C141-E039-01EN
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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 WRITE, WRITE
EXTENDED, WRITE AND VERIFY or other data writing command are not 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.
•
WRITE
•
WRITE AND VERIFY
•
WRITE EXTENDED
b) If any of the following commands is issued, all the data which are objects of caching are
disabled.
•
FORMAT UNIT
•
RECEIVE DIAGNOSTIC RESULTS
•
MODE SELECT
•
SEND DIAGNOSTIC
•
MODE SELECT EXTENDED
•
START/STOP UNIT
•
READ DEFECT DATA
•
WRITE BUFFER
•
READ LONG
•
WRITE LONG
•
REASSIGN BLOCKS
•
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.
•
READ
•
WRITE
•
READ EXTENDED
•
WRITE EXTENDED
•
PRE-FETCH
•
WRITE AND VERIFY
•
VERIFY
d) If any of the following events occurs, all the data which are objects of caching are
disabled.
•
If a RESET condition occurs on the SCSI bus.
•
If a BUS DEVICE RESET message is issued by any INIT.
•
If automatic alternate processing is executed.
