[rescue] ***SPAM*** Re: StorEdge Multipack 711 questions

[Andy Wallis]

> On Feb 6, 2023, at 9:21 AM, Dave McGuire <mcguire at neurotica.com> wrote:
> 
> On 2/6/23 06:30, Mike Spooner via rescue wrote:
>> Care needed with the 12-slot model. The 12-slot internal SCSI backplane is only qualified for Fast-SCSI signalling speed. If you equip that with Ultra-SCSI drives and connect it to an Ultra-SCSI-capable host adaptor (eg: the builtin SCSI in the Ultra-2 workstation and Enterprise 250 and others, orB  https://fido.aalin.co.uk/vault/hw/system/sun/sbus-se-uws/), the OS will negotiate with the drives for transmission speed and select Ultra-SCSI, not being able to notice that that particular 711 *backplane* is not rated for that speed; the result being likely data-corruption. Sun issued a product notice about that issue, after some customers experienced exactly that data-corruption problem. The "fix" is to either disable Ultra-SCSI capability on the host adaptor concerned (on Solaris via a setting in /etc/hosts), or by not using Ultra-SCSI-capable drives in the enclosure.
> 
>  I really don't think that's in /etc/hosts.
> 
>            -Dave
The change would be in /etc/system by setting the scsi_option. Sun didn’t seem to document the bit field format of the scsi_options all that well. Did anyone ever fully document the bit fields and their meaning?
Sun normally expected you to not set it and let auto configuration handle it. 
-Andy Wallis