Unit attention and SAM

Gene Milligan Gene_Milligan at notes.seagate.com
Thu Jul 14 09:57:59 PDT 1994

Thomas Wicklund wrote:
>Is there some sort of limitation on the number of initiators a device
>can talk to between power cycles or other method to limit this?  Or
>are SCSI-3 devices required to keep per-initiator unit attention
>status for all possible devices?
 The issue you raised, is of course not limited to a Unit attention.
Configurations on a per initiator basis would imply an even more heroic memory.
However there is a very practical answer.
 Ultimately the number of initiators supported is not determined by the
theoretical maximum but by the combination of the number the implementer
chooses to support and by the actual transport chosen for the design. In the
case of the most unlimited transport, Fibre Channel, the login process limits
the number to that the implementer chose.
Gene Milligan
Gene Milligan -- Gene_Milligan at notes.seagate.com
Seagate Technology   -   920 Disc Drive   -   Scotts Valley, CA 95066 USA
Main Phone 408-438-6550   -   Email Problems postmaster at notes.seagate.com
Technical Support: BBS 408-438-8771  Fax 408-438-8137  Voice 408-438-8222  

### OGATE Version 8 message trace and attachment information:
### MsgFileName: m:\mgate\outbound\429.MSG
### Org Date:    07-14-94 09:44:37 AM
### From:        Gene Milligan at SEAGATE
### To:          scsi @ wichitaks.ncr.com @ internet
### Subject:     Re: Unit attention and SAM
### Attachments: none

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