AMCC 9550SX, 9500S, 9590SE, 9650SE manual Supported Model-Unit Types for ignoreECC

Chapter 2. CLI Syntax Reference

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=onoff” 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=onoff” 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=onoff” 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
9000a	No	Yes	Yes	N/A	Yes	Yes	No	No	No
9650SE	No	Yes	Yes	Yes	Yes	Yes	No	No	No

a. Models 9500S, 9550SX, and 9590SE

42 3ware Serial ATA RAID Controller CLI Guide