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You cannot create virtual disks on a set of disks migrated from earlier software RAID versions and configured with
multiple RAID levels.
Related Links
Channel Redundancy And Thermal Shutdown
Virtual Disk Task: Reconfigure (Step 1 of 3)
Virtual Disk Considerations For PERC S100, S110, And S300 Controllers
The following considerations apply when creating virtual disks:
• Space allocation — When you create a new virtual disk, the PERC S100, PERC S110, and S300 controllers
allocate the largest area of free space on the physical disks to the new virtual disk.
• Rebuilding data — If a failed physical disk is used by both redundant and nonredundant virtual disks, only the
redundant virtual disks are rebuilt.
NOTE: For information on controller limitations, see Number Of Physical Disks Per Virtual Disk.
Related Links
Number Of Physical Disks Per Virtual Disk
Virtual Disk Considerations On Systems Running Linux
On some versions of the Linux operating system, the virtual disk size is limited to 1 TB. Before creating a virtual disk that
is larger than 1 TB, you should make sure that your operating system supports this virtual disk size. The support provided
by your operating system depends on the version of the operating system and any updates or modifications that you
have implemented. In addition, you should investigate the capacity of your peripheral devices to support a virtual disk
that is larger than 1TB. For more information, see your operating system and device documentation.
Number Of Physical Disks Per Virtual Disk
There are limitations on the number of physical disks that can be included in the virtual disk. These limitations depend on
the controller. When creating a virtual disk, the controllers support some stripes and spans (methods for combining the
storage on physical disks). Since, the number of total stripes and spans is limited, the number of physical disks that can
be used is also limited. The limitations on stripes and spans affect the possibilities for concatenation and RAID levels as
follows:
• Maximum number of spans affects RAID 10, RAID 50, and RAID 60.
• Maximum number of stripes affects RAID 0, RAID 5, RAID 50, RAID 6, and RAID 60.
• Number of physical disks in a mirror is always 2. This property affects RAID 1 and RAID 10.
If RAID 50 and RAID 60, you can use a greater number of physical disks than is possible for other RAID levels. RAID 10 on
a SAS controller with firmware version 6.1 can use a maximum of 256 physical disks. However, the number of
connectors on the controller imposes limitations on how many physical disks can be included in a virtual disk when
using RAID 10, RAID 50, or RAID 60. This is because only a limited number of physical disks can be physically attached to
the controller.
For information about the maximum number of physical disks supported by a virtual disk, see the virtual disk
specifications for the controller in Supported Features.
Related Links
Virtual Disk Considerations For PERC S100, S110, And S300 Controllers
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