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My organization previously set up an SBS Server 2008 on a Dell T300.
This was a small setup with 2 x 160 GB disks in a RAID 1 mirror.

We are running short on disk space. I would like to extend the diskspace by replacing both disks with larger ones.

Will it be sufficient to reconfigure the server by a simple restore from a full backup? Has anyone done something similar that could give some feedback?

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Are you using Windows RAID or the RAID built into the Dell? It really make a big difference. In my experience with dell raid cards (various PERC raid cards, both T and R serious), they'll simply refuse to allow you to swap the bigger disk into the existing logical volume. If you want to try something like that, then create a second logical volume on the same raid card, with the larger disks, (carefully) copy over the filesystems, then try your luck resizing them with expande2fs or something similar.

This suggestion is only for if you're using a RAID instance configured through a Dell hardware raid card.

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You can do a backup and restore to a new RAID volume on 2 new disks as has been suggested, or, if your RAID controller supports expanding, you can remove one disk and place one NEW disk and let the mirror rebuild. Then remove the 2nd original disk and put in the 2nd NEW disk and let it rebuild again. Now you expand the virtual disk in the RAID controller and let that update/sync, then expand the volume(s) in Windows 2008.

Backup all data first. Verify the RAID controller supports this before you take any action. It is possible that it does support it but requires a certain firmware/driver first.

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What you should do is purchase 2 larger disks that will suit your needs. Swap only 1 of the disks out while the other one remains and let the array re-build. When the array has been rebuilt on the other disk then put the other larger disk in and that will rebuild against the first larger disk that you put in. Once your array has been enlarged, resize the partition with the diskpart utility

Before you do any work make sure your backups are in good order.

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I did had this idea but, from different readings, I am afraid that this will clone the existing paritions on the new drive without extending the overall space available.... Did you actually run this process on a Windows sever ? – H.DELESALE Sep 26 '11 at 16:26
Yes. As long as you have partitioned your server into system and data partitions, you can extend your data partition using the diskpart utility.… Add the new disks and then extend the partition. – DKNUCKLES Sep 26 '11 at 16:42
I'm pretty sure the OP will need to extend the array before he extends the volume. The RAID controller isn't going to extend the array on it's own just because a larger disk is inserted. – joeqwerty Sep 26 '11 at 16:44
See my most recent comment - my answer has also been edited. – DKNUCKLES Sep 26 '11 at 16:49

You can do all this "resync raid to larger drive" stuff but its fairly complicated and potentially very risky, if something goes wrong you have a MASSIVE headache as you are playing around with live data and can take hours to get the system back to its original state, its really not a good idea. ive been hurt when playing around with working raid setups before, its not fun when things go wrong...

Make a full backup of the OS, image it with Norton ghost or clonezilla to an external drive.

remove the 2 drives and take both of the drives to a safe place in another room so they wont be knocked over or more importantly because then you wont be tempted to use it in some "what happens if i try doing this" scenario like i would and loose all your data.

Plug in new drives, setup raid as usual and re-image the disks and resize them if you need to. And if everything goes wrong and you accidentally made a backup of your 160GB drive of cat pictures labeled "SYSTEM DRIVE" for some reason and your boss is asking where his file shares and email are you can still go to the other room, swap the drives and start the system as usual without even a single lost cat picture. Able to delay or reschedule the drive migration for another day without a single fear.

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