Quick Reference Guide

162 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:
• PERC4/SC, PERC 4/DC, PERC
4/Di, PERC 4/IM, PERC4e/DC,
PERC 4e/Di, PERC 4e/Si
• PERC 5/E Adapter, PERC 5/I
Integrated, PERC 5/i Adapter
• PERC 6/i Integrated, PERC 6/i
Adapter, PERC 6/E Adapter
Table 4-4. Creating Virtual Disks (continued)
Mandatory
Options and
Arguments
Optional
Parameters
Valid Parameter
Arguments
Description