Solved

Configuring RAID 5 Dell Poweredge 2950

Posted on 2011-03-17
11
1,019 Views
Last Modified: 2012-06-22
Hello,
Can someone please help me with configuring RAID 5 in a Dell Poweredge 2950?

I have 2 drives configured RAID 1 (running fine.)

I add 4 drives (2TB each), thinking that I should have about 6TB, but when I went into Windows 2008 Disk Manager to initialize, it only showed 3725.00, instead of 5,8xx (6TB).

This is what I have in the RAID configuration:

Disk Group 1 (this is for RAID 5)
under Physical Disks, I have 3 drives.
under Hot spares, I have 1 drive (Dedicated)

I must did something wrong, experts, please help.
0
Comment
Question by:Paul-AC
  • 6
  • 4
11 Comments
 
LVL 3

Expert Comment

by:EvaUnit01
ID: 35157319
The hot spare, that is your problem. You setup the Raid 5 volume to use one of the 4 HDDs as a hot spare, so it is not included in the volume you see in disk management. Hot spares are just there waiting to kick in if a drive fails.
0
 

Author Comment

by:Paul-AC
ID: 35157406
So what you're saying is that I should setup all 4 of them as RAID 5 and Don't use Hot spare?
0
 

Author Comment

by:Paul-AC
ID: 35157418
Is so, then what does Hot spare mean?
0
 
LVL 3

Expert Comment

by:EvaUnit01
ID: 35157467
Yes, exactly. RAID 5 setup already knows that is one drive fails to alert you and then you may replace the drive. All functionality continues fine, this is the way RAID 5 is setup to work. Hot spares are something independent of any RAID configuration. They are there to do exactly what they say, they are a spare, just sitting there waiting to pop in place in case a physical drive fails.

That is why when you are doing RAID 5 you use the formula of: n-1= total volume space  That minus 1 is for the space needed to spread the data across the other disks in the event a drive fails.
0
 

Author Comment

by:Paul-AC
ID: 35157499
Thanks, will try it right now.
0
Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

 

Author Comment

by:Paul-AC
ID: 35157609
After removing the Hot spare drive, it said "Ready" under PD Mgmt.
But I don't see the that drive anywhere under "VD Mgmt.
please help, sorry, never done this before.
0
 
LVL 3

Accepted Solution

by:
EvaUnit01 earned 450 total points
ID: 35157648
right, you need to also break the last RAID 5 config and start a brand new config this time including the 4th drive in the RAID 5.
0
 

Author Comment

by:Paul-AC
ID: 35157751
Thank you so much for your help. that did it.

It's a good thing that I don't haven't using RAID 5 yet, other it would be a mess.

one more question if you don't mind, (since you know the stuff).
Can I do Hot Swap on my RAID 1 (the first 2 drives) when 1 of them is down?

Thanks again for your help.
0
 
LVL 3

Expert Comment

by:EvaUnit01
ID: 35157819
This depends, also the same applies o the RAID 5, you will need to swap a drive in the event one fails. If this RAID is being controlled via a hardware RAID controller card then yes, usually the controller card has the capability to do a hot swap. Check the manual of the controller card, if it is a software raid then it depends, you would need to read the manual of the motherboard and verify with the manufacture.
0
 
LVL 32

Assisted Solution

by:PowerEdgeTech
PowerEdgeTech earned 50 total points
ID: 35157964
To clarify ... yes, all drives in a 2950 will be hot-swappable.

Where you had nothing on your 3-disk RAID 5, it was easy to wipe it out and create a new 4-disk RAID 5, but if you had had data on it and didn't want to - or couldn't - wipe it out, you can Reconfigure your 3-disk RAID 5 to a 4-disk RAID 5 without data loss through OMSA, Storage, PERC, Virtual Disks, Reconfigure from the dropdown menu for the RAID 5.
0
 

Author Closing Comment

by:Paul-AC
ID: 35166939
Thank you guys
0

Featured Post

Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

INTRODUCTION The purpose of this document is to demonstrate the Installation and configuration, of the HP EVA 4400 SAN Storage. The name , IP and the WWN ID’s used here are not the real ones. ABOUT THE STORAGE For most of you reading this, you …
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.
This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…

911 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

23 Experts available now in Live!

Get 1:1 Help Now