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Fujitsu MAN3367 User Manual

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C141-E124-01EN
4 - 27
l.
Maximum pre-fetch control block count  (not supported)
This parameter specifies the maximum quantity of logical data blocks pre-fetched to the data
buffer with the READ command or READ EXTENDED command.  In the IDD the maximum
pre-fetch quantity cannot be limited.
This parameter cannot be changed.  The IDD disregards the specification in this field.
m. DRA (Disable Read-ahead)  (not support)
This bit specifies whether or not activate the read-ahead operation.
This bit cannot be changed.  The IDD disregards the specification in this bit.
"1"   : Requests that the device server not read into the buffer any logical blocks beyond the
addressed logical blocks.
"0"   : The device server continues to read logical blocks into the buffer beyond the addressed
logical blocks.
n. FSW (force sequential write)  (not supported)
This bit specifies how to write multiple blocks.
"1"   : If the IDD writes multiple blocks, this indicates that data are recorded on the disk media
in the order in which they are transferred from the INIT.
"0"   : If the IDD writes multiple blocks, this indicates that data are recorded on the disk media
with their order changed in order to complete the command in the fastest time.
This bit cannot be changed.  The IDD disregards the specification in this bit and operates
according to the "Default" value (="1").
o. LBCSS (Logical Block Cache Segment Size) (not supported)
"1"   : Indicates that the "Cache segment size" field units are interpreted as logical blocks.
"0"   : The "Cache segment size" field units are interpreted as bytes.
This bit is not supported for the IDD.  The IDD disregards the specification in this bit.
p. Cache segment count
This parameter specifies the number of cache segments used by the IDD.  This parameter is
valid when the SIZE bit specification is "0."
When a value greater than max value is specified, the IDD performs rounding processing and
sets max value.  Also, when a value less than 3 is specified, the IDD performs rounding
processing and set 4.