Deployment Guide

Mandatory Options
and Arguments
Optional Parameters Valid Parameters
Arguments
Description
lun,
channel:target:
lun,...
[or
channel:target:
enclosure,...]
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 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 5/E Adapter, PERC 5/I Integrated,
PERC 5/i Adapter
• PERC 6/i Integrated, PERC 6/i Adapter,
PERC 6/E Adapter
• rc — (Read-Caching) Enables read
caching.
• nrc — (No-Read-Caching) Disables read
caching.
-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,...]
-sp or spanlength <number>
Creates a virtual disk comprised of the properties
supplied. The -sp option is optional and can be
added to the command line in any order after the
mandatory option combination.
NOTE: Spanlength is applicable only for
RAID 50 and RAID 60. The minimum
permissible spanlength value for RAID 50 is
3 and for RAID 60 is 4. The number of array
disks for creating a virtual disk should not
be a prime number and should be divisible
by the specified spanlength.
NOTE: For creating RAID 10, the PERC 9
firmware suggests the layout (number of
array disks) with uneven span (spans with
unequal number of array disks), though in a
span the number of disks remain even. For
example, for 32 disks, RAID 10 is created
with all the disks in one span and for 34
disks, RAID 10 is created with 16 disks in
one span and 18 disks in the other span.
For SCSI controllers, the value of LUN should
always be 0.
For SAS controllers, the value of enclosure can be
non-zero, in which case you must specify values
for channel, target, and enclosure.
-ctrl -ac=cvd
-
c=id -ad=
ch:targ,ch:targ,
-ssz or
stripesize
<number>
Sets the stripe size for the virtual disk. The stripe
size is the amount of array disk space used on each
array disk included in the stripe. A valid argument is
a number that is less than the size of the virtual
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