Hi,
I've gotten failover and failback working, however, I'm not sure if the
amount of wait time for the failover is reasonable. I'm using QLogic
2340 cards and an EVA8000. I'm curious if anyone else using something
similar is seeing in terms of failover times.
When things are running as I'd expect I'm seeing just a few seconds
before the new path is up. When things seem wrong it's waiting and
queueing for as much as 1.5 minutes.
What should I be expecting?
My multipath.conf looks like this:
defaults {
user_friendly_names yes
multipath_tool "/sbin/multipath -v0"
udev_dir /dev
polling_interval 10
default_selector "round-robin 0"
default_path_grouping_policy failover
default_getuid_callout "/sbin/scsi_id -g -u -s /block/%
n"
default_prio_callout "/bin/true"
default_features "0"
rr_min_io 100
failback immediate
}
devnode_blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z]"
devnode "^cciss!c[0-9]d[0-9]*"
}
multipaths {
multipath {
wwid
3600508b40010764b0000b00003630000
alias "lun1"
path_grouping_policy failover
path_checker readsector0
path_selector "round-robin 0"
failback 20
rr_weight priorities
no_path_retry queue
}
multipath {
wwid
3600508b40010764b0000b00003660000
alias "lun2"
path_grouping_policy failover
path_checker readsector0
path_selector "round-robin 0"
failback 20
rr_weight priorities
no_path_retry queue
}
multipath {
wwid
3600508b40010764b0000b000036b0000
alias "lun3"
path_grouping_policy failover
path_checker readsector0
path_selector "round-robin 0"
failback 20
rr_weight priorities
no_path_retry queue
}
multipath {
wwid
3600508b40010764b0000b000036e0000
alias "lun4"
path_grouping_policy failover
path_checker readsector0
path_selector "round-robin 0"
failback 20
rr_weight priorities
no_path_retry queue
}
}
devices {
device {
# vendor "HP "
# product "HSV210 "
vendor "HP*"
product "HSV210*"
path_grouping_policy group_by_prio
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "/sbin/mpath_prio_alua %d"
failback immediate
no_path_retry 60
}
}
Thanks,
-sv
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