A reconstruction occurs when you change the RAID level of an array or add a physical drive to an existing array. RAID level migration changes the array from one RAID level to another. Online capacity expansion is the addition of hard disk drives to increase storage capacity. You can perform a reconstruction while the system continues to run, without having to reboot. This avoids downtime and keeps data available to users.
Performing a RAID level migration on a clustered system will change the system to non-clustered mode, causing a cluster mismatch error if the system is rebooted.
Perform the following steps to reconstruct a drive:
A window entitled "Reconstructables" displays. This contains the logical drives that can be reconstructed. You can press <F2> to view logical drive information or <Enter> to select the reconstruct option.
The next reconstruction window displays. The options on this window are <spacebar> to select or deselect a drive, <Enter> to open the reconstruct menu, and <F3> to display logical drive information.
The menu items are RAID level, stripe size, and reconstruct.
You are prompted to start the reconstruction. A progress bar for the reconstruction displays.
As I understand it, this is a limitation of the MBR table under NTFS, you can use dispart to convert to a GUID partition table see the "convert GPT" command documentation in diskpart's manuals.
Ref kb/919117 kb/302873
For the next time, would be best to run a manually started Patrol Reads along with a CC before the expansion. A Consistency Check checks only the parity info, Patrols Reads check the disk surface for errors. The greatest danger of array loss comes during a rebuild, as all the sectors are checked by the adapter. During normal use the adapter does NOT check sectors which do not contain data, so errors can build up in unused areas of the disk. If multiple errors build up, it is a good chance the raid adapter will fail the array in the rebuild process. With an array this size make sure Patrol reads run often, either automatically or manually scheduled.
Not to my knowledge, it appears that you're going to need some down time to do a rebuild of the server.
Is there a way to view the Process % of the reconstruction process? We have added 2 extra drives to a RAID5 array 20 hours ago and it is still running.