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Chapter 2. CLI Syntax Reference

48 3ware Serial ATA RAID Controller User Guide

group=3|4|5|6|7|8|9|10|11|12/13|14|15|16 indicates the number of disks per

group for a RAID 50 type. (This attribute can only be used when

type=raid50.) Recall that a RAID 50 is a multi-tier array. At the bottom-most

layer, N number of disks per group are used to form the RAID 5 layer. These

RAID 5 arrays are then integrated into a RAID 0. This attribute allows you to

specify the number of disks in the RAID 5 level. Valid values are 3 through

16. However, no more than 4 RAID 5 subunits are allowed in a RAID 50 unit.

Note that a sufficient number of disks are required for a given pattern or disk

group. For example, given 6 disks, specifying 3 will create two RAID 5

arrays. With 12 disks, specifying 3 will create four RAID 5 arrays under the

RAID 0 level. With only 6 disks a grouping of 6 is not allowed, as you would

basically be creating a RAID 5.

The default RAID 50 grouping varies, based on number of disks. For 6 and 9

disks, default grouping is 3. For 8 disks, the default grouping is 4. For 10

disks, the default grouping is 5, and for 12 disks, the disks can be grouped into

groups of 3, 4, or 6 drives (the group of 4 drives is set by default as it provides

the best of net capacity and performance). For 15 disks, the disks can be

grouped into 5 drives (3 drive groups would make 5 subunits, you can have a

maximum of 4 subunits). 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 70. This feature is not supported on model 7000/8000.

9650SE

and

9690SA

16 N/A 16 16 N/A 16 N/A

64 64 64 64 64

256 256 256 256

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

Table 7: Supported Stripe Sizes (KB)

Model R0 R1 R5 R6 R10 Spare R50 Single

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 109 110

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