HP 3PAR SUSE Linux Enterprise Implementation Guide

3. Once the driver layer has discovered the device, run the echo statement for the SUSE OS
layer to discover the HP devices:
# echo " - <target number> <lun number>" > <device scan path>
If the device path is /sys/class/scsi_host/host2, the target is 0 (target 2:0:0), and
the exported device is LUN 1, then the echo statement would appear as the following example:
# echo "- 0 1" > /sys/class/scsi_host/host2/scan
The following message log provides and example of the resulting output:
kernel: Vendor: 3PARdata Model: VV Rev: 0000
kernel: Type: Direct-Access ANSI SCSI revision: 03
kernel: SCSI device sdv: 524288 512-byte hdwr sectors (268 MB)
kernel: SCSI device sdv: drive cache: write back
kernel: sdv: unknown partition table
kernel: Attached scsi disk sdv at scsi2, channel 0, id 0, lun 1
kernel: Attached scsi generic sg22 at scsi2, channel 0, id 0, lun 1, type 0
scsi.agent[12915]: disk at /devices/pci0000:00/0000:00:02.0/0000:01:00.2/
0000:03:0b.0/0000:04:04.0/host2/target2:0:0/2:0:0:1
• Alternatively, you can scan for all LUNs and targets for a given qla2xxx instance using
the following command:
# echo "- - -" > /sys/class/scsi_host/host2/scan
• If the device has changed its size, then issue the following command to obtain the new
disk size:
# echo 1 > /sys/class/scsi_host/host2/device/rport-2:0-0/target2:0:0/2:0:0:1 Rescan
Alternatively, you can use the rescan-scsi-bus.sh script to scan and discover LUNs.
Method 2 - Scan using add single device
This method involves performing a QLogic driver scan scsi-qlascan followed by adding LUNs
using the echo scsi add statement. To scan using add single device method, complete
the following steps.
NOTE: If you are using the QLogic driver that is installed during the OS installation, you can
skip performing the scsi -qlascan script and scan for devices using the following echo
command:
# echo " - <target number> <LUN number>" > <device scan path>
1. Issue scsi-qlascan to discover devices:
# echo "scsi-qlascan" > /proc/scsi/qla2xxx/<adapter-id>
54 Allocating Storage for Access by the SUSE Host