https://community.hpe.com/t5/disk-enclosures/array-expansion/m-p/3904151#M22344 Hello Karl,<BR /><BR />This depends on th array controller you use.<BR />With the latest controllers you can expand online. So you can add 1 disk to expand the existing array. (option will show in ACU if the disk is added to the system).<BR />If it is only the system partion on that logical drive it will be an backup/restore action. Or using a third part util like acronis / partition magic.<BR /><BR />With regards,<BR /><BR />Otto Mon, 27 Nov 2006 18:09:30 GMT otto warlich 2006-11-27T18:09:30Z https://community.hpe.com/t5/disk-enclosures/array-expansion/m-p/3904150#M22343 I have an ML370 G2 running 3-36Gb drives that are Raid 5 with 1 logical drive. I would like to add another 36Gb drive to the array and then expand the existing logical drive to include the space the new drive adds.<BR />Can I have a 4 drive raid 5 array or does it have to be 5 drives?<BR />What are the steps you take using the ACU to do this process?<BR />My existing logical drive is also the system partition. Is this a problem? Mon, 27 Nov 2006 12:04:23 GMT https://community.hpe.com/t5/disk-enclosures/array-expansion/m-p/3904150#M22343 Karl Seidl 2006-11-27T12:04:23Z https://community.hpe.com/t5/disk-enclosures/array-expansion/m-p/3904151#M22344 Hello Karl,<BR /><BR />This depends on th array controller you use.<BR />With the latest controllers you can expand online. So you can add 1 disk to expand the existing array. (option will show in ACU if the disk is added to the system).<BR />If it is only the system partion on that logical drive it will be an backup/restore action. Or using a third part util like acronis / partition magic.<BR /><BR />With regards,<BR /><BR />Otto Mon, 27 Nov 2006 18:09:30 GMT https://community.hpe.com/t5/disk-enclosures/array-expansion/m-p/3904151#M22344 otto warlich 2006-11-27T18:09:30Z