[T13] Integrating zone attribute ideas from T13 ZAC call

Ralph Weber Ralph.Weber at wdc.com
Thu May 21 03:39:32 PDT 2015


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1505211_f.htm">HTML-formatted message</a>

Reading the tea leaves from the zone attributes discussion was impossible in
real time. In effect, a new style element is being built from existing style
elements (e.g., UML attributes). It is hard to tell where the boundaries lie
for this construction effort.
So, taking the zone attributes issues as a starting point, here are some
ideas that push the envelope rather farther than some might be willing to
stomach.
Note that only enough information is shown to initiate this discussion (i.e.,
this is not a draft proposal in email form).
Don’t be shy about sharing concerns on one or both of these reflectors.
All the best,
.Ralph
Table x1 – Summary of zone attributes
Attribute
Description
Write Pointer (case change significant)
Encapsulation of the zone’s write pointer and whether that write pointer is
valid
Zone Condition …
Enumeration of like names zone attributes only one of which is true based on
the zone’s state
RWP Recommended
minor changes as per call’s discussion
Non-Sequential Write Resources Active
minor changes as per call’s discussion
Write Pointer zone attribute
The Write Pointer zone attribute represents the combination of the zone’s
write pointer (see write pointer zones overview) and whether that write
pointer is valid  (see table in state machine).
Zone Condition zone attributes
The Zone Condition zone attributes enumerate the possible states of the zone
in the Zone Condition state machine (see state machine) as shown in table x2
to indicate the current Zone Condition state for the zone. Only one zone
attribute in the Zone Condition enumeration is true at any point in time.
Table x2 – Zone Condition attributes
Zone Condition zone attribute
Zone state indicated for the zone if the
Zone Condition zone attribute is true
Zone Condition Empty
ZC1:Empty
Zone Condition Implicitly Opened
ZC2:Implicit_Open
Zone Condition Explicitly Opened
ZC3:Explicit_Open
Zone Condition Closed
ZC4:Closed
Zone Condition Full
ZC5:Full
Zone Condition Read Only
ZC6:Read_Only
Zone Condition Offline
ZC7:Offline
Example – A zone that is described as a zone “in Zone Condition Closed”
is a zone in the ZC4:Closed state.
Note – A glossary entry is still needed for Zone Condition Open, along the
lines of …
Zone Condition Open
zone in Zone Condition Explicitly Opened or Zone Condition Implicitly Opened
RWP Recommended
minor changes as per call’s discussion
Non-Sequential Write Resources Active
minor changes as per call’s discussion



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