User's Manual

Virtual Disks 215
For related information, see Considerations for CERC SATA1.5/6ch and
CERC SATA1.5/2s Controllers When Physical Disks are Shared by
Redundant and Non-Redundant Virtual Disks.
Virtual Disk Considerations for PERC S100, S110, and S300 Controllers
The following considerations apply when creating virtual disks:
• S pace 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
non-redundant virtual disks, only the redundant virtual disks are rebuilt.
For information on controller limitations, see Number of Physical Disks per
Virtual Disk.
Exceptions to One Physical Disk Limitation for Concatenated Virtual Disks on CERC
SATA1.5/6ch and CERC SATA1.5/2s Controllers
When using the Storage Management Create Virtual Disk wizard, you can
only use one physical disk to create a concatenated virtual disk. The Create
Virtual Disk wizard imposes this limitation in order to protect the
concatenated virtual disk against potential data loss in the event that you
reconfigure the virtual disk to a RAID 1 mirror. For possible reconfiguration
scenarios, see Starting and Target RAID Levels for Virtual Disk
Reconfiguration and Capacity Expansion.
There are other situations, however, where you can create a concatenated
virtual disk using more than one physical disk. For example, if you perform a
Split Mirror or an Unmirror on a RAID 1-concatenated virtual disk that has
four or more physical disks, then the resulting concatenated virtual disks have
two or more physical disks. For information about splitting and unmirroring
RAID 1-concatenated virtual disks, see Split Mirror and Unmirror.
When using the controller BIOS, you can create a concatenated virtual disk
using more than one physical disk.
Virtual Disk Considerations on Linux
On some versions of the Linux operating system, the virtual disk size is
limited to 1TB. Before creating a virtual disk that is larger than 1TB, you
should make sure that your operating system supports this virtual disk size.