sdparm is a Linux utility that can "access SCSI modes pages; read VPD pages; send simple SCSI commands". It has also been ported to Windows.
sdparm(8) - Linux man page:
http://linux.die.net/man/8/sdparmThe sdparm utility (including downloads):
http://sg.danny.cz/sg/sdparm.htmlI have no experience with sdparm or with the SCSI protocol in recent times, but here is what I have managed to discern from the aforementioned documentation (/dev/ice is a device name such as /dev/sda, /dev/sdb, etc).
To retrieve the contents of mode page 19h:
sdparm --page=0x19 /dev/ice
"RLM" appears to be the acronym used by sdparm to denote the "Ready LED meaning" bit.
Therefore, to get the current value of the RLM bit in hex:
sdparm --get RLM=1 -H /dev/ice
To set the RLM bit to 1 in the current values page:
sdparm --set=RLM /dev/ice
To set the RLM bit to 1 in the current and saved values page:
sdparm --set=RLM --save /dev/ice
To clear the RLM bit (0):
sdparm --clear=RLM /dev/ice
To clear the RLM bit (0) in the current and saved values page:
sdparm --clear=RLM --save /dev/ice
To re-establish the manufacturer's defaults in the current and saved values of mode page 19h:
sdparm --page=0x19 --defaults --save /dev/ice
I suggest that you first determine the current value of the RLM bit. Then use the appropriate clear or set command to flip this bit. I'm hoping that mode page 19h is writeable rather than read-only, otherwise any changes may not survive a power cycle. Furthermore, even if the changes are successful, the behaviour of the Ready LED may not change until the processor re-examines the RLM bit, which may not be until the next power cycle. Therefore you may not notice an immediate change in LED behaviour straight after executing sdparm.
