Quick Reference Guide

88 RAIDCFG
-ctrl -ac=cvd
-c=id -ad=
ch:targ,ch:targ, ...
[or ch:targ:encl,...]
or
controller action=
createvdisk
controllerid=id
adisk=
channel:target:lun,
channel:target:lun,...
[or channel:target:
enclosure,...]
-rp
or
readpolicy
ra, ara, nra, rc, nrc Sets the SCSI read policy for the virtual disk. Specify
the SCSI read policy for the logical drive. The valid
arguments are:
ra — (read-ahead) The controller reads sequential
sectors of the disk when seeking data.
ara — (Adaptive Read-Ahead) The controller initiates
read-ahead only if the two most recent read requests
accessed sequential sectors of the disk. If subsequent
read requests access random sectors of the disk, the
controller reverts to No-Read-Ahead policy. The
controller continues to evaluate whether or not read
requests are accessing sequential sectors of the disk
and can initiate read-ahead if necessary.
nra — (No-Read-Ahead) The controller does not read
sequential sectors of the disk when seeking data.
NOTE: The ra, ara, and nra options are supported on the
following RAID controllers only:
• PERC 3/DC, PERC 3/QC, PERC 3/Di, PERC 3/SC
• PERC4/SC, PERC 4/DC, PERC 4/Di, PERC 4/IM,
PERC4e/DC, PERC 4e/Di, and PERC 4e/Si
• PERC 5/E Adapter
NOTE: The PERC 4/IM controller has a fixed set of read,
write, and cache policies. If you set any of these policies
while creating a virtual disk, your settings will be ignored.
rc — (Read-Caching) Enables read caching.
nrc — (No-Read-Caching) Disables read caching.
NOTE: The rc and nrc options are supported on the
following RAID controllers only: CERC SATA 1.5/CH and
PERC 3/Di.
The -rp option is optional and can be added to
the command line in any order after the
mandatory option combination.
NOTICE: If the controller is changed from SCSI to
RAID mode, expect data loss to occur. Back up any
data you want to save before changing the modes.
Table 4-4. Creating Virtual Disks (continued)
Mandatory Options
and Arguments
Optional
Parameters
Valid Parameter
Arguments
Description