[T10] Suspicious wording in SBC-4r16
gerry.houlder at seagate.com
Fri Jan 18 13:10:20 PST 2019
i suspect that SBC-4 clause 188.8.131.52 is either missing some word or has an
extra paragraph. This is the current wording in blue:
184.108.40.206 Thin provisioned logical unit
A thin provisioned logical unit shall support logical block provisioning
management (see 220.127.116.11).
The device server in a thin provisioned logical unit may indicate a larger
capacity in the RETURNED LOGICAL BLOCK ADDRESS field (see 5.19.2) and the
READ CAPACITY (16) parameter data (see 5.20.2) than the number of LBA
mapping resources available for mapping LBAs in the logical unit.
The device server shall map, anchor, or deallocate each LBA in a thin
provisioned logical unit (see table 5). A thin provisioned logical unit is
not required to provide LBA mapping resources sufficient to map all LBAs
for the logical unit’s capacity as indicated in the RETURNED LOGICAL BLOCK
ADDRESS field of the READ CAPACITY (10) parameter data (see 5.19.2) and the
READ CAPACITY (16) parameter data (see 5.20.2).
First, the second paragraph includes READ CAPACITY (16) but does not
include READ CAPACITY (10). At a bare minimum, READ CAPACITY (10) should be
included in the wording next to READ CAPACITY (16) like it is in the third
paragraph and like it is in clause 18.104.22.168.
Second, i observe that the third paragraph includes all of the information
that is in the second paragraph plus some additional information.* I
suspect that in the near past the third paragraph was drafted as a
replacement for the second paragraph* but somehow the second paragraph was
retained instead of being deleted. i would like to ask the members that
have created proposals that involved these paragraphs to review the
intended wording and help decide if the correct way to resolve this
conundrum is to delete the second paragraph. i encourage folks with an
opinion on this matter to reply to the T10 reflector before the March
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