Reconfiguration Of Virtual Disks on the PowerEdge RAID Controller (PERC) H310, H710, H710P, and H810

Reconfiguration Of Virtual Disks on the PowerEdge RAID Controller (PERC) H310, H710, H710P, and H810



Article Summary: This article provides information on reconfiguration of virtual disks on the PowerEdge RAID Controller (PERC) H310, H710, H710P, and H810


An online virtual disk can be reconfigured in ways that expand its capacity and/or change its RAID level.

Warning: Always create a validated backup of your data before starting any action. The time of conversion is critical and by external influences (power failure, turning off the server, HD failure, etc.), it may result in data loss.
Note: Reconfiguring Virtual Disks typically impacts disk performance until the reconfiguration operation is complete.
Note: Spanned virtual disks such as RAID 10, 50, and 60 cannot be reconfigured.


Online Capacity Expansion (OCE) can be done in two ways. If there is a single virtual disk in a disk group and free space is available, the virtual disk´s capacity can be expanded within that free space. If a virtual disk is created and it does not use the maximum size of the disk group, free space is available. Free space is also available when a disk group´s physical disks are replaced by larger disks using the Replace Member feature. A virtual disk's capacity can also be expanded by performing an OCE operation to add more physical disks.

RAID Level Migration (RLM) refers to changing a virtual disk´s RAID level. Both RLM and OCE can be done at the same time so that a virtual disk can simultaneously have its RAID level changed and its capacity increased. When a RLM/OCE operation is complete, a reboot is not required. For a list of RLM/OCE possibilities, see table below. The source RAID level column indicates the virtual disk RAID level before the RLM/OCE and the target RAID level column indicates the RAID level after the operation has completed.

Note: If the controller already contains the maximum number of virtual disks, you cannot perform a RAID level migration or capacity expansion on any virtual disk.
Note: The controller changes the write cache policy of all virtual disks undergoing a RLM/OCE to Write-Through until the RLM/OCE is complete.


RAID Level Migration

Source RAID Level Target RAID Level Required Number of Physical Disks (Beginning) Number of Physical Disks (End) Capacity Expansion Possible Description
RAID 0 RAID 0 1 2 or more Yes Increases capacity
RAID 0 RAID 1 1 2 No Converts non-redundant virtual disk into a mirrored virtual disk by adding one disk.
RAID 0 RAID 5 1 or more 3 or more Yes At least one drive needs to be added for distributed parity data.
RAID 0 RAID 6 1 or more 4 or more Yes At least two drives need to be added for dual distributed parity data.
RAID 1 RAID 0 2 2 or more Yes Removes redundancy while increasing capacity.
RAID 1 RAID 5 2 3 or more Yes Maintains redundancy while doubling capacity.
RAID 1 RAID 6 2 4 or more Yes Two drives are required to be added for distributed parity data.
RAID 5 RAID 0 3 or more 3 or more Yes Converts to a non-redundant virtual disk and reclaims disk space used for
distributed parity data.
RAID 5 RAID 5 3 4 or more Yes Increases capacity by
adding disks.
RAID 5 RAID 6 3 or more 4 or more Yes At least one drive needs to be added for dual distributed parity data.
RAID 6 RAID 0 4 or more 4 or more Yes Converting to a non-redundant virtual disk and reclaiming disk space used for distributed parity data.
RAID 6 RAID 5 4 or more 4 or more Yes Removing one set of parity data and reclaiming disk space used for it.
RAID 6 RAID 6 4 5 or more Yes Increases capacity by adding disks.

Note: The total number of physical disks in a disk group cannot exceed 32.
Note: You cannot perform RAID level migration and expansion on RAID levels 10, 50, and 60.



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Article ID: SLN156106

Last Date Modified: 08/22/2016 08:52 PM


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