Quantum Instruments DLT 7000 manual Maxburstsize, Nodeferrcvderr, Nodisconfxdblk, Nordyuaonunld

SCSI Commands

MODE SELECT (6) / (10) Command (15h) / (55h) (continued)

Table 5–47	EEPROM Vendor Unique Page Parameters (continued)
Name	Value	Default	Length	Usage
	Rep.		(Bytes)
MAXBURSTSIZE	ASCII	0080h	2	The value in this field specifies the
	Binary			maximum amount of data to be
				transferred without disconnecting. A
				value of 0 sets no limit. This value is given
				in 512 byte increments. For example, a
				value of 8 indicates 4K bytes. Values that
				are not multiples of 8 are rounded up to
				the nearest multiple of 8. Minimum value
				of this field is 0000h, maximum is FFFFh.
NODEFERRCVDERR	ASCII	0	1	The drive reports deferred recovered error
	Binary			as current recovered error (if set).
NODISCONFXDBLK	ASCII	1	1	To turn on/off feature that prevents
	Binary			disconnecting on every fixed block data
				transfer
NORDYUAONUNLD	ASCII	0	1	When set, Not Ready to Ready unit
	Binary			attention will be removed from the unit
				attention queue upon a successful
				unload.
PERFMODE	ASCII	1	1	When set, the drive is tuned for
	Binary			performance.

When cleared, the drive is tuned for capacity.

The default for 4 MB cache tape drives is 1 (performance mode). In performance mode, compression is turned off to keep the drive streaming, thus improving performance. If PERFMODE is 0 on 4 MB cache tape drives, then compression is turned on, resulting in better capacity. PERFMODE is ignored by 8 MB cache tape drives.

Quantum DLT 7000 Tape System 5-95