User's Manual

152 Using the Storage Management Service
[writepolicy=<wb| wt| wc| nwc>] Parameter (Optional)
Different controllers support different write policies. Table 6-21 indicates
how to specify the [writepolicy=<wb| wt| wc| nwc | fwb>] parameter for
each of the write policies.
[name=<string>] Parameter (Optional)
Use this parameter to specify a name for the virtual disk. For example:
name=VirtualDisk1
NOTE: The CERC SATA 1.5/2s controller does not allow you to specify a virtual disk
name. The virtual disk will be created with a default name.
[spanlength=<n>] Parameter (Required for RAID-50)
Use this parameter to specify the number of physical disks to be included in
each stripe.
This parameter only applies to RAID-50 virtual disks. If you are
not creating a RAID-50 virtual disk, do not specify this parameter. For
example:
spanlength=3
Example Syntax
For example, you may want to create a RAID-5 virtual disk on a PERC 3/QC
controller. See Dell OpenManage Online Help for information on read, write,
and cache policies are supported by this controller. For example, to create a
virtual disk with the following read, write, and cache policy:
• Read-ahead
• Write–through caching
• Cache I/O
Table 6-21. Write Policy Parameters
Write Policy writepolicy=wb | wt | wc | fwb | nwc Parameter
Specification
Write–back cache writepolicy=wb
Write–through cache writepolicy=wt
Write cache writepolicy=wc
Force write back writepolicy=fwb
No write cache writepolicy=nwc