Solved

Changing Drive Sizes in an Existing Array

Posted on 2007-04-05
3
227 Views
Last Modified: 2010-04-19
I have a Dell CERC ATA100/4-channel RAID Controller(LSI Logic) in a server.  The OS is Win 2003 SBS.  There were two 80-gig drives in a RAID 1 configuration; one drive failed and was removed.  I now only have the single 80 gig drive.  I plan to install 3- 160 gig drives for a new RAID 5 array with a 4th as a hot spare.  Is it possible to create the new array without re-installing the OS?  And, if so, how would one go about that - the documentation I have read has not addressed this circumstance, at least in a way that is clear to me.  I thought that I could add 3 of the new drives and the array could be rebuilt with all 4 drives (that's 1 80 and 3-160 gigs).  Then pull the 80 and let the array rebuild itself as a 3 drive RAID 5.  Then add the hot spare.   Any guidance and help would be appreciated, I don't have much experience with RAID configuration.  Thanks Brent
0
Comment
Question by:brentokc
3 Comments
 
LVL 63

Expert Comment

by:SysExpert
ID: 18862166
I do not think it will work that way.

You can not convert a single or RAID 1 to RAID5 in most controllers.

You can certainly try, but make sure that you have a full backup of the 80 GB drive ( preferably on TAPE and perhaps also a spare Imaged drive that has been tested ).

I hope this helps !
0
 
LVL 14

Accepted Solution

by:
Hedley Phillips earned 500 total points
ID: 18862871
You can't change the Raid type on the fly. If it is Raid 1 it has to stay Raid 1 unless you start from scratch.

The other point to note is that if you put a 160 gb drive into an array with an 80gb drive. The array will only use 80gb of it. That is, the array always uses the smaller size & speed of drives. So you would effectively have all 80gb drives in there, even if you let it all rebuild and then pulled the 80gb. Waste of space.

I would buy something like Norton Ghost, ghost the entire system onto a back up drive (if you don't have one check out the Western Digital MyBooks) then rebuild the array from scratch using just the 3 160gb drives (plus the hot spare) and then put the OS back on from the ghost image.
0
 
LVL 3

Expert Comment

by:Comply
ID: 18870401
You will have to back-up then reinstall the OS.

You will have to chose which RAID you want 0, 0+1, 3 or 5 once its built install the OS then recover your backup.

All these work best if all the drives are the same Size, Type, and Mfg for best performance.
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

In this article you will get to know about pros and cons of storage drives HDD, SSD and SSHD.
Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
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 Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.

864 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

25 Experts available now in Live!

Get 1:1 Help Now