Solved

How to Configure Raid 5 on Perc 6i

Posted on 2009-04-06
3
2,395 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 500 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

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

The 6120xp switches seem to have a bug when you create a fiber port channel when you have a UCS fabric interconnects talking to them.  If you follow the Cisco guide for the UCS, the FC Port channel will never come up and it will say that there are n…
Moving your enterprise fax infrastructure from in-house fax machines and servers to the cloud makes sense — from both an efficiency and productivity standpoint. But does migrating to a cloud fax solution mean you will no longer be able to send or re…
This video Micro Tutorial explains how to clone a hard drive using a commercial software product for Windows systems called Casper from Future Systems Solutions (FSS). Cloning makes an exact, complete copy of one hard disk drive (HDD) onto another d…
This video explains how to create simple products associated to Magento configurable product and offers fast way of their generation with Store Manager for Magento tool.

707 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

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now