SUSE_Linux_Enterprise_Server_15_x_for_SAP_Applications_Configuration_Guide_for_SAP_HANA_en

rr_min_io_rq 1
max_fds "max"
rr_weight "uniform"
queue_without_daemon "no"
flush_on_last_del "no"
# when using aliases instead wwpn set user_friendly_names to yes and
add list of wwpn aliases into multipath.conf
user_friendly_names "no"
fast_io_fail_tmo 5
bindings_file "/etc/multipath/bindings"
wwids_file /etc/multipath/wwids
log_checker_err always
retain_attached_hw_handler no
detect_prio no
force_sync no
strict_timing no
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^(td|hd)[a-z]"
devnode "^dcssblk[0-9]*"
devnode "^nvme.*"
device {
vendor "IBM"
product "Universal Xport"
}
device {
vendor "(NETAPP|LSI|ENGENIO)"
product "Universal Xport"
}
}
blacklist_exceptions {
property "(SCSI_IDENT_.*|ID_WWN)"
}
device {
#IBM Spectrum Virtualize (SVC)
##########################
vendor
"IBM"
product "2145"
path_grouping_policy "group_by_prio"
prio
"alua"
path_checker
"tur"
failback
"immediate"
#no queueing especially for scale-out Auto Host Failover
environments enable no_path_retry = fail to not hinder the take over
no_path_retry
"fail"
#bigger values rr_min_io_rq >32 can improve throughput, at
the same time deeper queues have a bigger impakt on failure recovery. in this
case also consider to increas:
# Increase the queue depth of devices/(e.g. echo 64 >
cat /sys/bus/scsi/devices/<device>/queue_depth)
# Increase /sys/block/<device>/queue/nr_requests if the
default (128) results in blocked I/O submission. This will indirectly help to
optimize the blocking inside SAP HANA.
rr_min_io_rq 16
#tmo values handle takover when paths/devices fail
fast_io_fail_tmo is related to dev_loss_tmo and queue_if_no_path
dev_loss_tmo 120
fast_io_fail_tmo 5
# service time 0 is latency optimization
path_selector "service-time 0"
}
}
●
After configuring the multipath, verify the bootlist. Show the existing bootlist:
bootlist -m normal -o
sdat
SUSE Linux Enterprise Server 15.x for SAP Applications Configuration Guide for SAP HANA
Sample Installation of SLES 15 for SAP Applications P U B L I C 39