Hi all,

I finally managed to track down the outstanding Del CERC issue.
Problem is the megaraid_mbox does not find any devices with
firmware levels >= 6.62. And telling users to downgrade their
BIOS is not always an option. So here's the problem:

Megaraid F/W implements a feature called 'random deletion'.
Appearently it's used for delete logical volumes on the fly
(don't ask me for details, I've no idea).
So, for handling this they shift the target IDs for the
logical channels by 0x80.
Only the legacy megaraid driver shifts the ID only for
I/O commands, whereas the megaraid_mbox driver shifts
the ID for _all_ commands.
This results in the INQUIRY command being sent to the
wrong channel, where it doesn't detect any devices.
Not surprisingly, really.

So as I don't have a clue which behavior is the correct
one we should take the safe route and just disable this
feature if an offending firmware is found.

Maybe Sumant can shed some light here. But at least we
now know the reason behind this incompability.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)