Emulex 3.4 user manual LPFC.conf Parameters

Table 3: LPFC.conf Parameters (Continued)

Property Name	Scope	Default	Min	Max	Dynamic	Comments
nodev-holdio	Controller	0	0=Off	1=On	Yes	This variable controls if I/O
	Specific					errors are held by the driver if
						a FCP device on the SAN
						disappears. If set, I/O errors
						will be held until the device
						returns back to the SAN
						(potentially indefinitely). This
						driver property is ignored, if
						SCSI commands are issued in
						polled mode. The upper layer
						may retry the command once
						the error is returned.
nodev-tmo	Controller	30	0	255	Yes	This variable controls how
	Specific					long I/O will be held by the
						driver if a device on the SAN
						disappears. If set, I/O will be
						held for the specified number
						of seconds. If the device does
						not appear on the SAN before
						nodev-tmo seconds, then the
						driver will fail all held I/O and
						mark the device as
						unavailable. The upper layer
						may retry the command once
						the error is returned.
num-bufs	Controller	128	64	4096	No	This variable specifies the
	Specific					number of command buffers
						to allocate. These buffers are
						used for FC Extended Link
						Services (ELS), and one for
						each FCP command issued in
						SLI-2 mode. If you want to
						queue lots of FCP commands
						to the HBA, then increase
						num-bufs for better
						performance. These buffers
						consume physical memory
						and are also used by the
						device driver to process loop
						initialization and re-discovery
						activities. Important: The
						driver must always be
						configured with at least
						several dozen ELS command
						buffers; Emulex recommends
						at least 128.

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