Scsi features, Design approach, Power-on – HP C737990900 User Manual
Page 15: Reset strategy, Design approach 15 power-on 15 reset strategy 15
Interface Implementation 15
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For implementation details on these commands, see
and
SCSI Features
Design Approach
The features supported by the drive are based on standards, both official and
de facto. The drive is fully compliant with the SCSI-3 specification and supports
all features required by that standard. However, since most tape drive support
software has been written using the SCSI-2 standard, this document is based
on SCSI- 2 and uses SCSI-2 terminology. Since SCSI-2 is virtually a compliant
subset of SCSI-3, this is not inconsistent. However, where SCSI-3 makes an
option in SCSI-2 a requirement, the SCSI-3 requirement is always used. Also,
all required SCSI-3 extensions are supported by the drive.
Power-On
The drive will respond to
TEST UNIT READY
,
INQUIRY,
REPORT LUNS
and
REQUEST SENSE
commands within 5 seconds of power on. The first command
other than Inquiry or Request Sense from any initiator will get a
CHECK
CONDITION
status with
UNIT ATTENTION
sense data for the power on. After
this, any medium access command will be reported with a sense key of
NOT
READY
and additional sense of 3E00h (LUN has not self-configured yet).
Medium access commands will be reported with additional sense of 0401h
(drive in process of becoming ready).
Reset Strategy
Soft Resets
On receiving a reset through the Host Interface (SCSI or FC), the Host Interface
is returned to a known base state. If the reset command is received over the
Automation Controller Interface serial port, the SCSI and ACI interfaces are
returned to known base states. The baud rate for the port will be returned to its
3Ch
READ BUFFER
3Bh
WRITE BUFFER
34h
READ POSITION
10h
WRITE FILEMARKS
1Ch
RECEIVE DIAGNOSTIC RESULTS