DELL MD3220 사용자 설명서

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Configuration: Disk Groups and Virtual Disks
Changing the RAID Level of a Disk Group
Changing the RAID level of a disk group changes the RAID levels of every 
virtual disk that comprises the disk group. Performance might be slightly 
affected during the operation.
Guidelines to change the RAID level of a disk group:
• You cannot cancel this operation after it begins.
• The disk group must be in Optimal status before you can perform this 
operation.
• Your data remains available during this operation.
• If you do not have enough capacity in the disk group to convert to the new 
RAID level, an error message appears, and the operation does not 
continue. If you have unassigned physical disks, use the Disk Group>> 
Add Free Capacity (Physical Disks) option to add additional capacity to 
the disk group. Then retry the operation.
To change the RAID level of a disk group:
In the AMW, select the Logical tab and select a disk group.
Select Disk Group Change RAID Level.
Select the appropriate RAID level and click Yes to confirm the selection.
The RAID level operation begins.
Restricted Mappings
Many hosts are able to map up to 256 logical unit numbers (LUNs) (0 to 255) 
per storage partition. However, the maximum number of mappings differs 
because of operating system variables, failover driver issues, and potential 
data problems. The hosts listed in the table have these mapping restrictions.
If you try to map a virtual disk to a LUN that exceeds the restriction on these 
operating systems, the host is unable to access the virtual disk.
Guidelines when you work with host types with LUN mapping restrictions:
Operating System
Highest LUN
Windows Server 2003 and Windows server 2008
255
Linux
255
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