comments on X3T10/94-031 SCSI-3 Logical Unit Addressing
Doug, dtn 237-2145 Flames to NL: 02-Mar-1994 1431
hagerman at starch.enet.dec.com
Wed Mar 2 11:48:38 PST 1994
Here are a couple of things I noticed while reading 94-031r1 recently.
Mostly editorial, and I think some of these were noticed at the
RAID meeting last month.
> An Active bit of zero indicates the translation table shall
> not be used. An Active bit one indicate that the translation
> table shall be used to determine to which bus/target/LUN to
> send the command.
How about: "An Active bit of one indicates that..."
> A VolSel bit of zero specifies that a SDA peripheral device
> type shall use the LUN as either a reference into the LUN
> mapping mode page (if the active bit within the LUN mapping
> mode page is set to one) or as the address of a P-LUI within a
The text switches back and forth between "LUN mapping mode page"
and "translation table". In this case I think it should be:
"...reference into the LUN translation table (if the active bit within
the LUN mapping mode page is set to one)..."
> A VolSel bit of one specifies that a SDA peripheral device
> type shall use the LUN as the address of a V-LUI controlled by
> the SDA.
Add: "The value of the Active bit in the LUN translation table
> Layer 4 M:P:T or M:L or u
> M is the Address Method (2 bit field)
> P is the Bus Number (6 bit field)
> T is the Target (8 bit field)
> L is the Logical Unit Number (14 bit field)
> u is means unused and set to zero (16 bit field)
Change "P" to "B". It's used that way later anyway... Or at least
make it the same throughout. Also I think that the last line should be:
"u is unused and must be set to zero (16 bit field)"
> Example 5:
> Addressing an SDA at the second layer of the hierarchy. Note
> that the second layer SDA is also a physical target on the
> first layer path. In this example the SDA is on the fourth
> path and third target address.
> Layer 1 1:4:2
> Layer 2 0:0:0
> Layer 3 u
> Layer 4 u
I believe that layer 1 should be 0:4:2.
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