change with larger set sizes is how much data needs to be read to re-create parity during disk failure as it needs to read the entire set.


Also, RAID6 is the way to go now.

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