HP 3PAR SUSE Linux Enterprise Implementation Guide

4. After the server is rebooted, you can check that devices are multipathed by issuing a

multipath -ll command.

# multipath -ll

350002AC00003011Bdm-0 3PARdata,VV

[size=20G][features=1 queue_if_no_path][hwhandler=0]

\_ round-robin 0 [prio=0][active]

\_ 0:0:0:0 sda 8:0 [active][ready]

\_ 1:0:0:0 sdb 8:16 [active][ready]

5. Verify that the Emulex HBA driver parameter has taken its correct value:

# cat /sys/class/scsi_host/hostX/lpfc_devloss_tmo

6. Optionally, you can add SCSI layer parameters to /etc/modprobe.conf.local to increase

or modify maximum number of LUNs the OS can discover. For example, for the OS to support

256 LUNs per target port:

options scsi_mod max_luns=256

So /etc/modprobe.conf.local could look like this when the SLES server is connecting

to an HP 3PAR array running HP 3PAR OS 3.1.1 or later.

NOTE: If the HP 3PAR array is running an HP 3PAR OS version earlier than 3.1.1, then the

lpfc_devloss_tmo setting should be 1 rather than 14.

# cat /etc/modprobe.conf.local

# please add local extensions to this file

options lpfc oss_tmo=14 lpfc_lun_queue_depth=16 lpfc_discovery_threads=32

options scsi_mod max_luns=256

7. After adding the parameters to the file /etc/modprobe.conf.local, rebuild the ramdisk

by issuing the following command:

# /sbin/mkinitrd -f mapth

8. Reboot the server.

Changing the QLogic HBA Driver Parameters

To change the QLogic HBA inbox driver parameters for SUSE. complete the following steps:

1. Change the default value of the QLogic HBA driver parameter qlport_down_retry by

adding the following line in the file /etc/modprobe.conf.local and rebuilding the ramdisk:

# vi /etc/modprobe.conf.local file.

options qla2xxx qlport_down_retry=10 ql2xmaxqdepth=16 ql2xloginretrycount=30

NOTE: The example above is for an SLES server running HP 3PAR OS 3.1.1 or later.

However, if the HP 3PAR StoreServ Storage array is running an HP 3PAR OS version earlier

than 3.1.1, then the qlport_down_retry setting should be set to 1.

Changing the QLogic HBA Driver Parameters 69