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.
|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
|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.|
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Article ID: SLN156106
Last Date Modified: 08/22/2016 08:52 PM
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