Dell PowerStore 5200T EMC PowerStore Host Configuration Guide - Page 65

Multipathing Software Configuration, Pre-Requisites, Configuration with Device Mapper Multipathing

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To apply the adjusted iscsid.conf settings, run the following command on the Linux host: systemctl restart iscsi NOTE: If a previous iSCSI target is discovered on the Linux host, delete the iSCSI database and rerun the iSCSI target discovery procedure with the iscsid.conf settings that are described above. Multipathing Software Configuration Pre-Requisites Steps 1. Verify that DM-MPIO is installed: $ rpm -qa | grep device-mapper-multipath 2. If not installed, install Device Mapper: $ dnf install device-mapper-multipath 3. Verify that Device Mapper is enabled: $ systemctl enable --now multipathd.service Configuration with Device Mapper Multipathing for SCSI 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 information, See the Importing External Storage to PowerStore Guide. NOTE: To resolve a known issue described in RedHat Knowledge Article 6298681 (multipathd crashes when...), it is highly recommended to update the device-mapper-multipath package to version 0.4.9-135.el7_9 (or later). ## Use user friendly names, instead of using WWIDs as names. defaults { user_friendly_names yes disable_changed_wwids yes } 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 fast_io_fail_tmo 15 max_sectors_kb 1024 ##only for RHEL 6.9 (or later 6.x versions) and RHEL 7.4 (or later) } Host Configuration for Linux 65

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To apply the adjusted iscsid.conf settings, run the following command on the Linux host:
systemctl restart iscsi
NOTE:
If a previous iSCSI target is discovered on the Linux host, delete the iSCSI database and rerun the iSCSI target
discovery procedure with the iscsid.conf settings that are described above.
Multipathing Software Configuration
Pre-Requisites
Steps
1.
Verify that DM-MPIO is installed:
$ rpm -qa | grep device-mapper-multipath
2.
If not installed, install Device Mapper:
$ dnf install device-mapper-multipath
3.
Verify that Device Mapper is enabled:
$ systemctl enable --now multipathd.service
Configuration with Device Mapper Multipathing for SCSI
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 information, See
the
Importing External Storage to PowerStore Guide
.
NOTE:
To resolve a known issue described in
RedHat Knowledge Article 6298681 (multipathd crashes when...)
, it is highly
recommended to update the
device-mapper-multipath
package to version 0.4.9-135.el7_9 (or later).
## Use user friendly names, instead of using WWIDs as names.
defaults {
user_friendly_names yes
disable_changed_wwids yes
}
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
fast_io_fail_tmo 15
max_sectors_kb 1024
##only for RHEL 6.9 (or later 6.x versions) and
RHEL 7.4 (or later)
}
Host Configuration for Linux
65