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Expand Array with Spare Drive

Medium Priority
Last Modified: 2012-05-06
I have an older Compaq ML 350 Server.
We have a raid 5 array that has 4 drives on it, 1 of them is a spare.  Can i remove the drive from the array as a spare and readd it so that we will have more disk space?
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Sorry, its a Compaq ML 370.  
andyaldersaggar maker's framemaker
Distinguished Expert 2019

Probably. You will have to go into the Array Configuration Utility first and tell us which controller it has and whether it has a battery backed write cache enabler since some of the controllers do not allow online expansion without a battery. Generation number would help as well, there is a Gx printed on the front except for the Generation 1 servers.


Its a Smart Array 5300 controller on a Gen 1 server.    It has 2 battery packs which it states are ok.

Can i do this without losing any data that is currently on the raid 5 drives.    

I wanted to remove the spare, add it to the array to increase the size of the logical disk, then go to windows and add the extra space to my "e" drive.
saggar maker's framemaker
Distinguished Expert 2019
Yes, you can do all that online without data loss, although you should backup anyway.

First I would upgrade to the latest ACU from www.hp.com/#Support (select to download software and drivers and enter smart array 5300 as the product, then pick your OS)
Then in the ACU highlight the controller and you should see spares management in the right hand pane. Unassign the spare from any array it is associated with.
Then highlight the array you want to to add the disk to and expand array should appear in right hand pane. Click that and you can add the disk to array.
Then select the logical disk that e: is on and expand logical disk should appear so do that.
You have to select "save" after some of these operations, can't remember which.
Then quit the ACU and run diskpart.exe and follow the proceedure to extend a basic disk at http://support.microsoft.com/kb/325590/en-us

Warning, not that it applies to you but do not extend a disk that is less than 2TB to a size greater than 2TB because Windows can't cope with that.

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