Next FCL Error SSWG - 6/24/97
jmcgrath at QNTM.COM
Mon Jun 16 19:43:41 PDT 1997
* From the SCSI Reflector (scsi at symbios.com), posted by:
* jmcgrath at qntm.com (Jim Mcgrath)
Although the next scheduled FC Error SSWG was announced earlier
for Tuesday, June 17, this has been postponed to Tuesday, June
24. Time is 9 am to 11 am PST. This was done o allow people
to gather thoughts and information on the sequence level
error recovery discussion we had last week at the working
While we will have a new proposal revision for the meeting, the
focus in on getting input from host, host adaptor, and drive
vendors on likes and dislikes of the current proposals.
Although labeled class 2 vs class 3, the real issues are
The overhead of setting up for timeout detection on every
IO (simple but expensive for an adaptor) or only every
IO needing error recovery (e.g. tape) (complex, since the
adaptor does not know this today, so needs an interface to
the UP software, but less expensive to implement). Note
that the problem of a disk and tape drive behind one address
makes this a common problem for both proposals.
The extendability of this to other device types (like disk).
Here we need input on the system requirements to see if any
approach thought of so far is even feasible.
The extendability of this to other protocols - this would
make us use FC only mechanisms, not FCP mechanisms.
Problems implementing protocols on today's silicon and
software, and the time and work required to overcome
Other issues I am sure. Let us raise our heads out of
the details of the proposals are set some goals and
constraints - that way we can move forward more quickly.
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