Command Tag

Ralph Weber roweber at
Tue Apr 11 09:51:58 PDT 2006

* From the T10 Reflector (t10 at, posted by:
* Ralph Weber <roweber at>
The decision regarding allocation of Task Tags is outside the
scope of the SCSI standards.
Practically speaking, where Tasks Tags are allocated depends
on the implementation.
I have written device drivers that allocated their own Task Tags
(admittedly for 1993 vintage hardware).
I am aware of HBAs that allocate the Tasks Tags themselves, which
removes the duty from the province of any device driver.
Please consult the applicable Product Specification(s) to determine
how Task Tags are handled.
All the best,
Mignon Fernandez wrote:
> Hello,
> Is it correct to assume that it is not the Driver-level software which 
> assigns the Command Tag, but the Transport-layer-level controller?
> Thanks in advance,
> Mignon Fernandez
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