IBM DBCA-203240, Технические характеристики

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12.30.1.5 SMART Execute Off-line Immediate (Subcommand D4h)
This subcommand causes the device to immediately initiate the set of off-line data collection activities that
collect attribute data in an off-line mode.
Upon receipt of the subcommand from the host, the device sets BSY to one, begins its set of off-line data
collection activities, clears BSY to zero and asserts INTRQ.
During execution of its off-line activities the device will not set BSY nor clear D R D Y .
If the device is in the process of performing its set of off-line data collection activities as a result of receiving
a S M A R T Execute Off-line Immediate subcommand from the host and is interrupted by any new command
from the host,the device will abort its off-line data collection activities and service the host within two
seconds after receipt of the new command. Off-line data collection activity must be restarted by a new
S M A R T Execute Off-line Immediate subcommand from the host.
An issuance of this subcommand just initiates only one off-line test item (called a “segment”). Once a
segment completes, the device just advances the current segment pointer to next one and set the off-line data
collection status to be 01h (“A segment completed”), then terminates off-line activity. The host shall con-
tinue to issue this subcommand until off-line data collection status is set to 02h (“All Segments Completed”)
in order to perform all set of off-line segments.
The host can obtain device's estimated time to complete the current segment, along with the off-line data
collection status, by issuing a S M A R T Read Attribute Values subcommand. Since the device may not com-
plete a segment within its estimated time, an issuance of a S M A R T Read Attribute Values subcommand
could abort ongoing off-line test. In this case, the current segment pointer remains unchanged and off-line
data collection status is set to 05h (as any other commands do for ongoing off-line test).
12.30.1.6 SMART Enable Operations (Subcommand D8h)
This subcommand enables access to all S.M.A.R.T. capabilities within the device. Prior to receipt of a
S M A R T Enable Operations subcommand, Attribute Values are neither monitored nor saved by the device.
The state of S.M.A.R.T. (either enabled or disabled) will be preserved by the device across power cycles.
Once enabled, the receipt of subsequent S M A R T Enable Operations subcommands will not affect any of the
Attribute Values.
Upon receipt of the S M A R T Enable Operations subcommand from the host, the device asserts BSY,
enables S.M.A.R.T. capabilities and functions, clears BSY and asserts INTRQ.
12.30.1.7 SMART Disable Operations (Subcommand D9h)
This subcommand disables all S.M.A.R.T.capabilities within the device including the device's attribute
autosave feature. After receipt of this subcommand the device disables all S.M.A.R.T. operations. Non self-
preserved Attribute Values will no longer be monitored. The state of S.M.A.R.T. (either enabled or disabled)
is preserved by the device across power cycles. Note that this subcommand does not preclude the device's
power mode attribute autosaving.
Upon receipt of the S M A R T Disable Operations subcommand from the host, the device asserts BSY, disa-
bles S.M.A.R.T. capabilities and functions, clears BSY and asserts INTRQ.
After receipt of the device of the S M A R T Disable Operations subcommand from the host, all other
S.M.A.R.T. subcommands -- with the exception of S M A R T Enable Operations -- are disabled, and invalid
Command Descriptions
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