IBM Advanced SerialRAID Adapters SA33-3285-02 User Manual page 270

Other Change Attributes for Physical Disk Drives
You can specify the following attributes with the
ssaraid command with the
use=system/spare/free
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fastwrite=on/off (default=off)
When using the fast-write cache, you can use the following attributes to control the
operation of the cache:
fw_start_block (default=0)
fw_end_block (default=array size)
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option to change a physical disk drive.
With the attribute set to system:
The physical disk drive can be used directly by the operating system. If you
specify also the option, a corresponding hdisk device is created for the
physical disk drive.
With the attribute set to spare:
The physical disk drive becomes a hot spare disk drive. It is, therefore,
available for addition to any arrays on the RAID manager that are in the
Exposed state. Specify also the
hdisk device exists for the physical disk drive.
With the attribute set to free:
The physical disk drive has no use assigned to it. It is, therefore, available for
any new arrays that are to be created. Specify also the
If you use the ssaraid command with the
about a physical disk drive, the following values for the use attribute can also
be displayed:
member
The disk drive is a member of an array.
rejected
The disk drive was a member of an array. It was rejected from the
array because it reported a problem.
You cannot change the use of member disk drives. You must first remove the
disk drives from their array, either by deleting the array, or by exchanging them
out of the array with the
You can assign new uses to disk drives that have been rejected. You must,
however, first check the disk drives to find the cause of the problem.
This attribute enables and disables the fast-write cache.
See the definition for fw_end_block .
This attribute and the fw_start_block attribute control the range of blocks for
which the fast-write cache is enabled. Write operations that are outside the
default range of 0 through array size write data directly to the disk, and do not
use the fast-write cache.
option when you are using the
option to ensure that no corresponding
option to display information
and exchange options of the ssaraid command.
option.