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C141-E124-01EN2 - 8
b) Data which have been hit by the READ or READ EXTENDED command and transferred to
the INIT once are also objects of caching as long as they are not invalidated.
c) Data transferred from the INIT and written to the disk media by the WRTTE and WRITE
EXTENDED command are objects of caching.
d) Data transferred from the INIT and written to the disk media by the WRITE AND VERIFY
command is not the objects of caching.
(3) Disabling caching data
Various data which are objects of caching in the data buffer are disabled in the following cases.
a) If any of the following commands is issued for the same data block as data which are the object
of caching, that data block ceases to be an object of caching.
x
WRITE
x
WRITE AND VERIFY
x
WRITE EXTENDED
b) If any of the following commands is issued, all the data which are objects of caching are
disabled.
x
CHANGE DEFINITION
x
FORMAT UNIT
x
LOG SELECT
x
LOG SENSE
x
MODE SELECT
x
MODE SELECT EXTENDED
x
MODE SENSE
x
MODE SENSE EXTENDED
x
PERSISTENT RSV IN
x
PERSISTENT RSV OUT
x
READ BUFFER
x
READ CAPACITY
x
READ DEFECT DATA
x
READ DEFECT DATA (12)
x
READ LONG
x
REASSIGN BLOCKS
x
RECEIVE DIAGNOSTIC RESULTS
x
RELEASE EXTENDED
x
REPORT DEV ID
x
RESERVE EXTENDED
x
SEND DIAGNOSTIC
x
SET DEV ID
x
START/STOP UNIT
x
WRITE BUFFER
x
WRITE LONG
x
WRITE SAME
c) If the data buffer where data which are objects of caching are stored is used by any of the
following commands, the data existing in that data buffer which are objects of caching are
disabled.
x
READ
x
WRITE EXTENDED
x
READ EXTENDED
x
WRITE AND VERIFY
x
WRITE
x
VERIFY
d) If any of the following events occurs, all the data which are objects of caching are disabled.
x
A RESET condition occurs on the SCSI bus.
x
A TARGET RESET message is issued by any INIT.