User's Manual

248 Virtual Disks
– Select RAID 10 for striping over mirror sets. This selection groups n
disks together as one large virtual disk with a total capacity of (n/2)
disks. Data is striped across the replicated mirrored pair disks. When a
disk fails, the virtual disk continues to function. The data is read from
the surviving mirrored pair disk. This feature provides the best failure
protection, read and write performance. Your system must have at
least four disks to use RAID 10.
– Select
RAID 50 to implement striping across more than one span of
physical disk s. RAID 50 groups n*s disks as one large virtual disk with
a capacity of s*(n-1) disks, where s is the number of spans and n is the
number of disks within each span.
– Select
RAID 60 to implement striping across more than one RAID 6
span. RAID 60 Groups n*s disks as one large virtual disk with a
capacity of s*(n-2) disks, where s is the number of spans and n is the
number of disks within each span. RAID 60 provides increased data
protection and better read performance, but slower write performance.
2 Type a name for the virtual disk in the Name text box.
The virtual disk name can contain only alphanumeric characters as well as
spaces, dashes and underscores. The maximum name length depends on
the controller. In most cases, the maximum length is 15 characters. The
name cannot start with a space or end with a space.
It is recommended that you specify a unique name for each virtual disk. If
you have virtual disks with the same name, it is hard to differentiate the
alerts generated for these virtual disks.
NOTE: The CERC SATA1.5/2s controller does not allow you to specify a name for
concatenated virtual disks. The concatenated virtual disk is created with a default
name.
3 Type the size for the virtual disk in the Size text box. The virtual disk size
must be within the minimum and maximum values displayed near the
Size text box. For information on how the maximum virtual disk size is
calculated, see Calculation for Maximum Virtual Disk Size and the Create
Virtual Disk Express Wizard.
In some cases, the virtual is slightly larger than the size you specify. The
Create Virtual Disk wizard may round up the size of the virtual disk to
avoid rendering a portion of the physical disk space unusable.