Dell PowerStore 3000T EMC PowerStore Host Configuration Guide - Page 32

Disabling Reverse Path Filtering, Multipathing Software Configuration

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Disabling Reverse Path Filtering This topic outlines disabling reverse path filtering as a solution to the single network subnet limitation. RHEL 6 and above are configured by default to apply Strict Reverse Path Forwarding filtering recommended in RFC 3704 - Ingress Filtering for Multihomed Networks. NOTE: Before making this change, refer to the Root Cause section of this article to understand what it does and review alternative solutions as explained in https://access.redhat.com/solutions/53031. Setting the Reverse Path Filtering to 2 (loose) on the relevant network interfaces makes them both accessible and routable. To apply this change, add the following lines to /etc/sysctl.conf: net.ipv4.conf.eth2.rp_filter = 2 net.ipv4.conf.eth3.rp_filter = 2 NOTE: In this example, eth2 and eth3 are the network interfaces used for iSCSI. Make sure to modify to the relevant interfaces. To reload the configuration: sysctl -p To view the current Reverse Path Filtering configuration on the system: sysctl -ar "\.rp_filter" net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.eth0.rp_filter = 1 net.ipv4.conf.eth1.rp_filter = 1 net.ipv4.conf.eth2.rp_filter = 2 net.ipv4.conf.eth3.rp_filter = 2 net.ipv4.conf.lo.rp_filter = 0 Multipathing Software Configuration Configuring Linux Native Multipathing For a PowerStore cluster to function properly with Linux hosts, configure the multipath settings file /etc/multipath.conf: NOTE: If the host is connected to a cluster other than PowerStore, the configuration file may include additional devices. NOTE: If the multipath.conf file includes a blacklist section, it should come before the devices section. For additional information, refer to the Importing External Storage to PowerStore Guide document. devices { device { vendor DellEMC product PowerStore path_selector "queue-length 0" path_grouping_policy group_by_prio path_checker tur detect_prio yes failback immediate no_path_retry 3 rr_min_io_rq 1 32 Host Configuration for Linux

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Disabling Reverse Path Filtering
This topic outlines disabling reverse path filtering as a solution to the single network subnet limitation.
RHEL 6 and above are configured by default to apply Strict Reverse Path Forwarding filtering recommended in RFC 3704 - Ingress
Filtering for Multihomed Networks.
NOTE:
Before making this change, refer to the Root Cause section of this article to understand what it does and review
alternative solutions as explained in
.
Setting the Reverse Path Filtering to 2 (loose) on the relevant network interfaces makes them both accessible and routable.
To apply this change, add the following lines to
/etc/sysctl.conf
:
net.ipv4.conf.eth2.rp_filter = 2
net.ipv4.conf.eth3.rp_filter = 2
NOTE:
In this example,
eth2
and
eth3
are the network interfaces used for iSCSI. Make sure to modify to the relevant
interfaces.
To reload the configuration:
sysctl -p
To view the current Reverse Path Filtering configuration on the system:
sysctl -ar "\.rp_filter"
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.eth0.rp_filter = 1
net.ipv4.conf.eth1.rp_filter = 1
net.ipv4.conf.eth2.rp_filter = 2
net.ipv4.conf.eth3.rp_filter = 2
net.ipv4.conf.lo.rp_filter = 0
Multipathing Software Configuration
Configuring Linux Native Multipathing
For a PowerStore cluster to function properly with Linux hosts, configure the multipath settings file
/etc/multipath.conf
:
NOTE:
If the host is connected to a cluster other than PowerStore, the configuration file may include additional devices.
NOTE:
If the multipath.conf file includes a blacklist section, it should come before the devices section. For additional
information, refer to the
Importing External Storage to PowerStore Guide
document.
devices {
device
{
vendor DellEMC
product PowerStore
path_selector "queue-length 0"
path_grouping_policy group_by_prio
path_checker tur
detect_prio yes
failback immediate
no_path_retry 3
rr_min_io_rq 1
32
Host Configuration for Linux