Suse Linux; Non-Boot From San; Boot From San - Dell SC4020 Deployment Manual

SuSE Linux

Timeout values determine the time a server waits before destroying a connection after losing
connectivity. With a single-path configuration that value should be set to 60 seconds to allow the WWN
of the failed port to transfer to a port on the other storage system. With a multipath configuration the
timeout value should be set to 5 seconds because the ports will fail over immediately. Configure the
timeout values as shown below based on the manufacturer of the HBA card and the path configuration.

Non-Boot from SAN

Add one of the following lines to the end of the /etc/modprobe.conf file. The setting depends on the
manufacturer of HBA card and path configuration.
Qlogic HBA Settings
Path Timeout Setting
Configuration
Single Path options qla2xxx qlport_down_retry=60
Multipath options qla2xxx qlport_down_retry=5
Emulex HBA Settings
Path Timeout Setting
Configuration
Single Path options lpfc lpfc_devloss_tmo=60
Multipath options lpfc lpfc_devloss_tmo=5

Boot from SAN

Add one of the following lines to kernel line in the /boot/grub/menu.lst file.
NOTE: With boot from SAN systems, rebuild the RAM disk and reboot the server after configuring
settings.
Qlogic HBA Settings
Path Timeout Setting
Configuration
Single Path options qla2xxx qlport_down_retry=60
Multipath options qla2xxx qlport_down_retry=5
Emulex HBA Settings
Path Timeout Setting
Configuration
Single Path options lpfc lpfc_devloss_tmo=60
Multipath options lpfc lpfc_devloss_tmo=5
HBA Server Settings
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