Creation and Change Attribute for RAID-5 Arrays Only
Youcan specify the following attribute with the -a option when you are using the
ssaraid command with the -C option to create a RAID-5 array:
fw_max_length (default=128 x (n-1), where n is the number of member disk drives in
the array)
This attribute sets the maximum size, in blocks, of write operations to the
cache. Write operations that are larger than the specified value write data
directly to the array,and do not use the fast-write cache.
Note: Youcan set the maximum length to be less than, but not greater than,
the default length.Any length that is greater than the default length is
ignored, and the default is used.
strip_size (default=64)
This attribute is used only when the array is created. The strip size is the
maximum amount of contiguous data that is mapped to one member disk
drive. Validvalues are: 64 (32 KB or 64 x 512 byte blocks) and 128 (64 KB or
128 x 512 byte blocks).
Creation and Change Attribute for RAID-10 Arrays Only
Youcan specify the following attribute with the -a option when you are using the
ssaraid command with the -C option to create a RAID-10 array:
strip_size (default=32)
This attribute is used only when the array is created. The strip size is the
maximum amount of contiguous data that is mapped to one member disk
drive. Validvalues are: 32 (16 KB or 32 x 512 byte blocks), 64 (32 KB or 64 x
512 byte blocks), and 128 (64 KB or 128 x 512 byte blocks).
RAID Arrays Change Attributes
This section describes the creation and change attributes that you can use for:
vAll RAID arrays
vHot spare disk drives only
vArray member disk drives only
Change Attributes for All RAID Arrays
Youcan specify the following attributes with the -a option only when you are using the
ssaraid command with the -H option to change a RAID array:
use=system/free
With the attribute set to system:
The array is made usable by the operating system. If you specify also the -d
option, a corresponding hdisk device is created for the array.
With the attribute set to free:
The array has no use assigned to it, and the operating system cannot use it as
an hdisk. If you specify the -u option, you ensure that no corresponding device
exists for the array.
248 User’s Guide and Maintenance Information
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