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Using the Emulex lun-scan script

149

Additional Notes

Using the Emulex lun-scan script

Contained on the EMC approved web page of the Emulex website is

a script called

lun_scan.sh, which allow you to dynamically

(without a reboot or driver unload/reload) discover new targets and

LUNs (on new or existing targets) that have come online. This script

is located at the following URL:

http://www.emulex.com/ts/downloads/linuxfc/linux_tools.html

This script may be integrated into the system run-level transitions to

ensure that all devices are fully detected.

Note: It is highly recommended that a rescan of the SCSI bus should not be

conducted while you are running IO. The dynamic discovery and insertion of

LUNs while IO is running on applications may cause unforeseen errors to

occur on the IO in flight. The benefit of the dynamic scanning of the SCSI bus

is to reduce the need to reboot the server.

The lun_scan.sh script may be used to scan all of the Emulex

adapters or a specific Emulex adapter. If the

lun_scan.sh script is

run without specifying parameters, the output is as follows:

[root@l82bi250 /]# lun_scan.sh

Usage: lun_scan [ <#> [<#>] | all ]

where

# is a SCSI host number of a specific lpfc HBA that is to be scanned.

More than 1 host number can be specified.

all indicates that all lpfc HBAs are to be scanned.

Example:

lun_scan all : Scans all lpfc HBAs

lun_scan 2 : Scans the lpfc HBA with scsi host number 2

lun_scan 2 4 : Scans the lpfc HBAs with scsi host number 2 and 4

Warning: Scanning an adapter while performing a tape backup should

be avoided.

Examples of the usage of the script are:

◆ To obtain the SCSI host number of the Emulex adapters within

the system, refer to the /proc filesystem:

[root@l82bi250 /]# ls /proc/scsi/lpfc/

2 3

In this particular system, the Emulex adapters are listed as SCSI

host numbers 2 and 3.

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 181 182

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Emulex LightPulse LPe1105-M4 HBA Guía de instalación Pagina 149