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1. Hardware

Chapter 9

Setting Up the Server to Recognize the Logical

Units

At boot up, Linux automatically recognizes all SCSI disks and assigns them successive device names starting

from "sda". When assigning the device names, any internal SCSI disks are assigned first, followed by the as-

signment of the ETERNUS DX Disk storage systems' LUNs. Example: If there is one internal SCSI disk, it is as-

signed a SCSI device name as follows:

SCSI device name

/dev/sda

/dev/sdb or later

9.1

Displaying the Recognized Logical Units

The driver version and information of each LUN's SCSI device name, etc. are displayed in the console message

when Linux is booted up. Although this console message disappears soon from the screen, it can be re-dis-

played using the following commands.

9.1.1

For Red Hat Enterprise Linux

"dmesg" command for LUN display

•

Use the "dmesg" command in order to confirm whether Linux has recognized the LUNs in the ETERNUS DX

Disk storage systems.

The following shows an example:

#dmesg|less

Emulex LightPulse FC SCSI/IP 4.21q

PCI:Found IRQ 10 for device 03:06.0

!lpfc0:031:Link Up Event received Data:1 1 1 2

PCI:Found IRQ 5 for device 04:02.0

IRQ routing conflict for 04:02.0,have irq 10,want irq 5

!lpfc0:031:Link Up Event received Data:1 1 1 2

scsi3:Emulex LPFC SCSI on PCI bus 03 device 30 irq 10

scsi4:Emulex LPFC SCSI on PCI bus 04 device 10 irq 10

Vender:

Type:

Vender:

Type:

ETERNUS DX Disk storage systems User's Guide -Server Connection-(Fibre Channel) for Linux

by-id name (Example)

/dev/disk/by-id/scsi-36003005700ac3fc013746ef6315e42c4

/dev/disk/by-id/scsi-3600000e00d0000000000042200000000

/dev/disk/by-id/scsi-3600000e00d0000000000042200010000:

FUJITSU

Model: ETERNUS_DX400

Direct-Access

FUJITSU

Model: ETERNUS_DX400

Direct-Access

Rev: 0000

ANSI SCSI revision: 03

Rev: 0000

ANSI SCSI revision: 03

Explanation

Internal SCSI disk

ETERNUS DX Disk stor-

age systems' LUN

P3AM-3842-12ENZ0