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Replacing drives in RAID 1

Posted on 2003-12-09
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I have an Adaptec SCSI RAID controller with two Seagate 9.11 GB drives mirrored as RAID 1. I want to replace both of these drives with larger capacity. I have two partitions C: for Win2K and D: for data.

Can I install one new drive as a spare and change it to be the mirror, then remove the original mirror, then make the new drive the primary, and then install the second new drive as the mirror?

Or is there a better way to replace the drives and preserve all OS and data?
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Question by:vogtster
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by:Luc Franken
ID: 9906909
Hi vogtster,

I think creating an image with a program like Norton Ghost, then change the drives (create a mirrored array again) then write back the image is the easiest solution to do this. Or you can add the two drives to start with, then use Ghost to clone the original array onto the new one. Then set the SCSI Bios to boot from the newly created array. Afterwards, after you've found that everything is running fine, you can use the old drives for extra storage.

Greetings,

LucF
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by:Andrewhsia
ID: 9908545
I agree, though I prefer Power quest 2002.
If you swap a large one for one of the small ones, it will create it as the same size as the small one.
so if you change one of the 9gb drives for a 36gb drive, it will make the drive a 9gb drive. So it does you no good. After you change the other one, then you would have to use like partion magic to make the partion larger.
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raybass earned 500 total points
ID: 9910282
I feel the best way is to do this:

1. Break the Mirror in the SCSI Bios, then remove one drive.  Make sure you can boot.
2. Using Symantec Ghost (not PQ), Ghost from the 9 gig to the new, larger hard drive.  It will maximize the capacity of the disk this way.
3. Make sure you can boot from the new larger drive.
4. Add the second larger hard drive and reconstruct the mirror in the SCSI Bios.
5. Make sure you can boot.  :)  Otherwise, you still have that 9 gig scsi you removed in the first step.

Ghost is your best bet because you can resize the partitions while moving them.  When you ghost, it will actually come up with a dialog box asking what size to make each partition, so you can keep your C the same while giving all the extra space to D, or vice versa, or increase them both.

Good Luck!
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by:Luc Franken
ID: 9910388
>After you change the other one, then you would have to use like partion magic to make the partion larger.
Partition magic can't be used on server versions of windows and this creates one extra step of failure. So I really recommend my way. Just make sure you keep the 9.11 GB drive alive until you're sure that everything works fine.
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Author Comment

by:vogtster
ID: 9912710
I like raybass's solution (that's what I was trying to describe in my original question) but I have read that Ghost does not support NTFS. My question is what NTFS function does it not support? Ghost most likely bit copies one drive to another, so NTFS is not an issue. Could it be that Ghost can't read or write NTFS when doing something less than a whole disk copy?
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by:Luc Franken
ID: 9912732
>>I have read that Ghost does not support NTFS.
Where did you read that?

http://www.symantec.com/sabu/ghost/ghost_personal/sys_req.html
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by:Luc Franken
ID: 9912777
I hope you don't use dynamic drives: http://tinyurl.com/ylj9
For information about cloning a server: http://tinyurl.com/yljj
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Author Comment

by:vogtster
ID: 9913100
A user review from 11/2002. Maybe it was an older version.

http://www.pcmag.com/article2/0,4149,28498,00.asp
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by:andyalder
ID: 9913293
There is an easier way which probably works with your controller; replace one drive with bigger one, let it rebuild the array - may take quite a while, then replace the other drive with bigger one. Now in drive manager you'll probably see a bigger drive so you can use the rest under a different drive letter. No downtime this way and it works on most RAID controllers. Don't do this with dynamic disks either.
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