Reference Guide

Mandatory
Options and
Arguments
Optional
Parameters
Valid Parameters
Arguments
Description
:
enclosure,...]
-wp or
writepolicy
wb, wt, wc, nwc,
fwb
Sets the write policy for the virtual disk.
The valid arguments are:
• wb — Write-Back caching sets the
controller to send a write-request
completion signal as soon as the
data is in the controller cache but
has not yet been written to disk.
• wt — Write-Through caching sets
the controller to send a write-
request completion signal only after
the data is written to the disk.
NOTE: The wb and wt 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
• PERC 7, PERC 8, and PERC 9
• wc — Write-Caching sets the
controller to send a write-request
completion signal only after the data
is written to the disk.
• nwc — No-Write-Caching specifies
that the controller does not send a
write-request completion signal after
the data is written to the disk.
• fwb — Force write-back caching,
enables the write cache regardless of
whether the controller has a battery.
If the controller does not have a
battery and force write-back caching
is used, data loss may occur in the
event of a power failure
NOTE: The -wpoption is optional
and can be added to the command
line in any order after the
mandatory option combination.
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.
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