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Dell PowerVault DP500 / NF500

We have a Dell PowerVault NF500 with a 2 channel SAS raid controller and 6 port hot swap backplane. In it's current configuration there are four 1Tb SATA drives in a raid 5 array and I want to add two more drives. I installed two new 1Tb drives in slots 5 and 6 but they are on channel 2 of the raid controller. Is it possible to have all six slots on one channel on the controller? Can I expand the existing array across 2 channels on the controller? With the current configuration I did not see any options for adding to the existing array in the controller bios.
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"Is it possible to have all six slots on one channel on the controller?"

No, not in this system.

"Can I expand the existing array across 2 channels on the controller?"

Yes, the controller will handle this just fine.

"With the current configuration I did not see any options for adding to the existing array in the controller bios. "

You cannot do this from the controller BIOS (CTRL-R).  You must do this using the OpenManage software ... OMSA from the OS or a bootable OMSA disk.  

What OS are you using?
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The OS is Windows Storage Server 2003 SP2. I was not able to figure out how to expand the existing array in OMSA. Maybe I need to upgrade the OMSA installation?
What version do you have?  I think it should be supported in all versions.

Go to Storage, PERC, Virtual Disks, and select Reconfigure from the dropdown of Available Tasks for the RAID 5.
OMSA is Version 5.4.0. I have 5 virtual disks created and there is no reconfigure option in the drop down for any of them. Available options are; Delete, Check Consistency, Assign/Unassign HS, Blink, Unblink, Rename, Change Policy, Slow Initialize, Fast Initialize.
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Understood. Three of the virtual disks are temporary storage and can be deleted and re-created with no issues. I have applications installed on the second virtual disk, drive D: for the OS. If I back that drive up and delete it, then do the raid expansion, then re-create it and restore the applications will the OS have any issues with those apps?
I don't think Windows will just pick them up again, but I'll be honest - I don't know what Windows will do with those folders missing/being restored.
The only app on that drive is Arcserve Backup and I am inclined to think that if I stop all the services during this process then there should be no problems. Or am I leaning the wrong way?

Although it does use SQL server 2005, which is also installed on that drive...
Although my "hunch" would also be that it would pick it up ok, I don't know what kind of signature/ID Windows might have assigned to those program folders and/or if that would be preserved by a backup/restore.