Release Notes

Connectivity considerations
10 Dell EMC PowerVault ME4 Series and Linux | 3924-BP-L
The following list includes key zoning rules and recommendations.
• Use the point-to-point protocol to connect to a fabric switch.
• Both the ME4 Series system and the Linux hosts should be connected to two different Fibre Channel
switches (fabrics) for high availability and redundancy.
• Name zoning using WWNs is recommended. See 2.2.1.1 and 2.2.1.2 for instruction on identifying the
WWNs on hosts and the ME4 Series array.
• When defining the zones, it is a best practice to use single-initiator (host port), multiple-target (ME4
ports) zones. For example, for each Fibre Channel HBA port on the server, create a server zone that
includes the HBA port WWN and all the physical WWNs on the ME4 Series system controllers on the
same fabric. See Table 1 for an example.
Fibre Channel zoning examples
Fabrics
(dual-switch
configuration)
FC HBA port
(dual-port HBA
configuration)
ME4 Series FC ports
All-FC port configuration
FC/iSCSI port configuration
Fabric one zone
Port 0
A0, B0, A2, B2
A0, B0*
Fabric two zone
Port 1
A1, B1, A3, B3
A1, B1*
*In an FC/iSCSI configuration, only ports A0, A1, B0, and B1 are available. Ports A2, A3, B2, and B3 are reserved for iSCSI.
Note: Dell EMC recommends using name zoning and creating single-initiator, multiple-target zones.
2.2.1.1 Identify host FC WWNs
When creating a host object on the ME4 Series array, the host FC WWNs are required. Use the following
procedure to identify the HBA WWNs on the Linux host. The fcshow.sh bash shell script is provided as an
example to extract useful information about the host HBA information.
# cat fcshow.sh
printf "%-10s %-20s %-10s %-s\n" "Host-Port" "WWN" "State" "Speed"
printf "%50s\n" |tr ' ' -
ls -1d /sys/class/fc_host/host* | while read host
do
(echo ${host##*/}: ; cat $host/port_name $host/port_state $host/speed)| xargs
-n 5 printf "%-10s %-20s %-10s %s %s\n"
done
# bash fcshow.sh
Host-Port WWN State Speed
--------------------------------------------------
host14: 0x2001000e1ec2ada0 Online 16 Gbit
host15: 0x2001000e1ec2ada1 Online 16 Gbit
host16: 0x2001000e1ec2d342 Online 16 Gbit
host17: 0x2001000e1ec2d343 Online 16 Gbit
host18: 0x2001000e1e09b7b8 Online 16 Gbit
host19: 0x2001000e1e09b7b9 Online 16 Gbit