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Required Adapter and Server OS Settings
114 Dell EMC Storage Compatibility Matrix for SC, PS, and FS Series Arrays | DSCM
A.2.3 Linux (Red Hat, SuSE, Oracle, Ubuntu)
A.2.3.1 FC PortDown timeout
The HBA PortDown timeout parameter dictates how long a Linux system waits before destroying a connection
after being losing its connectivity with the port. The PortDown timeout is generally set to 60 seconds for the
SC Series storage system.
To configure the PortDown timeout in the HBA driver module, add or append the following options to the
appropriate HBA driver module configuration file and reload the driver module.
A. For Qlogic, add in /etc/modprobe.d/qla2xxx.conf
options qla2xxx qlport_down_retry=60
Reload the module
# modprobe –r qla2xxx
# modprobe qla2xxx
B. For Emulex, add in /etc/modprobe.d/lpfc.conf
options lpfc lpfc_devloss_tmo=60
Reload the module
# modprobe –r lpfc
# modprobe lpfc
A.2.3.2 Verifying parameters
To verify that the configuration changes have taken effect, examine the driver module parameter values in
their respective files.
A. For QLogic:
# cat /sys/module/qla2xxx/parameters/qlport_down_retry
B. For Emulex:
# cat /sys/module/lpfc/parameters/lpfc_devloss_tmo
# cat /sys/class/scsi_host/hostX/lpfc_devloss_tmo #where X is the HBA no.
A.2.3.3 FC/iSCSI volume multipath configuration
A basic template can be copied from /usr/share/doc/device-mapper-multipath-
<version>/multipath.conf to /etc/multipath.conf as a starting point. Any settings that are not
defined explicitly in the file would assume the default values. The full list of these settings can be obtained
using the following command. Specific SC Series storage system settings can be found by searching for
COMPELNT from the output.