What is the minimum of hard disk can be put into r5 CPG ?

Sorine · **Joined:** Sat Aug 24, 2013 9:54 am **Posts:** 4

Hello,

We have the following situation, we are using a 3par 7400 2-node with 10k and 15k rpm 300gb sas disks.

I would like to know what the minimum of hard disk can be put into r5 CPG

Thanks in advance

kte · **Joined:** Fri Aug 23, 2013 6:22 pm **Posts:** 5

depends on the what type of raid 5 you want 3+1 or 7+1 this decides the number of disk you need x the number of controllers , so x 2

k

Sorine · **Joined:** Sat Aug 24, 2013 9:54 am **Posts:** 4

Thank you for your reply

So if I want to creat R5 (2:1) I will need a minimum 6 Disks ?

Many Thanks

kte · **Joined:** Fri Aug 23, 2013 6:22 pm **Posts:** 5

for a 7000 a sff cpg is at least 8 disks, lff is at least 12 disks

k

Sorine · **Joined:** Sat Aug 24, 2013 9:54 am **Posts:** 4

Hi

Thanks for your reply

Could you please tell me where I can find these informations

Many thanks

PearMotion · **Posted:** Thu Sep 12, 2013 5:09 am

Why do you want to limit the amount of disks in a CPG? Utilise the wide striping and make ALL of your SAS drives into a single R5 CPG. Then use ALL of your SAS drives to make a R1 CPG. You will get much better performance at about 40-60GB written or more by using wide striping.

The only time I ever restrict CPGs to specific hard disks is to test performance benifits of wide striping and illustrate that more drives in a CPG is better.

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What is the minimum of hard disk can be put into r5 CPG ?

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