HP FC1143 Betriebsanweisung PDF herunterladen (Seite 6)

Driver parameters

Table 2 lists the MultiPulse driver parameters.

Table 2 Multi

Pulse driver parameters

Parameter

Description

lpfc_nodev_tmo

Time,inseconds,thatthedriverholdsI/Oforadevice

that is no longer accessible.

The default value is 30 seconds for single-path

conﬁgurations.

The MultiPulse installation changes this value to 10 seconds

so that path failure notiﬁcation occurs more quickly.

lpfc_lun_

queue_depth

QueuedepthperLUN.Thedefaultvalueis16.

The installation does not change the default value.

lpfc_discovery_threads

Number of kernel threads that are created during device

discovery. The default value is 32. This value ensures that

the discovery process occurs serially (one by one) in the

order in which the name server in the fabric returns world

wide names (WWNs).

The installation does not change the default value.

Important information

Tape discovery issues

The installation procedures for the Emulex Fibre Channel driver kits and the associated Linux

fibreutils utility have changed for Enterprise Backup Solution (EBS) conﬁgurations. Th e MultiPulse

driver (and fibreutils) release contains a ﬁx for intermittent device discovery issues with SCSI-2

automa

ted tape libraries.

To implement the ﬁx:

1. Install the HBA driver a nd fibreutils package using one of the following procedures:

•Runthe

INSTALL script included in the driver k it.

• Install the driver, optional multipath software, and fibreutils RPMs.

2. Enter the following commands to run the pbl script in the fibreutils directory:

#cd/o

pt/hp/hp_fibreutils/pbl

# ./pbl_inst.sh -i

3. Reboot the server to complete the installation.

Note t

he following:

• Running the pbl script installs the probe-luns utility, which runs probe-luns as par t of

the boot cycle.

• Runni

ng the ﬁx procedure (steps 1 through 3) eliminates the need to run hp_rescan –a in the

/etc

/rc.local directory for tape device discovery. If you previously added hp_rescan -a

to rc

.local (or another star tup script), remove it from the rc.local.

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