Chapter 9 Setting Up The Server To Recognize The Logical Units; Displaying The Recognized Logical Units; For Red Hat Enterprise Linux - Fujitsu ETERNUS DX Disk User Manual

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
Copyright 2013 FUJITSU LIMITED
Rev: 0000
ANSI SCSI revision: 03
Rev: 0000
ANSI SCSI revision: 03
26
Explanation
Internal SCSI disk
ETERNUS DX Disk stor-
age systems' LUN
P3AM-3842-12ENZ0