Unit Object Commands
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94
/c
x
/u
x
set cache=on|off [quiet]
This command is the same as “/cx/ux set wrcache=on|off [quiet]”. Please see
below for details.
/c
x
/u
x
set wrcache=on|off [quiet]
This command allows you to turn
on
or
off
the write cache for a specified unit
/cx/ux
. This feature is supported on all controllers.
By default, write cache is
on
.
Write cache includes the disk drive cache and controller cache.
When write cache is
on
, data will be stored in 3ware controller cache and
drive cache before the data is committed to disk. This allows the system to
process multiple write commands at the same time, thus improving
performance. However when data is stored in cache, it could be lost if a power
failure occurs. With a Battery Backup Unit (BBU) installed, the data stored on
the 3ware controller can be restored.
The following table shows the supported RAID types for write caching as a
function of controller model and logical unit type. N/A (Not Applicable)
refers to cases where the given logical unit type is not supported on a
particular controller model.
The
quiet
attribute turns off interactive mode, where no confirmation is
requested to proceed.
/c
x
/u
x
set rdcache=basic|intelligent|off
This command allows you to set the read cache to either
Basic
,
Intelligent
, or
Off
on a specified unit. Setting this to
Intelligent
enables both
Intelligent
Mode
features and
Basic Mode
features. Setting it to
Off
disables both.
This command is supported on the 9690SA and 9650SE controllers. This
feature is supported in all types of RAID units.
Table 12: Supported RAID Types for Write Caching
Model
R0
R1
R5
R6
R10
R50
Single
Spare
JBOD
7K/8K
Yes
Yes
Yes
N/A
Yes
N/A
N/A
No
Yes
9000
a
a. Models 9500S, 9550SX, and 9590SE
Yes
Yes
Yes
N/A
Yes
Yes
Yes
No
Yes
9650SE
and
9690SA
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Summary of Contents for 720-0192-00
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