Emulex 3.4 user manual LPFC.conf Parameters

Table 3: LPFC.conf Parameters (Continued)

Property Name	Scope	Default	Min	Max	Dynamic	Comments
num-iocbs	Controller	256	128	10240	No	This variable indicates the
	Specific					number of Input/Output
						Control Block (IOCB) buffers
						to allocate. IOCBs are internal
						data structures used to send
						and receive I/O requests to
						and from the LightPulse hard-
						ware. Too few IOCBs can
						temporarily prevent the driver
						from communicating with the
						HBA, thus lowering per-
						formance. (This condition is
						not fatal.) If you run heavy IP
						traffic, increase num-iocbs for
						better performance.
post-ip-buf	Controller	128	64	1024	No	This variable specifies the
	Specific					number of 4K STREAMS
						buffers to allocate and post to
						the FC IP ring. Increase this
						setting for better IP
						performance under heavy
						loading.
scan-down	Controller	1	0=Off	1=On	Yes	There are two scanning
	Specific					algorithms used to discover a
						node in a private loop. If scan-
						down is 1, devices on the
						private loop are scanned
						starting from ALPA 0x01
						through ALPA 0xEF. If scan-
						down is 0, devices on the
						private loop are scanned
						starting from ALPA 0xEF
						through ALPA 0x01. Scan-
						down values 0 and 1 do not
						apply if a loop map is
						obtained. See the FC-AL
						profile for the definition of a
						loop map.
tgt-queue-depth	Global	0	0	10240	No	The driver uses this value as
						the default limit for the number
						of simultaneous commands to
						issue to a single target on the
						loop. A value of 0 causes no
						target throttling to occur. A
						single target will never be sent
						more commands than allowed
						by tgt-queue-depth; however,
						less may be sent when sd-
						max-throttle is reached for the
						entire target.

The HBAnyware Utility User Manual Page 72