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25 Dell EMC SC Series: Red Hat Enterprise Linux Best Practices | CML1031
multipath {
wwid "36000d310000067000000000000000a68"
alias boot-vol
uid 0
gid 0
mode 0600
}
multipath {
wwid "36000d3100000650000000000000017f2"
alias appdata_001
uid 0
gid 0
mode 0600
}
}
Note: round-robin 0 is the default for RHEL 6 and older. service-time 0 is the default for RHEL 7 and newer.
Both are acceptable values for SC Series FC/iSCSI volumes.
Once the configuration file is in place, reload multipathd with the updated configuration.
# multipath -r
# multipath –ll
3.6.5 SAS volume multipath configuration
SAS connectivity to a Linux system requires a specific configuration schema in the /etc/multipath.conf file.
Add the following device section to /etc/multipath.conf used exclusively for SAS-connected Linux systems.
The following example defines the configuration parameters for all devices identified by
vendor="COMPELNT" and product="Compellent Vol".
devices {
device {
vendor COMPELNT
product "Compellent Vol"
path_checker tur
prio alua
path_selector "service-time 0"
path_grouping_policy group_by_prio
no_path_retry 24
hardware_handler "1 alua"
failback immediate
rr_weight priorities
}
}