Improve company productivity with a Business Account.Sign Up

x
?
Solved

How to Configure Raid 5 on Perc 6i

Posted on 2009-04-06
3
Medium Priority
?
2,408 Views
Last Modified: 2012-06-21
Hello all,

I have just bought a new Dell Poweredge Server. The Server has a Perc6i Raid Controller. The server also has 8x450GB HotPlug SAS drives.

To my knowledge if I setup Raid5 I should have approx 3TB of useable space. When I setup up the raid, reboot and start installing W2k8 at the hard-disk section I do get 2.9TB of space.

Now I partition the drive to have 300GB and was going to leave the rest for the other partition. The moment I do so I get the 3 partitions, the 300GB I created, a 1.7TB useable partition and an 800GB unuseable partition.

Can some of you tell me why this is happening? I have setup the Raid from the onboard controller and all looked fine. It also told me I would have about 2.9TB space but maybe I am missing something.

Thanks in advance. Cheers
0
Comment
Question by:devereandpartners
  • 2
3 Comments
 
LVL 18

Accepted Solution

by:
BigSchmuh earned 2000 total points
ID: 24097212
I think the problem comes from the MBR 2TB partition limit.
This MBR partition format does not allow enough sectors to be accounted for more than 2TB (even if it displays the correct number of sectors from your 3TB volume)
   http://en.wikipedia.org/wiki/Master_boot_record

Another partition format named GPT allows for larger partition ... but it allows booting only on EFI compatible motherboard (Itanium and some rare others...but no PowerEdge servers)

May be, you can set 2 arrays of less than 2TB each:
-1 raid 5 using 3x450GB (900GB)
-1 raid 5 using 5x450GB (1.8TB)
OR
-1 raid 5 using 8x290GB (<2TB)
-1 raid 5 using 8x160GB (1.1TB)
OR
-1 raid 10 using 4x (2x 450GB) (1.8TB) which would be really easier to manage and won't have the write performance problem you will got with raid 5
0
 
LVL 18

Expert Comment

by:BigSchmuh
ID: 24203056
Thanks !

By the way, which raid conf did you choose finally ?
0
 

Author Comment

by:devereandpartners
ID: 24203104
I made the entire Raid 5 Partition. In the Bios I then split into 2 virtual disk of 150Gig and 2.9TB.

During Windows setup I formatted the installed on the 150Gig Parition.

After installation I went into Disk Management and formatted the other parition as GPT and it used all the space. During installation windows just makes it MBR which doesn't support more then 2TB as stated.

Thanks again for you help!
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

This article is an update and follow-up of my previous article:   Storage 101: common concepts in the IT enterprise storage This time, I expand on more frequently used storage concepts.
The article will include the best Data Recovery Tools along with their Features, Capabilities, and their Download Links. Hope you’ll enjoy it and will choose the one as required by you.
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…

584 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question