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 Post subject: 3PAR 8200 CPG Set Size
PostPosted: Mon Oct 21, 2019 9:33 am 

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


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 Post subject: Re: 3PAR 8200 CPG Set Size
PostPosted: Mon Oct 21, 2019 9:55 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 980
Location: Europe
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.

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