LSI 3008 based HBA (mpr) and backplane slot identification

[Borja Marcos]

On Jun 4, 2015, at 5:23 PM, Alan Somers wrote:

> I've never used sas3ircu or sas2ircu, but it's probably getting the
> slot number based on either the expander's SES Additional Element
> Status Page, or by the expander's SMP DISCOVER response.  Both of
> those methods will give stable responses.  Even if you swap drives,
> move them around, turn phys on and off, etc, both of those methods
> will still map the same physical slot to the same Slot # every time.
> Only an expander or HBA firmware upgrade can change it.  However, the
> slot mapping may not make intuitive sense.  You'll have to experiment
> to see what Slot # corresponds to what physical slot.

Thank you very much. At least on the machines on which I am using it, the mapping is
stable and even intuitive. 

What I was wondering was it something could change the mapping unexpectedly. 
Understood, a firmware update is a risk, but I was thinking about those static mappings
between target IDs and particular disks (I imagine, serial numbers) kept by the HBA. It
would be a tickling timebomb if, say, after four or five disk replacements numbers begun
to get shuffled.

> When you need to replace a drive, your best option would be to use the
> "sas3ircu locate" command to turn on the slot's error LED.  Then you
> won't need to consult a slot mapping diagram.

Sorry, I didn't know that command. I haven't been exactly eager to try options to sas[23]ircu
because it's intended for IR firmware (or that I understand) and I am using IT.



Thank you very much!




Borja.