Dell Compellent Series 30 - Manual (Page 131)

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Rebalancing RAID
RAID Rebalance may be in one of the following states:
• Rebalance Not Needed - RAID Rebalance is not currently running and no classes of
storage report requiring rebalance.
• Rebalance Needed - One or more classes of storage on the system reports requiring
a rebalance.
• In Progress - RAID Rebalance is currently in progress.
• Final Pass In Progress - RAID Rebalance is completing its final pass.
• Rebalance Complete - RAID Rebalance has been completed successfully.
• Rebalance Failed - RAID Rebalance has been performed, but one or more classes of
storage still reports requiring a rebalance.
• Rebalance Stopping - A user has requested that RAID Rebalance be stopped.
• Rebalance Stopped - RAID Rebalance has been stopped prematurely by a user.
RAID Rebalance Options
The following options may appear depending upon the current state of RAID Rebalance:
• Rebalance Now - Starts the RAID Rebalance process.
• Schedule Rebalance - Allows RAID Rebalance to be scheduled for a later time.
• Stop Rebalance - Stops the RAID Rebalance process after the current pass. This may
take several minutes.
• Close - Closes the RAID Rebalance wizard. If a RAID Rebalance is in progress, it will
continue in the background until complete.
RAID Rebalance Information
The following information is provided when a RAID Rebalance is in progress:
• Rebalance Start Time - The time at which the RAID Rebalance was started.
• Estimated Completion Time - The estimated time at which the RAID Rebalance will
be completed. This information is not available until the RAID Rebalance has been
running for a sufficient amount of time.
• Percent Complete - The percent of allocated space which has been rebalanced.
• Space Remaining - The amount of space remaining to be rebalanced of the initial
amount of space needing rebalance.
Depending upon the amount of data on your system, RAID Rebalancing may take several
days or even weeks. 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.
Although RAID Rebalancing is a background process, depending on the size and activity
of your system, Rebalancing can take weeks. Schedule it accordingly.