User Manual

SCSI Commands Reference Manual, Rev. J 393
www.seagate.com Parameters for direct access devices
FSW (FORCE SEQUENTIAL WRITE) bit
1 The Force Sequential Write (FSW) bit, when set to one, indicates that multiple block writes are to be transferred over the SCSI bus and
written to the media in an ascending, sequential, logical block order.
0 When the FSW bit equals zero, the target is allowed to reorder the sequence of writing addressed logical blocks in order to achieve a
faster command completion.
LBCSS bit
1 A logical block cache segment size (LBCSS) bit set to one specifies that the CACHE SEGMENT SIZE field units shall be interpreted as logi-
cal blocks.
0 An LBCSS bit set to zero specifies that the CACHE SEGMENT SIZE field units shall be interpreted as bytes. The LBCSS shall not impact the
units of other fields.
DRA (Disable READ-Ahead) bit
1 The Disable READ-Ahead (DRA) bit, when set to one, requests that the target not read into the buffer any logical blocks beyond the
addressed logical block(s).
0 When the DRA bit equals zero, the target may continue to read logical blocks into the buffer beyond the addressed logical block(s).
SYNC_PROG field
The synchronize cache progress indication support (SYNC_PROG) field specifies device server progress indication reporting for the
SYNCHRONIZE CACHE commands as defined in 3.52.
NV_DIS bit
1 An NV_DIS bit set to one specifies that the device server shall disable a non-volatile cache and indicates that a non-volatile cache is sup-
ported but disabled.
0 An NV_DIS bit set to zero specifies that the device server may use a non-volatile cache and indicates that a non-volatile cache may be
present and enabled.
NUMBER OF CACHE SEGMENTS byte
The NUMBER OF CACHE SEGMENTS byte gives the number of segments into which the host requests the drive divide the cache.
CACHE SEGMENT SIZE field
The CACHE SEGMENT SIZE field indicates the requested segment size in bytes. This manual assumes that the Cache Segment Size field is valid
only when the Size bit is one.