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Chapter 2. CLI Syntax Reference
42 3ware Serial ATA RAID Controller CLI Guide
grouped into groups of 3 or 5 drives. For 16 disks, the disks can be grouped
into groups of 4 or 8 drives.
noscan attribute instructs CLI not to notify the operating system of the
creation of the new unit. By default CLI will inform the operating system.
One application of this feature is to prevent the operating system from
creating block special devices such as /dev/sdb and /dev/sdc as some
implementations might create naming fragmentation and a moving target.
nocache attribute instructs CLI to disable the write cache on the newly
created unit. Enabling write cache increases write performance at the cost of
potential data loss in case of sudden power loss (unless a BBU or UPS is
installed). By default the cache is enabled. To avoid the possibility of data loss
in the event of a sudden power loss, it is recommended not to set nocache
unless there is a BBU (battery backup unit) or UPS (uninterruptible power
supply) installed.
autoverify attribute enables the autoverify attribute on the unit that is to be
created. For more details on this feature, see “/cx/ux set autoverify=on|off” on
page 68. This feature is not supported on model 7000/8000. On model 9000,
the JBOD autoverify attribute is not persistent (does not survive reboots).
noqpolicy attribute instructs CLI to disable the qpolicy (drive queuing) on the
newly created unit. The default is for the qpolicy to be on (in other words,
noqpolicy is not specified). For a spare unit, specifying noqpolicy has no
effect and the default remains. If the spare unit becomes a true unit, it would
adopt the qpolicy of the “new” unit. For JBOD, the qpolicy cannot be set
during unit creation, and specifying noqpolicy returns an error. For more
about drive queuing, see “/cx/ux show qpolicy” on page 62 and “/cx/ux set
qpolicy=on|off” on page 70.
ignoreECC attribute enables the ignoreECC/OverwriteECC attribute on the
unit that is to be created. For more details on this feature, see “/cx/ux set
ignoreECC=on|off” on page 69. The following table illustrates the supported
Model-Unit Types. This table only applies to setting this feature at unit
creation time. IgnoreECC only applies to redundant units.
For the 7/8000
series, this setting is only applicable during rebuild; it is not applicable
during creation.
Table 8: Supported Model-Unit Types for ignoreECC
Model R-0 R-1 R-5 R-6 R-10 R-50 Single JBOD Spare
7K/8K No No No N/A No No No No No
9000
a
a. Models 9500S, 9550SX, and 9590SE
No Yes Yes N/A Yes Yes No No No
9650SE No Yes Yes Yes Yes Yes No No No