Hi,
I've been trying the new multipath configuration options in RHEL8 beta, the
options are listed in
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8-beta/html-single/8.0_beta_release_notes/index#file_systems_and_storage_2.
Below is my multipath configuration:
defaults {
user_friendly_names yes
find_multipaths yes
marginal_path_double_failed_time 120
marginal_path_err_sample_time 121
marginal_path_err_rate_threshold 10
marginal_path_err_recheck_gap_time 30
}
and this is the multipath storage:
3600124f0f822cba90003551f67355d000d dm-2 SUN,ZFS Storage 7120
size=100G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
`-+- policy='service-time 0' prio=50 status=active
|- 6:0:0:4 sdf 8:80 failed faulty running
|- 6:0:1:4 sdbv 68:144 failed faulty running
|- 8:0:0:4 sdab 65:176 active ready running
`- 8:0:1:4 sdcy 70:96 active ready running
To do the test, I use dd to write to the storage and use "iostat 1" to check
IO, then log onto the fc switch to disable a port, after port being disabled,
two paths will fail, and IO is only seen on the remaining two paths, then I
immediately re-enable the port, and IO will again be seen on all 4 paths, and
then I do this path disable and re-enable all over again, but no matter how
fast I do this again and again, after re-enabling the fc switch port, the
failed paths will always go online again after port re-enable and IO are seen
on them. According to the manpage of multipath.conf: "when a path failed event
occurs twice in marginal_path_double_failed_time seconds due to an IO error and
all the other three parameters are set, multipathd will fail the path and
enqueue this path into a queue...". Did I get anything wrong?
Thanks!
Regards,
Khitai
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