3PAR 8200 CPG Set Size

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Strieckel
Posts: 1
Joined: Mon Oct 21, 2019 9:15 am

3PAR 8200 CPG Set Size

Post by Strieckel »

Hi Folks,

I hope you are able pointing me into the right direction?

We have a 3PAR 8200 attached with 10 x 1,92TB SSDs.
Current CPG Set size is 4+1 Raid 5.

I need to add now 8 x 1.92TB SSDs more to the Storage getting in total 18 SSDs installed.

The Storage is used for Development and Testing and not real in production, so we want to go further with RAID 5 getting a higher capacity.

But I am unsure which Set size under Raid 5 fit best when 18 Disks are installed?

Should I go with a Set size = 5+1?

Would this fit best for 18 Disks installed as this dividable? 18 / 6 (5+1) = 3

Or should I calculate the Set size from node perspective as each Node own the half of disk installed? 18 / 2 = 9 = set size 8+1

Many thanks for your help

Br
Joerg
MammaGutt
Posts: 1578
Joined: Mon Sep 21, 2015 2:11 pm
Location: Europe

Re: 3PAR 8200 CPG Set Size

Post by MammaGutt »

I think 7+1 is the biggest R5 set size.

With 18 drives you don't have a sweet spot from a performance perspective.

I would consider R6 14+2 or R5 7+1 for maximum capacity.
The views and opinions expressed are my own and do not necessarily reflect those of my current or previous employers.
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