ZBC: Action Item from webex

Joe Breher Joe.Breher at hgst.com
Wed Jun 3 09:20:02 PDT 2015


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On the ZBC webex held Monday, 2015 Jun 01, one item of discussion was a
comment from Seagate tightening requirements (change 'may' to 'shall')
related to two state machine transitions. The device manufacturers took an
action item to investigate whether they might be able to support the
tightened requirements.
These comments are reproduced below (the green portion):
 4.3.3.2.3.5 Transition ZC2:Implicit_Open to ZC5:Full
For a sequential write required zone, this transition shall occur after
successful completion of a:
a) successful completion of a finish zone operation in this zone; or
b) a write operation that writes from the write pointer to the highest LBA in
the zone that completes
successfully.
For a sequential write preferred zone, this transition:
a) may occur after successful completion of a non-sequential write operation
(see 4.3.3.3);
b) may <<'shall' requested by Seagate>> occur after successful completion of
a write operation that writes
from the write pointer to the highest LBA in this zone; and
c) shall occur after a successful completion of a finish zone operation in
this zone.
 4.3.3.2.4.4 Transition ZC3:Explicit_Open to ZC5:Full
For a sequential write required zone, this transition shall occur after
successful completion of:
a) a finish zone operation in this zone; or
b) a write operation that writes from the write pointer to the highest LBA in
the zone.
For a sequential write preferred zone, this transition:
a) may occur after successful completion of a non-sequential write operation
(see 4.3.3.3);
b) may <<'shall' requested by Seagate>> occur after successful completion of
a write operation that writes
from the write pointer to the highest LBA in this zone; and
c) shall occur after a successful completion of a finish zone operation in
this zone.
I am pleased to report that HGST can support these tightened requirements.
There was one other comment requesting a requirement change -- writes to full
zones returning other than INVAID FIELD IN CDB -- upon which we are still
checking.
Joe Breher
Storage Architecture Technologist
Standards Setting Organization
San Jose Research Center
HGST, a Western Digital company
(478) 2-Breher
(478) 227-3437
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