There does not appear to be enough disk space to allow for the RAID Rebalancing necessary to complete tier redundancy modification. You should add more disk space before proceeding. You can also free up space for RAID Rebalancing by deleting volumes, however it can take 7 days or more for the space allocated for those volumes to become available for use by RAID Rebalance.
Select Manage Disks to add disks to this disk folder. The amount of space available in the disk folder will then be reevaluated to determine if there is enough space for RAID Rebalance to succeed.
Select Cancel if you do not wish to proceed with tier redundancy modification at this time.
In order to complete tier redundancy modification, a RAID Rebalance must be performed. During the RAID Rebalance, detailed volume statistics and data progression reports will be unavailable.
Depending upon the amount of data on your system, RAID Rebalancing may take several days. RAID Rebalancing moves the lowest scoring RAID Devices first; beginning with the smallest RAID Devices. RAID Rebalancing takes longer when the system is running low on space, or when temporary devices must be created to allow for the replacement of existing devices. RAID Rebalancing has the potential to fail or deadlock when moving some RAID devices. If this occurs, it may be necessary to add more disk space to the system to allow RAID Rebalancing to complete.
See the Compellent User Guide for additional information and illustrations of RAID Rebalancing.