command. JMR Electronics, Inc. has implemented all of the SAF-TE commands
in the SAF-TE specification including the optional commands, to ensure
compatibility with other vendors. All of the SAF-TE commands can be accessed
through the utility software even if the host adapter has not implemented it or does
not support the command.
SAF-TE does not require that any additional cabling be installed between the
enclosure and the host. Since the enclosure is assigned an ID on the SCSI bus, all
of the communication between the host and enclosure takes place over the SCSI
bus. For SAF-TE to function, both the enclosure and the host adapter must
support the SAF-TE specification and be connected on the same bus in order to
communicate. The SEP in the enclosure is a passive target and will not execute
these commands unless an initiator host controller requests it.
Perform Slot Operation Command
Perform slot operation is a mandatory SAF-TE command that is used to perform
various operations on device slots. The available operations are listed below.
Prepare for operation
Requests that the enclosure SEP should take any action required to make
the device in the selected slot available on the SCSI bus. This powers up
the slot.
Prepare for insertion or removal
Requests that the enclosure SEP should take any action required to allow
the safe physical insertion or removal of a device from the selected slot.
This powers down the slot.
Identify
Requests that the enclosure SEP should indicate the physical location of
the selected slot. This causes the selected slot activity LED to blink.
Read Device Slot Status Command
Read device slot status is a mandatory SAF-TE command that returns information
on the current state of each drive/slot. The available status reports are described
below:
Device Inserted
Reports whether or not there is a physical device inserted in the slot
selected.
Ready for Insertion/ Removal
Reports whether or not the slot is ready for the physical insertion or
removal of a device.
Prepared for Operation
Reports whether or not the slot is activated so that the inserted drive may
be accessed on the SCSI bus.
FORTRAH1 Chaparral G5312 InstallationGuide Rev C 9-14