User's Manual

200 Virtual Disks
• Rebuilding data —An failed physical disk that is used by both redundant
and non-redundant virtual disks cannot be rebuilt. Rebuilding a failed
physical disk in this situation requires deleting the non-redundant virtual
disk.
•
Disk Group Concept Consideration for S110 —Disk grouping is a logical
grouping of disks attached to a RAID controller on which one or more
virtual disks are created, such that all virtual disks in the disk group use all
of the physical disks in the disk group. The current implementation
supports the blocking of mixed disk groups during the creation of logical
devices.
Physical disks are bound to disk groups, therefore, there is no RAID level
mixing on one disk group.
Storage Management Server implements disk group concept during virtual
disk creation. Functionally, after a group of physical disks are used to create
their first virtual disk, unused space in the disk is used only to expand
virtual disk, or create new virtual disks in the unused space. The virtual
disks have identical RAID level.
Also, existing mixed configuration are not affected. However, you cannot
create mixed configurations.
You can read or write to the virtual disks, rebuild, and delete the disks.
You cannot create virtual disks on a set of disks migrated from earlier
Software RAID versions and configured with multiple RAID levels.
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
.