HP 3PAR RedHat and Oracle Linux Implementation Guide

ManualsBrandsHP ManualsComputer AccessoriesHP 3PAR Inform S800/4x500GB Nearline Magazine LTU

101

102

103

104

105

106

107

108

109

110

where:

• 0 specifies the host

• 1 specifies the channel

• 2 specifies the ID

• 3 specifies the LUN

(The SCSI midlayer will re-scan.)

# echo "scsi add-single-device 2 0 0 14" > /proc/scsi/scsi

You can see the new LUN presented to the OS by the SCSI Mid-Layer in the /var/log/messages

file.

kernel: Vendor: 3PARdata Model: VV Rev: 0000

kernel: Type: Direct-Access ANSI SCSI revision: 03

kernel: SCSI device sdac: 524288 512-byte hdwr sectors (268 MB)

kernel: SCSI device sdac: drive cache: write back

kernel: sdac: unknown partition table

kernel: Attached scsi disk sdac at scsi2, channel 0, id 0, lun 14

kernel: Attached scsi generic sg29 at scsi2, channel 0, id 0, lun 14, type 0

Dec 12 14:08:50 sqa-dell2850-01 scsi.agent[14234]: disk at /devices/pci0000:00/

0000:00:02.0/0000:01:00.2/0000:03:0b.0/0000:04:04.0/host2/target2:0:0/2:0:0:14

NOTE: The echo command needs to be executed on multiple host lpfc HBA SCSI instances

where LUNs have been exported.

Verifying Devices Found by the Host Using the Emulex HBA

To verify that the RHEL host has discovered the exported devices, look at the contents of the

/proc/scsi/scsi file. In this example, we have LUN 0 exported to the RHEL host through eight

paths (four HP 3PAR StoreServ Storage ports connecting to two Emulex HBA ports). This file should

contain entries for the attached devices:

HP 3PAR StoreServ Storage

# cat /proc/scsi/scsi

[root@sqa-dl380g5-05 ~]# cat /proc/scsi/scsi

Attached devices:

Host: scsi4 Channel: 00 Id: 00 Lun: 00

Vendor: 3PARdata Model: VV Rev: 3110

Type: Direct-Access ANSI SCSI revision: 05

Host: scsi5 Channel: 00 Id: 00 Lun: 00

Vendor: 3PARdata Model: VV Rev: 3110

Type: Direct-Access ANSI SCSI revision: 05

scsi4 and scsi5 refer to the HBA adapter instances (/sys/class/scsi_host/host4 and

/sys/class/scsi_host/host5), respectively. Alternatively, use Isscsi -g for RedHat

5 or 6.

Discovering Devices with a QLogic HBA

Use one of the following methods to dynamically add new LUNs:

Discovering Devices with a QLogic HBA 107