User Manual

SCSI Commands Reference Manual, Rev. J 420
www.seagate.com Parameters for direct access devices
5.3.19.2 Threshold descriptor format
The threshold descriptor format is defined in table 394.
ENABLED bit
1 an ENABLED bit set to one specifies that the threshold is enabled.
0 an ENABLED bit set to zero specifies that the threshold is disabled.
THRESHOLD TYPE field
The THRESHOLD TYPE field (see table 395) specifies the type of this threshold.
Table 394 Threshold descriptor format
Bit
Byte
7 6 5 4 3 2 1 0
0 ENABLED Reserved THRESHOLD TYPE THRESHOLD ARMING
1 THRESHOLD RESOURCE
2
Reserved
3
4 (MSB)
THRESHOLD COUNT. . .
n (LSB)
Table 395 THRESHOLD TYPE field
Code Description
000b
If the THRESHOLD COUNT field specifies a soft threshold, the threshold is enabled, and that threshold is
reached, then the device server shall establish a unit attention condition as described in SBC-4.
001b
If the THRESHOLD COUNT field specifies a percentage threshold, the threshold is enabled, and that threshold
is reached, then the device server shall establish a unit attention condition as described in SBC-4.
All others
Reserved