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Features 25
Reconfiguration of Virtual Disks
An online virtual disk can be reconfigured in ways that expands its capacity
and/or change its RAID level.
NOTE: Spanned virtual disks such as RAID 10, 50, and 60 cannot be reconfigured.
NOTE: Reconfiguring Virtual Disks typically impacts disk performance until the
reconfiguration operation is complete.
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 2-1. 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.